C # simple steps for using Delegation

The delegate can be understood as the function pointer in C or C ++. Calling the delegate actually calls the delegate method.

The procedure for using delegation is as follows:

1. Define Delegation

// Define the delegate use keyword delegate
Private delegate void setprogressbarvaluedelegate (INT value );

2. Declare Delegation

Private setprogressbarvaluedelegate setprogressbarvalue;

3. instantiate the delegate

Setprogressbarvalue = new setprogressbarvaluedelegate (setprogressbarvalue1 );

Setprogressbarvalue1 is the name of the delegate method. The parameter type must be consistent with the delegate type. The prototype is as follows:

// Set progress bar 1
Private void setprogressbarvalue1 (INT value)
{
Pgprogressbar1.value = value;
}

4. Delegated use:

Setprogressbarvaluemethod (setprogressbarvalue );

// Set the progress bar value
Private void setprogressbarvaluemethod (setprogressbarvaluedelegate)
{
For (INT I = 1; I <= 100; I ++)
{
Application. doevents ();
Thread. Sleep (50 );
Setprogressbarvaluedelegate (I );
}
}

/* This Command tells the system to continue processing other events on the user interface to avoid false positives.
* Equivalent to Visual Basic 6.0 doevents ()
* Processing events () in easy language ()*/
Application. doevents ();
/* This command is used to suspend a thread (parameter: millisecond)
* If it is used in the main thread, it will lead to a false death. You can only pause it to make it clearer */

Thread. Sleep (50 );

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C # simple steps for using Delegation