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Table 20-1. Core permissions Type Enables SecurityPermission Advanced operations, such as calling unmanaged code ReflectionPermission Use of reflection EnvironmentPermission Reading/writing command-line environment settings RegistryPermission Reading or writing to the Windows Registry SecurityPermission accepts a SecurityPermissionFlag argument. This is an enum that allows any combination of the following: AllFlags ControlThread Assertion Execution BindingRedirects Infrastructure ControlAppDomain NoFlags ControlDomainPolicy RemotingConfiguration ControlEvidence SerializationFormatter ControlPolicy SkipVerification ControlPrincipal UnmanagedCode The most significant member of this enum is Execution, without which code will not run. The other members should be granted only in full-trust scenarios, because they enable a grantee to compromise or escape a sandbox. ControlAppDomain allows the creation of new application domains (see Chapter 24); UnmanagedCode allows you to call native methods (see Chapter 25). ReflectionPermission accepts a ReflectionPermissionFlag enum, which includes the members MemberAccess and RestrictedMemberAccess. If you’re sandboxing assemblies, the latter is safer to grant while permitting reflection scenarios required by APIs such as LINQ to SQL. Table 20-2. I/O and data permissions Type Enables FileIOPermission Reading/writing files and directories FileDialogPermission Reading/writing to a file chosen through an Open or Save dialog IsolatedStorageFilePermission Reading/writing to own isolated storage ConfigurationPermission Reading of application configuration files SqlClientPermission, OleDbPermission, OdbcPermission Communicating with a database server using the SqlClient, OleDb, or Odbc class DistributedTransactionPermission Participation in distributed transactions FileDialogPermission controls access to the OpenFileDialog and SaveFileDialog classes. These classes are defined in Microsoft.Win32 (for use in WPF applications) and in System.Windows.Forms (for use in Windows Forms applications). For this to work, UIPermission is also required. FileIOPermission is not also required, however, 756 | Chapter 20: Security
if you access the chosen file by calling OpenFile on the OpenFileDialog or SaveFileDialog objects. Table 20-3. Networking permissions Type Enables DnsPermission DNS lookup WebPermission WebRequest-based network access SocketPermission Socket-based network access SmtpPermission Sending mail through the SMTP libraries NetworkInformationPermission Use of classes such as Ping and NetworkInterface Table 20-4. Encryption permissions Type Enables DataProtectionPermission Use of the Windows data protection methods KeyContainerPermission Public key encryption and signing StorePermission Access to X.509 certificate stores Table 20-5. UI permissions Type Enables UIPermission Creating windows and interacting with the clipboard WebBrowserPermission Use of the WebBrowser control MediaPermission Image, audio, and video support in WPF PrintingPermission Accessing a printer Table 20-6. Diagnostics permissions Type Enables EventLogPermission Reading or writing to the Windows event log PerformanceCounterPermission Use of Windows performance counters Demands for these permission types are enforced within the .NET Framework. There are also some permission classes for which the intention is that Demands are enforced in your own code. The most important of these are concerned with establishing identity of the calling assembly, and are listed in Table 20-7. The caveat is that (as with all CAS permissions) a Demand always succeeds if the application domain is running in full trust (see the following section). Table 20-7. Identity permissions Type Enforces GacIdentityPermission The assembly is loaded into the GAC StrongNameIdentityPermission The calling assembly has a particular strong name Code Access Security (CAS) | 757 Security
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C# 4.0 www.free-ebooks-library.com
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C# 4.0 in a Nutshell, Fourth Editio
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Structs 89 Access Modifiers 90 Inte
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Annotations 440 Projecting into an
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Emitting Generic Methods and Types
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Groups 985 Replacing and Splitting
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If you’re already familiar with C
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This icon signifies a tip, suggesti
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I have the highest praise for Jon S
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Properties, methods, and events In
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Figure 1-1. This depicts the topics
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object o1 = "foo.doc"; object o2 =
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The first statement computes the ex
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The name of the C# compiler is csc.
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With contextual keywords, ambiguity
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Custom Type Examples Just as we can
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} } The public keyword The public k
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Figure 2-2. Assignment copies a val
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Technically, the CLR positions fiel
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Numeric literal type inference By d
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+ Addition − Subtraction * Multip
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In this case, x and y are implicitl
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which breaks equality and compariso
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Strings and Characters C#’s char
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Arrays An array represents a fixed
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int[,] matrix = new int[,] { {0,1,2
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Variables and Parameters A variable
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The following code outputs 0, becau
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static void Foo (ref int p) { p = p
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for (int i = 0; i < ints.Length; i+
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var—Implicitly Typed Local Variab
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Operator Precedence and Associativi
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Category Operator symbol Operator n
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Expression statements x = 1 + 2; //
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The switch statement switch stateme
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For example, the following prints t
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The return statement The return sta
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Rules Within a Namespace Name scopi
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namespace N2 { class Class3 : Class
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The :: token is used for namespace
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Fields allow the following modifier
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Overloading constructors A class or
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Object Initializers Versus Optional
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Properties allow the following modi
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Here’s how we could use this inde
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If a static constructor throws an u
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In addition, each participant can i
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Casting and Reference Conversions A
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public class Asset { public string
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Overrider over = new Overrider(); B
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Constructor and field initializatio
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Boxing and Unboxing Boxing is the a
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The ToString Method The ToString me
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Changing struct to class makes this
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Interfaces An interface is similar
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type that implements ISerializable
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public class RichTextBox : TextBox
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Center } A translation between the
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Unfortunately, Enum.IsDefined does
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Generic Types C# generics and C++ t
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static void Swap (ref T a, ref T b)
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Generic Constraints By default, a t
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Self-Referencing Generic Declaratio
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Classes Covariance and contravarian
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The IEnumerator and IEnumerable int
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The reason is that Max needs to be
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Technically, we are specifying a me
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Multicast delegate example Suppose
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The Func and Action Delegates With
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The following, however, is permitte
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Events When using delegates, two em
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public class PriceChangedEventArgs
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if (price == value) return; OnPrice
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Here is an example that illustrates
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Capturing Outer Variables A lambda
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Anonymous Methods Anonymous methods
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OUTPUT: x cannot be zero program co
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• The try block finishes normally
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The other common scenario is to ret
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indeterminate state that is the res
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class Enumerable // Typically imple
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Iterator Semantics An iterator is a
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yield return prevFib; int newFib =
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object o = "string"; int? x = o as
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Console.WriteLine (n | f); // (null
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== != > < >=
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Note n = (Note)554.37; // explicit
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Extension Method Chaining Extension
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static void Main() { string[] strin
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Now let’s change the static type
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Dynamic binding also incurs a perfo
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The static type of a variable decla
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The call to Foo(o,d) is dynamically
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parameters. The following attribute
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Value types declared inline within
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} } Pointers to Unmanaged Code Poin
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Compiler warnings can be extremely
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... Indicates a multiline code sam
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M:NS.MyClass.Z(System.Char[ ],Syste
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Table 5-1. C#, CLR, and .NET Framew
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Text Processing The System.Text nam
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this metadata at runtime, and do su
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infrastructure. Web Forms has been
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Provider layer The provider model d
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Remoting and Web Services Remoting
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ecause in Turkey, char.ToUpper ('i'
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string empty = ""; Console.WriteLin
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The static Join method does the rev
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order—but even then not exactly a
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The following performs a case-insen
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UTF-32 is the least space-efficient
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Two-word characters are called surr
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An excellent article on the rationa
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You can also construct a DateTime w
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The Add method adds a TimeSpan to a
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You can construct a DateTime that d
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source and destination TimeZoneInfo
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Western Australia is actually uniqu
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ToString and Parse The simplest for
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The next example formats a DateTime
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The following custom format provide
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Letter Meaning Sample input Result
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Figure 6-1. Composite NumberStyles
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The format strings "r", "R", and "u
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Other Conversion Mechanisms In the
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XmlConvert If you’re dealing with
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The .NET Framework helps you with t
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The Round method lets you specify t
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If you don’t want reproducibility
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static object GetBoxedIntegralValue
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Tuples Framework 4.0 provides a new
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Value Versus Referential Equality T
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Why the Complexity? You might wonde
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The IEquatable interface A conseque
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How to override equality semantics
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Implementing IEquatable For complet
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The .NET Framework also provides pl
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if (Equals (other)) return 0; // Fa
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Environment The static System.Envir
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7 Collections The .NET Framework pr
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By defining a single method retunin
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You can also subclass an existing c
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{ get { if (currentIndex == −1) t
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The ICollection and IList Interface
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IList and IList IList is the standa
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Because Array is a class, arrays ar
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void WriteFirstValue (Array a) { Co
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public static int FindIndex (T[] ar
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The Comparison delegate follows the
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List and ArrayList The generic List
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Such casts cannot be verified by th
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Here’s a demonstration on the use
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public sealed class BitArray : ICol
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public virtual SortedSet GetViewBet
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IDictionary IDictionary defines the
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Its underlying hashtable works by c
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var sorted = new SortedList (); for
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public class Animal { public string
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A keyed collection has some resembl
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clumsy hook methods like Collection
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Recall the requirements of a hashta
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IComparer and Comparer Comparers ar
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{ public abstract int Compare (stri
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8 LINQ Queries LINQ, or Language In
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We could further shorten our code b
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We already introduced the Where ope
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output sequence. In the case of the
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Natural Ordering The original order
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Figure 8-2. Query syntax The compil
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With LINQ, data logically flows fro
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Reevaluation Subqueries provide ano
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How Deferred Execution Works Query
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Adding ToList onto the end of this
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The term subquery, in the general s
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Figure 8-8. UML subquery compositio
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select n.Replace ("a", "").Replace
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(The compiler does not emit the fin
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where vowelless.Length > 2 orderby
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IQueryable query = from c in custom
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To work, LINQ to SQL needs some clu
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Figure 8-10. Combining local and in
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LINQ to SQL Versus Entity Framework
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Unlike with L2S, however, a class s
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The Single operator is ideal for re
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You can disable this behavior in L2
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With EF: [EdmRelationshipNavigation
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• It lets you request that certai
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context.SubmitChanges(); // Updates
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Purpose LINQ to SQL Entity Framewor
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void Test() { var dataContext = new
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Figure 8-12. Expression tree We can
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9 LINQ Operators This chapter descr
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Overview In this section, we provid
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Picks a single element from a seque
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In query syntax: IEnumerable query
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TakeWhile enumerates the input sequ
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IEnumerable query = names .Select (
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This is slightly untidy, however, i
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element is the trigger for the intr
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Thinking in query syntax As we just
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from c in dataContext.Customers fro
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Joining If you’re used to writing
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To see the benefit of Join over Sel
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GroupJoin GroupJoin does the same w
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You can create and query lookups ma
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OrderBy, OrderByDescending, ThenBy,
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var query = names.OrderBy (s => s.L
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from file in files group file.ToUpp
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In the next example, we filter the
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public static IEnumerable Cast (IE
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Method Description SQL equivalents
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Count simply enumerates over a sequ
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The first argument to Aggregate is
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Quantifiers IEnumerable→bool Meth
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10 LINQ to XML The .NET Framework p
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Figure 10-1. Core X-DOM types Figur
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XElement client = config.Element ("
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); new XElement ("lastname", c.Last
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Child Node Navigation Return type M
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The first call to Elements binds to
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Return type Members Defined in IEnu
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The ReplaceXXX methods are equivale
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Setting Values There are two ways t
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var e1 = new XElement ("test", "Hel
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Console.WriteLine (doc.Root.Parent
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XML file into another. Second, name
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Specifying Namespaces in the X-DOM
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foreach (XElement e in data.Descend
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A public type such as string doesn
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know about IQueryable, so it forces
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ObjectGraph.cs Program.cs Propertie
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11 Other XML Technologies The Syste
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Reading Nodes The units of an XML s
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Element----------> quote CDATA-----
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eader.ReadStartElement ("customerLi
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The XmlReader must be positioned on
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XmlWriter XmlWriter is a forward-on
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Patterns for Using XmlReader/XmlWri
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if (isEmpty) return; // element! w
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using (XmlWriter w = XmlWriter.Crea
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Setting the InnerText property repl
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XPath queries are expressed in term
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The [] operator filters a selection
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OUTPUT: Jim Thomas XSD and Schema V
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settings.ValidationEventHandler +=
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12 Disposal and Garbage Collection
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These rules are also helpful when w
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The idea is that a consumer of this
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public void Test() { byte[] myArray
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Figure 12-1. Roots deleted right aw
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objects with finalizers (because su
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public class TempFileRef { public r
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Figure 12-2. Heap generations The l
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dynamically tweaks the thresholds f
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Timers Forgotten timers can also ca
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var sb = new StringBuilder ("this i
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public TDelegate Target { get { var
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13 Diagnostics and Code Contracts W
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MyCompany.Widgets.Gadget; #endif Yo
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Both the Debug and Trace classes pr
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EventLog.CreateEventSource ("DemoAp
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if (list.Contains(item)) return fal
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The binary rewriter After compiling
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Preconditions should access only me
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• It’s time-consuming. • Call
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The binary rewriter moves postcondi
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For the reason just stated, postcon
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A special mechanism lets specify a
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Handling this event is particularly
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3. In the debug configuration of th
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Attaching and Breaking The static D
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If you instantiate a StackTrace obj
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2. Decide on a source name and crea
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The following sections illustrate h
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{ if (!PerformanceCounterCategory.E
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If you later want to define more co
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Figure 14-1. Stream architecture St
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In the following example, we use a
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Seeking A stream is seekable if Can
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OpenWrite and Create differ in beha
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[Flags] public enum FileAccess { Re
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Pipes are stream-based, so one proc
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Console.WriteLine (Encoding.UTF8.Ge
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Console.WriteLine (fs.Position); //
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is passed in (optionally through an
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using (TextWriter w = File.CreateTe
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public void SaveData (Stream s) { v
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The File Class File is a static cla
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using System.Runtime.InteropService
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FileInfo offers most of the File’
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Special Folders You must delete the
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watcher.Created += FileCreatedChang
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Memory-Mapped Files and Shared Memo
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using (TextWriter w = new StreamWri
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Isolation Types Isolated storage ca
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IsolatedStorageFile is poorly named
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s.WriteByte (100); f.DeleteFile (@"
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Figure 15-1. Network architecture I
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IPAddress a3 = IPAddress.Parse ("[3
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Uri u = new Uri ("page.html", UriKi
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2. Assign the Proxy property. 3. As
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If you don’t have a proxy, you mu
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Windows protocol that boils down to
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2. Examine the response object’s
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System.IO.File.WriteAllBytes ("Sear
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you greater privileges in browsing
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In this example, we sleep for 500 m
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without needing more threads—by f
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Using DNS In all these examples, yo
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Using TCP TCP and UDP constitute th
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Hello Hello right back! In this exa
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In this example, we write each mail
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Serialization Engines There are fou
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an arbitrary XML structure. For ins
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It requires, however, that you expl
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Specifying a name and namespace dec
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The solution is to specify all perm
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we would see the same address detai
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Null and Empty Values There are two
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Subclassed Collection Elements The
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[DataMember (Name="Addresses")] Ser
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The following example illustrates a
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The two formatters are otherwise ex
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[OnSerializing] and [OnSerialized]
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Binary Serialization with ISerializ
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Subclassing Serializable Classes In
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XmlSerializer xs = new XmlSerialize
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and you write a reusable method to
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If, on the other hand, you want the
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instead add [XmlElement] to the col
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public void WriteXml (XmlWriter wri
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Assemblies are structured similarly
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To embed an application manifest fi
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Table 17-1. Assembly members Functi
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Delay Signing In an organization wi
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If the assembly has no AssemblyVers
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Figure 17-3. Unsigned file warning
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Signing with signtool.exe You can A
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• Updating assemblies in the GAC
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.mresource public banner.jpg { // O
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GetManifestResourceNames returns th
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(The first argument must be namespa
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We then retrieved the greeting at r
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where to look. You (or Visual Studi
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Loading from a filename You can see
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if (!File.Exists (path)) return nul
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for the presence of a library in it
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18 Reflection and Metadata As we sa
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Obtaining array types As we just sa
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Base Types and Interfaces Type expo
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Console.WriteLine (staticD.DynamicI
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When calling GetMembers, you can pa
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C# construct Method to use Name to
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Console.WriteLine (unbound.Property
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from m in typeof (Enumerable).GetMe
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The following example retrieves all
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There’s no nongeneric type we can
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Modules Calling GetTypes on a multi
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The AttributeUsage Attribute Attrib
Page 725 and 726: Retrieving Attributes at Runtime Th
Page 727 and 728: AppDomain.CurrentDomain.ReflectionO
Page 729 and 730: gen.Emit (OpCodes.Ldc_I4, 123); //
Page 731 and 732: gen.Emit (OpCodes.Mul); // Multiply
Page 733 and 734: Type[] strT = { typeof (string) };
Page 735 and 736: The DefineType method also accepts
Page 737 and 738: We could just as easily call a dyna
Page 739 and 740: mb.DefineParameter (1, ParameterAtt
Page 741 and 742: ILGenerator setGen = setter.GetILGe
Page 743 and 744: myFieldBuilder.SetCustomAttribute (
Page 745 and 746: Awkward Emission Targets All the ex
Page 747 and 748: and object references. In creating
Page 749 and 750: Here is a sample of the output our
Page 751 and 752: The next step is to call FormatOper
Page 753: The point where we call ResolveMemb
Page 756 and 757: trees (the same expression trees in
Page 758 and 759: yte b = 3; Console.WriteLine ((b +
Page 760 and 761: DynamicVisit on each person in the
Page 762 and 763: Anonymously Calling Members of a Ge
Page 764 and 765: Notice that we used dynamic member
Page 766 and 767: The following does a similar thing
Page 768 and 769: In the following example, we use Ir
Page 771 and 772: In this chapter, we discuss the two
Page 773 and 774: Framework 4.0 deprecates support fo
Page 775: When you call AddPermission, the pe
Page 779 and 780: Elevation of Privilege Let’s supp
Page 781 and 782: The Transparency Model in CLR 4.0 T
Page 783 and 784: Figure 20-1. Transparency model; on
Page 785 and 786: GC.AddMemoryPressure (1000000); //
Page 787 and 788: stack, the WindowFromPoint method w
Page 789 and 790: string dir = Path.Combine (System.R
Page 791 and 792: The first step in doing this is to
Page 793 and 794: A feature called User Access Contro
Page 795 and 796: If you replace requireAdministrator
Page 797 and 798: Table 20-8. Encryption and hashing
Page 799 and 800: The GetBytes method on an Encoding
Page 801 and 802: As well as a key, we made up an IV,
Page 803 and 804: w.WriteLine ("Small and secure!");
Page 805 and 806: pairs. A key pair contains a public
Page 807 and 808: using (var rsaPublicPrivate = new R
Page 809 and 810: C# allows you to execute code in pa
Page 811 and 812: Getting Started A client program (C
Page 813 and 814: Thread.Sleep(0) relinquishes the th
Page 815 and 816: string text = "t1"; Thread t1 = new
Page 817 and 818: If this program is called with no a
Page 819 and 820: The try/catch statement in this exa
Page 821 and 822: There are a few things to be wary o
Page 823 and 824: static void Main() { ThreadPool.Que
Page 825 and 826: we’re using it to pass the method
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Fortunately, the pool manager has a
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class ThreadUnsafe { static int _va
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As with the Enter method, it’s ov
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Instruction atomicity is a differen
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BeginInvoke instead of Invoke. Alte
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static void Main() { for (int i = 1
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class ThreadSafe { static List _li
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In the absence of documentation, it
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The code is similar for Windows For
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It’s also possible to safely assi
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The following implicitly generate f
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As it happens, Intel’s X86 and X6
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Exchange and CompareExchange method
Page 853 and 854:
former two are based on the common
Page 855 and 856:
Two-way signaling Let’s say we wa
Page 857 and 858:
Signaling Constructs and Performanc
Page 859 and 860:
Signaling worker... Started - Some
Page 861 and 862:
and the lock statement, you can ach
Page 863 and 864:
This means that despite appearances
Page 865 and 866:
using System; using System.Threadin
Page 867 and 868:
We don’t pulse after dequeuing, a
Page 869 and 870:
Use of PulseAll would forgo fairnes
Page 871 and 872:
The Event-Based Asynchronous Patter
Page 873 and 874:
class Program { static BackgroundWo
Page 875 and 876:
Reached 20% Reached 40% Reached 60%
Page 877 and 878:
For a discussion as to why aborting
Page 879 and 880:
Cancellation Tokens Framework 4.0 p
Page 881 and 882:
if (_expensive == null) _expensive
Page 883 and 884:
you want to keep data isolated, ens
Page 885 and 886:
from under their feet, as long as t
Page 887 and 888:
Here’s the result: Thread B added
Page 889 and 890:
var rw = new ReaderWriterLockSlim()
Page 891 and 892:
class SystemTimer { static void Mai
Page 893 and 894:
22 Parallel Programming In this cha
Page 895 and 896:
Data parallelism is also conducive
Page 897 and 898:
the code that must execute sequenti
Page 899 and 900:
Why Isn’t AsParallel the Default?
Page 901 and 902:
Most query operators change the ind
Page 903 and 904:
.Select (i => wordList [localRandom
Page 905 and 906:
class Camera { public readonly int
Page 907 and 908:
foreach (int n in parallelQuery) Do
Page 909 and 910:
Figure 22-4. Chunk versus range par
Page 911 and 912:
string text = "Let's suppose this i
Page 913 and 914:
public static void Invoke (Parallel
Page 915 and 916:
var random = new Random(); string[]
Page 917 and 918:
public static ParallelLoopResult Fo
Page 919 and 920:
• Wait on a set of tasks—withou
Page 921 and 922:
The task queuing problem arises bec
Page 923 and 924:
TaskCreationOptions atp = TaskCreat
Page 925 and 926:
As soon as task1 (the antecedent) f
Page 927 and 928:
Conditional continuations By defaul
Page 929 and 930:
This writes “Done” after writin
Page 931 and 932:
var factory = new TaskFactory ( Tas
Page 933 and 934:
Flatten and Handle Both PLINQ and t
Page 935 and 936:
• The concurrent stack, queue, an
Page 937 and 938:
Concurrent bags are ideal when the
Page 939 and 940:
public class PCQueue : IDisposable
Page 941 and 942:
If you leave a spinlock contended f
Page 943 and 944:
How to use SpinWait There are two w
Page 945:
spinWait.SpinOnce(); } } Here’s h
Page 948 and 949:
If you don’t need such concurrenc
Page 950 and 951:
• The underlying implementation
Page 952 and 953:
public class Server { public void S
Page 954 and 955:
void Read() { _stream.BeginRead (_d
Page 956 and 957:
_stream = c.GetStream(); var task =
Page 958 and 959:
exception is encountered, it’s no
Page 960 and 961:
When writing asynchronous methods,
Page 963 and 964:
24 Application Domains An applicati
Page 965 and 966:
Creating and Destroying Application
Page 967 and 968:
When additional application domains
Page 969 and 970:
static void Main() { AppDomain newD
Page 971 and 972:
class Client { // Here's a static f
Page 973 and 974:
it appears as though it was a direc
Page 975 and 976:
namespace Plugin.Extensions { publi
Page 977 and 978:
25 Native and COM Interoperability
Page 979 and 980:
class Test { [DllImport("kernel32.d
Page 981 and 982:
StringBuilder class require copying
Page 983 and 984:
Shared Memory Memory-mapped files,
Page 985 and 986:
The second application subscribes t
Page 987 and 988:
If you’re targeting Framework 4.0
Page 989 and 990:
With the first use of the fixed key
Page 991 and 992:
The root interface in COM is IUnkno
Page 993 and 994:
workBook.SaveAs (@"c:\test.xlsx", P
Page 995 and 996:
Embedding Interop Types We said pre
Page 997 and 998:
26 Regular Expressions The regular
Page 999 and 1000:
Regex r = new Regex (@"sausages?");
Page 1001 and 1002:
Character Sets Character sets act a
Page 1003 and 1004:
The problem is that our * quantifie
Page 1005 and 1006:
The positive lookahead ensures that
Page 1007 and 1008:
The following example matches a sim
Page 1009 and 1010:
Extracting "name = value" pairs (on
Page 1011 and 1012:
Console.WriteLine (m.Groups ["tag"]
Page 1013 and 1014:
Expression Meaning Inverse (“not
Page 1015:
Table 26-11. Miscellaneous construc
Page 1018 and 1019:
catch A keyword for the clause in a
Page 1020 and 1021:
goto A jump statement that jumps to
Page 1022 and 1023:
ef A parameter and argument modifie
Page 1024 and 1025:
volatile A field modifier instructi
Page 1026 and 1027:
A with enums, 98 with nullable type
Page 1028 and 1029:
inary numbers (converting), 233 bin
Page 1030 and 1031:
COM type system, 970 IUnknown and I
Page 1032 and 1033:
time zones, 213-218 TimeSpan, 206 D
Page 1034 and 1035:
Array class, 277 enumerators, 143 I
Page 1036 and 1037:
formatting, 219-225 composite forma
Page 1038 and 1039:
IndexOf method, 196, 279 IndexOfAny
Page 1040 and 1041:
Count and LongCount, 407 Min and Ma
Page 1042 and 1043:
memory barriers and volatility, 825
Page 1044 and 1045:
PipeStream class, 547 anonymous pip
Page 1046 and 1047:
Remoting, 952 remove keyword, 124 R
Page 1048 and 1049:
two-word characters and, 206 String
Page 1050 and 1051:
DateTime and, 213 DateTimeOffset an
Page 1052 and 1053:
loading and parsing, 416 names and
Page 1055:
About the Authors Joe Albahari is t
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