public int EndCalculate(ref string resultStr, IAsyncResult ar)
{
CalculateAsyncResult result = ar as CalculateAsyncResult;
if (Interlocked.CompareExchange(ref result.EndCallCount, 1, 0) == 1)
{
throw new Exception("End方法只能调用一次。");
}
result.AsyncWaitHandle.WaitOne();
resultStr = result.ResultStr;
return(result.FinnalyResult);
}
/// <summary>
/// 异步进行耗时计算
/// </summary>
/// <param name="ob">CalculateAsyncResult实例本身</param>
private static void AsyncCalculate(object obj)
{
CalculateAsyncResult _asyncResult = obj as CalculateAsyncResult;
Thread.SpinWait(1000);
_asyncResult.FinnalyResult = _asyncResult._calcNum1 * _asyncResult._calcNum2;
_asyncResult.ResultStr = _asyncResult.FinnalyResult.ToString();
// 是否同步完成
_asyncResult._completedSynchronously = false;
_asyncResult._isCompleted = true;
((ManualResetEvent)_asyncResult.AsyncWaitHandle).Set();
if (_asyncResult._userCallback != null)
{
_asyncResult._userCallback(ref _asyncResult.ResultStr, _asyncResult);
}
}
public IAsyncResult BeginCalculate(int num1, int num2, RefAsyncCallback userCallback, object asyncState)
{
CalculateAsyncResult result = new CalculateAsyncResult(num1, num2, userCallback, asyncState);
return(result);
}