Create custom events in c#

Create custom event in C# and handle them

Consider the following code.

public class FeedsManager

{

    public event Status onStatusChange;

    public delegate void Status(string StatusText, int StatusPercent);

public void someMethod(){

 ......

 ........

 if (onStatusChange!= null) onStatusChange("Starting...", 10);

 .......

 .......

 ........

 if (onStatusChange!= null) onStatusChange("Starting...", 10);

 .......

 }

.

.

.

//other methods...

}

1. Declare the event delegate 

public delegate void Status(string StatusText, int StatusPercent);

As in this case Status is the event type taking two arguments one of type string and other integer. you can provide a custom name to event and pass many arguments of different types.

2.  Now create the event

   public event Status onStatusChange;

Create an event of the type of delegate you have created , here the name of event is  onStatusChange.

3. Raising the event

if (onStatusChange!= null) onStatusChange("Starting...", 10);

first we have to check is an event handler is set, if yes then call the handler function and pass the desired arguments.

Note: you can raise a event as many time you want, but in the context of same class.

Creating the handlers for event.

  FeedsManager FM = new FeedsManager();

 FM.onStatusChange += new FeedsManager.Status(FM_onStatusChange);

        

 void FM_onStatusChange(string StatusText, int StatusPercent)

        {

       //do what ever you want

        }

Or alternatively you can create a handler function as

 FM.onStatusChange += (msg, per) => {

           //do whatever you want

       };

Hope it helps you some where 

happy coding.... :D