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If the assembly has no AssemblyVersion attribute, the version appears as “0.0.0.0”.
If it is unsigned, its public key token appears as “null”.
An Assembly object’s FullName property returns its fully qualified name. The compiler
always uses fully qualified names when recording assembly references in the
manifest.
A fully qualified assembly name does not include a directory
path to assist in locating it on disk. Locating an assembly residing
in another directory is an entirely separate matter that we
pick up in “Resolving and Loading Assemblies” on page 671.
The AssemblyName Class
AssemblyName is a class with a typed property for each of the four components of a
fully qualified assembly name. AssemblyName has two purposes:
• It parses or builds a fully qualified assembly name.
• It stores some extra data to assist in resolving (finding) the assembly.
You can obtain an AssemblyName object in any of the following ways:
• Instantiate an AssemblyName, providing a fully qualified name.
• Call GetName on an existing Assembly.
• Call AssemblyName.GetAssemblyName, providing the path to an assembly file on
disk.
You can also instantiate an AssemblyName object without any arguments, and then
set each of its properties to build a fully qualified name. An AssemblyName is mutable
when constructed in this manner.
Here are its essential properties and methods:
string FullName { get; } // Fully qualified name
string Name { get; set; } // Simple name
Version Version { get; set; } // Assembly version
CultureInfo CultureInfo { get; set; } // For satellite assemblies
string CodeBase { get; set; } // Location
byte[] GetPublicKey(); // 160 bytes
void SetPublicKey (byte[] key);
byte[] GetPublicKeyToken(); // 8-byte version
void SetPublicKeyToken (byte[] publicKeyToken);
Version is itself a strongly typed representation, with properties for Major, Minor,
Build, and Revision numbers. GetPublicKey returns the full cryptographic public
key; GetPublicKeyToken returns the last eight bytes used in establishing identity.
To use AssemblyName to obtain the simple name of an assembly:
Console.WriteLine (typeof (string).Assembly.GetName().Name); // mscorlib
656 | Chapter 17: Assemblies