C# 4 and .NET 4

Creating a Windows forms application ❘ 1119
meThod/ProPerTy
MessageLoop
StartupPath
AddMessageFilter
DoEvents
EnableVisualStyles
Exit and ExitThread
desCriPTion
Returns true if a message loop exists on the current thread; false otherwise.
Similar to ExecutablePath, except that the filename is not returned.
Used to preprocess messages. By implementing an IMessageFilter-based
object, the messages can be filtered from the message loop, or special processing
can take place prior to the message being passed to the loop.
Similar to the Visual Basic DoEvents statement. Allows messages in the queue to
be processed.
Enables XP visual styles for the various visual elements of the application. There are
two overloads that will accept manifest information. One is a stream of the manifest,
and the other is the full name and path of the location where the manifest exists.
Exit ends all currently running message loops and exits the application.
ExitThread ends the message loop and closes all windows on the current thread.
Now, what does this sample application look like when it is generated in Visual Studio The first thing to
notice is that two files are created because Visual Studio takes advantage of the partial class feature of the
Framework and separates all of the Designer-generated code into a separate file. Using the default name of
Form1, the two files are Form1.cs and Form1.Designer.cs. (Unless you have the Show All Files option
checked on the Project menu, you won’t see Form1.Designer.cs in Solution Explorer.) Following is the
code that Visual Studio generates for the two files. First is Form1.cs:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace VisualStudioForm
{
public partial class Form1: Form
{
public Form1()
{
InitializeComponent();
}
}
}
code snippet Form1.cs
This is pretty simple, a handful of using statements and a simple constructor. Here is the code in Form1
.Designer.cs:
namespace VisualStudioForm
{
partial class Form1
{
///
/// Required designer variable.
///
private System.ComponentModel.IContainer components = null;
///
/// Clean up any resources being used.
///
/// true if managed resources
/// should be disposed; otherwise, false.
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