何时使用异步模式处理wcf对象

Question

假设我从同步版本开始:

 using(var svc = new ServiceObject()) {
     var result = svc.DoSomething();
     // do stuff with result
 }

我结束了

var svc = new ServiceObject();
svc.BeginDoSomething(async => {
    var result = svc.EndDoSomething(async);
    svc.Dispose();
    // do stuff with result
},null);

1)这是调用Dispose()的正确位置吗？

2)有没有办法使用using()？

Answer 1

来自Rotem Bloom的博客:http: //caught-in-a-web.blogspot.com/2008/05/best-practices-how-to-dispose-wcf.html

最佳实践:如何处置WCF客户端

对于Dispose WCF客户端,不建议使用using语句(在Visual Basic中使用).这是因为using语句的结束可能会导致异常,这些异常可能会掩盖您可能需要了解的其他异常.

using (CalculatorClient client = new CalculatorClient())
{
...
} // this line might throw

Console.WriteLine("Hope this code wasn't important, because it might not happen.");

The correct way to do it is:
try
{
    client.Close();
}
catch (CommunicationException)
{
    client.Abort();
}
catch (TimeoutException)
{
    client.Abort();
}
catch
{
     client.Abort();
     throw;
}