// private void CalcCallback(IAsyncResult ar)
//{
// // Following line is used when this callback method can not acquire a handle of the delegate, mDeleg, for
// // example, when it is in another class. The AsyncDelegate property was generated by the compiler together
// // with the BeginInvoke and EndInvoke methods.
// // CalcDelegate mDeleg = (CalcDelegate)(ar.AsyncDelegate);
// string strResult = null;
// int iResult = mDeleg.EndInvoke(ref strResult, ar);
// tbResult.Text = Convert.ToString(iResult); // the third textbox
// tbMsg.Text = strResult; // the message textbox
// int i = (int)ar.AsyncState;
// MessageBox.Show("The ar.AsyncState is " + i); // will show 123456789
// }
private void Button_Click_1(object sender, RoutedEventArgs e)
{
//mDeleg = new CalcDelegate(Calc);
//AsyncCallback callback = new AsyncCallback(CalcCallback);
//int input1 = Convert.ToInt16(tbInput1.Text);
//int input2 = Convert.ToInt16(tbInput2.Text);
//string strResult = null; // dummy parameter
//mDeleg.BeginInvoke(input1, input2, ref strResult, callback, 123456789);
CalcDelegate deleg = new CalcDelegate(Calc);
//AsyncCallback callback = new AsyncCallback(CalcCallback);
int input1 = Convert.ToInt16(tbInput1.Text);
int input2 = Convert.ToInt16(tbInput2.Text);
string strResult = null; // dummy parameter
IAsyncResult ar = deleg.BeginInvoke(input1, input2, ref strResult, null, new object());
//deleg.BeginInvoke(input1, input2, ref strResult, callback, new object());
ar.AsyncWaitHandle.WaitOne();
strResult = null;
int iResult = deleg.EndInvoke(ref strResult, ar);
tbResult.Text = Convert.ToString(iResult);
tbMsg.Text = strResult;
}
void CalcCallback(IAsyncResult asyncRes)
{
endtime = DateTime.Now;
AsyncResult ares = (AsyncResult)asyncRes;
CalcDelegate delg = (CalcDelegate)ares.AsyncDelegate;
string answer = delg.EndInvoke(asyncRes);
gAnswer = answer;
}