C # custom events

Custom
Event
It

Using system;

 

Delegate viod chareventhandler (Object sender, chareventargs E );

 

Custom parameters for triggering an event

Public class chareventargs eventargs

{

Public char currchar;

Public chareventargs (char currchar)

{

This. currchar = currchar;

}

}

 

Class charchecker

{

Char curr_char;

Public event chareventhandler chartest;

 

Public char curr_char

{

Get {return curr_char ;}

Set

{

If (chartest! = NULL)

{

Chareventargs myeven = new chareventargs (value );

Chartest (this, myeven); triggers the event here

Curr_char = myeven. currchar

}

}

}

}

 

Class appevent

{

Static void main ()

{

Charchecker chartester = new charchecker ();

Chartester. chartest + = new chareventhandler (change_x); when the chartest event is triggered, it is bound to the change_x function.

 

Chartester. curr_char = 'a'; run the Set Method of curr_char to trigger the event.

Console. writeline (event processing result: {0}, chartester. curr_char );

Chartester. curr_char = 'B ';

Console. writeline (event processing result: {0}, chartester. curr_char );

Chartester. curr_char = 'X ';

Console. writeline ({0}, chartester. curr_char );

Console. writeline ();

}

Static void change_x (Object source, chareventargs E)

{

If (E. currchar = 'X' E. currchar = 'X ')

{

Console. Write (the trigger character is X ,);

Console. Write (replace X :);

E. currchar = '';

}

Else

Console. Write (the trigger character is not X ,);

}

}

 

 

Running result:

The trigger character is not X. The event processing result is.

The trigger character is not X, and the event processing result is B.

The trigger character is X. Replace X :?