Wait IAsyncResult function until complete

Question

I need to create mechanism which waits IAsycnResult method till complete. How can i achieve this ?

IAsyncResult result = _contactGroupServices.BeginDeleteContact(
  contactToRemove.Uri,
  ar =>
      {
      try
         {
           _contactGroupServices.EndDeleteContact(ar);
         }
      catch (RealTimeException rtex)
         {
            Console.WriteLine(rtex);
         }
      },
      null ); 

Answer 1

I dont have any idea what is the goal of this method _contactGroupServices.BeginDeleteContact . But lets try to write template for it

Func<object> doWork = () =>
{
    return _contactGroupServices.BeginDeleteContact(<your parameters>)

};


AsyncCallback onWorkDone = (ar) =>
{
    //work done implementation
};

IAsyncResult asyncResult = doWork.BeginInvoke(onWorkDone, null); 

asyncResult.AsyncWaitHandle.WaitOne();

var result = doWork.EndInvoke(asyncResult);