static void MyCallBackMethod(IAsyncResult ar)
{
AsyncResult asyncResult = (AsyncResult)ar;
MathOperation op = (MathOperation)asyncResult.AsyncDelegate;
double result = op.EndInvoke(ar);
Console.WriteLine("Result: {0}", result);
}
void myCallBackMath(IAsyncResult ar)
{
//IAsyncResult代表非同步的作業狀態
//AsyncState取得使用者定義物件
//AsyncResult封裝委派上面非同步作業的結果
//AsyncDelegate取得非同步呼叫已叫用的委派物件。回傳:非同步呼叫已叫用委派物件
object hello = ar.AsyncState; //ar的AsyncState方法結束會回傳一個 hello物件變數//像是object HelloTest = null;object helloa = HelloTest;
AsyncResult asyncResult = (AsyncResult)ar; //hello物件變數就是AsyncResult的物件變數
MathOperation op = (MathOperation)asyncResult.AsyncDelegate; //AsyncDelegate回傳asyncResult物件變數
double rs = op.EndInvoke(ar); //EndInvoke呼叫完畢後將傳入數值的結果回傳回來
Console.WriteLine("回呼回傳值: {0}, 資料引數: {1}", rs, hello);
}
