Brief analysis of steps for C to use delegation

This article gives a brief analysis of the steps for C# to use delegation. Share to everybody for everybody reference. The specific analysis is as follows:

The delegate can be understood as C or C++ inside of the function pointer, calling the delegate is actually calling the delegate method.

The simple steps for using a delegate are as follows:

1. Define the delegate

//  Define the delegate to use the keyword  delegate

private delegate void SetProgressBarValueDelegate(int value);

2. State the delegate

private SetProgressBarValueDelegate setProgressBarValue;

3. Instantiate the delegate

setProgressBarValue = new SetProgressBarValueDelegate(SetProgressBarValue1);

SetProgressBarValue1 is the name of the method being delegated, and the parameter type is kept 1 to the type of the delegate. Its prototype is as follows:

//  Set the progress bar 1 value 

private void SetProgressBarValue1(int value)

{

    pgProgressBar1.Value = value;

}

4. Use the delegate:

SetProgressBarValueMethod(setProgressBarValue);
//  Set the progress bar value 

private void SetProgressBarValueMethod(SetProgressBarValueDelegate setProgressBarValueDelegate)

{

    for (int i = 1; i <= 100; i++)

    {

 Application.DoEvents();

 Thread.Sleep(50);

 setProgressBarValueDelegate(i);   

    }

}
/*  This command tells the system to proceed with other user interface events to avoid faking death 

 *  Is equivalent to  Visual Basic 6.0  the  DoEvents()

 *  Is equivalent to   Easy language   the   Handle events () */

 Application.DoEvents();

/*  This command is used for thread pauses (argument: milliseconds) 

 *  Used here in the main thread, this will cause a false death and pause just to get a better view  */
Thread.Sleep(50);

Hopefully this article has helped you with your C# programming.