异步调用WCF的方法需要小心的地方

直接使用下面的代码，由于client对象占用的资源没有被释放，会导致内存泄露
GetSimServiceReference.GetSimServiceClient client = new GetSimServiceReference.GetSimServiceClient()
client.computerSimAsync(DepartmentNo, FileID, F_intput.Length, ReadStringArrayFromStrings());
上面的问题，可以使用下面的方法来避免

                    using (GetSimServiceReference.GetSimServiceClient client = new GetSimServiceReference.GetSimServiceClient()){client.computerSimA(DepartmentNo, FileID, F_intput.Length, ReadStringArrayFromStrings());}

但是如果使用异步调用的方式，会导致调用不到远程服务，并且没有任何异常提示，很是让人摸不到头脑

                    using (GetSimServiceReference.GetSimServiceClient client = new GetSimServiceReference.GetSimServiceClient()){client.computerSimAsync(DepartmentNo, FileID, F_intput.Length, ReadStringArrayFromStrings());}

最后，采用了如下的代码：

                    try{GetSimServiceReference.GetSimServiceClient client = new GetSimServiceReference.GetSimServiceClient();client.computerSim(DepartmentNo, FileID, F_intput.Length, ReadStringArrayFromStrings());if (client.State != CommunicationState.Faulted) client.Close();}catch (CommunicationObjectFaultedException cofe){ShowException.SaveLogAsTXTInfoex("调用WCF服务失败，异常信息：" + cofe.Message);}catch (Exception ex){ShowException.SaveLogAsTXTInfoex("调用WCF服务失败，异常信息：" + ex.Message+f_intput.FullName);}