public void Add(double x, double y)
{
double result = x + y;
ICalculatorCallBack callback = OperationContext.Current.GetCallbackChannel <ICalculatorCallBack>();
callback.DisplayResult(result, x, y);
}
/// <summary>
/// 完成计算，然后去回调
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
public void Plus(int x, int y)
{
int result = x + y;
Thread.Sleep(2000);
ICalculatorCallBack callBack = OperationContext.Current.GetCallbackChannel <ICalculatorCallBack>();
callBack.Show(x, y, result);
}
