Question

Facing some problem calling methods in Silverlight.
Here’s the scenario :–

My service agent contains the method which is calling a method in WCF service. The way i am calling is this :

   public void GetMethod(EventHandler<GetMethodCompletedEventArgs> callback)
    {
        _Proxy.GetMethodCompleted += callback;
        _Proxy.GetMethodAsync();
    }

I am calling this method in the View Model like this

private void SomeMethod()
{
ServiceAgent.GetMethod(inputVariable, new EventHandler<GetMethodCompletedEventArgs>(OnGetMethod_Completed));
}

void OnGetMethod_Completed(GetMethodCompletedEventArgs e)
{
int result = e.Result;
}

I have attached the method in the view model to a button in the UI.

Now the problem is, if i press the button first time everything works fine, if i press it twice the OnGetMethod_Completed() gets executed 2 time for one button click(i.e. 2nd button click), when i press it the third time it get executed 3 times and so on…
I really don’t get it why this is happening, if anybody does then please help me out.

Thanks in advance

Answer 1

you need to unregister from the completed event on your OnGetMethod_Completed

void OnGetMethod_Completed(GetMethodCompletedEventArgs e)
{
  int result = e.Result;
  _Proxy.GetMethodCompleted  -= OnGetMethod_Completed
 }