C#

George_George wrote:

I think using asyncState to transfer variable is useless as I can see from the sample, because we can wrap the asyncState into the 1st parameter of BeginInvoke method.

George_George wrote:

my question is in what situations does the 3rd parameter of BeginInvoke method have special function

AndieDu wrote:

are there any ways that i can generate these pieces of code by CodeDom:

private System.Drawing.Icon ImageToIcon(System.Drawing.Image image)
{
   return System.Drawing.Icon.FromHandle(((Bitmap)image).Get Hicon());
}

Bitmap bitmapImage = new Bitmap(textBoxImageSource.Text);
Bitmap bitmapIcon = new Bitmap(32, 32);
Graphics graphics = Graphics.FromImage(bitmapIcon);
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
/* dont bother the x,y,w,and h.. i used them to scale the image. */
graphics.DrawImage(bitmapImage, x, y, w, h);
graphics.Flush();

public sealed class MyClass: IDisposable
{
// Variable to track if Dispose has been called
private bool disposed = false;
// Implement the IDisposable.Dispose() method
public void Dispose(){
// Check if Dispose has already been called
if (!disposed)
{
// Call the overridden Dispose method that contains common cleanup code
// Pass true to indicate that it is called from Dispose
Dispose(true);
// Prevent subsequent finalization of this object. This is not needed
// because managed and unmanaged resources have been explicitly released
GC.SuppressFinalize(this);
}
}
// Implement a finalizer by using destructor style syntax
~MyClass() {
// Call the overridden Dispose method that contains common cleanup code
// Pass false to indicate the it is not called from Dispose
Dispose(false);
}
// Implement the override Dispose method that will contain common
// cleanup functionality
protected virtual void Dispose(bool disposing){
if(disposing){
// Dispose time code
. . .
}
// Finalize time code
. . .
}
...
}