Wcf Client 异常和关闭的通用处理方法

在项目中采用wcf通讯，客户端很多地方调用服务，需要统一的处理超时和通讯异常以及关闭连接。

1.调用尝试和异常捕获

首先，项目中添加一个通用类ServiceDelegate.cs

 1 public delegate void UseServiceDelegate<T>(T proxy);
 2 
 3 public static class Service<T>
 4 {
 5     public static ChannelFactory<T> _channelFactory = new ChannelFactory<T>(""); 
 6 
 7     public static void Use(UseServiceDelegate<T> codeBlock)
 8     {
 9         T proxy = _channelFactory.CreateChannel();
10         bool success = false;
11 
12 
13        Exception mostRecentEx = null;
14        for(int i=0; i<5; i++)  // Attempt a maximum of 5 times 
15        {
16            try
17            {
18                codeBlock(proxy);
19                proxy.Close();
20                success = true;
21                break;
22            }
23 
24            // The following is typically thrown on the client when a channel is terminated due to the server closing the connection.
25            catch (ChannelTerminatedException cte)
26            {
27               mostRecentEx = cte;
28                proxy.Abort();
29                //  delay (backoff) and retry 
30                Thread.Sleep(1000 * (i + 1)); 
31            }
32 
33            // The following is thrown when a remote endpoint could not be found or reached.  The endpoint may not be found or 
34            // reachable because the remote endpoint is down, the remote endpoint is unreachable, or because the remote network is unreachable.
35            catch (EndpointNotFoundException enfe)
36            {
37               mostRecentEx = enfe;
38                proxy.Abort();
39                //  delay (backoff) and retry 
40                Thread.Sleep(1000 * (i + 1)); 
41            }
42 
43            // The following exception that is thrown when a server is too busy to accept a message.
44            catch (ServerTooBusyException stbe)
45            {
46               mostRecentEx = stbe;
47                proxy.Abort();
48 
49                //  delay (backoff) and retry 
50                Thread.Sleep(1000 * (i + 1)); 
51            }
52 
53            catch(Exception  )
54            {
55                 // rethrow any other exception not defined here
56                 // You may want to define a custom Exception class to pass information such as failure count, and failure type
57                 proxy.Abort();
58                 throw ;
59            }
60        }
61        if (mostRecentEx != null) 
62        { 
63            proxy.Abort();
64            throw new Exception("WCF call failed after 5 retries.", mostRecentEx );
65        }
66 
67     }
68 }

View Code