static void Done(IAsyncResult cookie)
{
WorkInvoker method = (WorkInvoker)cookie.AsyncState; //info about asynch operation
int result = method.EndInvoke(cookie);
Console.WriteLine("String II length is: " + result);
}
/// <summary>
/// Implementation of the async work invoker
/// </summary>
/// <remarks>
/// We're using the delegate BeginInvoke() / EndInvoke() pattern here
/// </remarks>
protected override void BeginInvokeCore()
{
WorkInvoker worker = new WorkInvoker( DoWork );
worker.BeginInvoke(
_initializeCallback,
_progressCallback ,
_primaryStatusTextCallback ,
_secondaryStatusTextCallback,
new AsyncCallback( EndWork ), null );
}
/// <summary>
/// Implementation of the async work invoker
/// </summary>
/// <remarks>
/// We're using the delegate BeginInvoke() / EndInvoke() pattern here
/// </remarks>
protected override void BeginInvokeCore()
{
WorkInvoker worker = new WorkInvoker(DoWork);
worker.BeginInvoke(
_initializeCallback,
_progressCallback,
_primaryStatusTextCallback,
_secondaryStatusTextCallback,
new AsyncCallback(EndWork), null);
}
static void Main()
{
WorkInvoker method = Work;
// Start the delegate; control returned immediately to caller
// We also have the callback delegate 'Done' that is automatically called
// upon completion.
method.BeginInvoke("test", Done, method);
// Caller can carry on with other operations in *parallel* here
double d = 1.0;
Thread.Sleep(5000);
Console.WriteLine("Value {0}", d);
Console.ReadLine();
}
private void EndWork(IAsyncResult result)
{
AsyncResult asyncResult = (AsyncResult)result;
WorkInvoker asyncDelegate = (WorkInvoker)asyncResult.AsyncDelegate;
try
{
asyncDelegate.EndInvoke(result);
OnFinish(EventArgs.Empty);
}
catch (Exception e)
{
// Marshal exceptions back to the UI
OnError(new ErrorEventArgs(e));
}
// catch
// {
// // Do our exception handling; include a default catch
// // block because this is the final handler on the stack for this
// // thread, and we need to log these kinds of problems
// OnError( new ErrorEventArgs( null ) );
// }
}
