学会WCF之试错法——超时

服务契约

[ServiceContract]
    public interface IService
    {
        [OperationContract]
        string GetData(int value);

        [OperationContract]
        string GetString(string value);

        [OperationContract]
        void Upload(Request request);
    }

    [MessageContract]
    public class Request
    {
        [MessageHeader(MustUnderstand = true)]
        public string FileName { get; set; }

        [MessageBodyMember(Order = )]
        public Stream Content {get;set;}
}

服务

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)]
    public class Service : IService
    {
        public string GetData(int value)
        {
            //Thread.Sleep(120000);
            return string.Format("You entered: {0}", value);
        }

        public string GetString(string value)
        {
            //Thread.Sleep(120000);
            return string.Format("You entered: {0}", value);
        }

        public void Upload(Request request)
        {
            try
            {
                StreamReader sr = new StreamReader(request.Content, Encoding.GetEncoding("GB2312"));
                StreamWriter sw = new StreamWriter("E:\\" + request.FileName + ".txt", false, Encoding.GetEncoding("GB2312"));
                while (!sr.EndOfStream)
                {
                    sw.WriteLine(sr.ReadLine());
                    //Thread.Sleep(5000);
                }
                sr.Close();
                sw.Close();
            }
            catch (Exception ex)
            { }

        }
}

服务配置

<system.serviceModel>
    <services>
      <service name="WCF_Find_Error_Lib.Service">
        <endpoint address="" binding="basicHttpBinding" contract="WCF_Find_Error_Lib.IService">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost/S" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="True" httpsGetEnabled="True"/>
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

客户端代理

public class ServiceProxy
    {
        public string GetData(int value)
        {
            string ret = null;
            ServiceClient client = null;
            try
            {
                client = new ServiceClient();
                ret = client.GetData(value);
                client.Close();
            }
            catch
            {
                if (client != null)
                {
                    client.Abort();
                }
                throw;
            }
            return ret;
        }

        public string GetString(string value)
        {
            string ret = null;
            ServiceClient client = null;
            try
            {
                client = new ServiceClient();
                ret = client.GetString(value);
                client.Close();
            }
            catch
            {
                if (client != null)
                {
                    client.Abort();
                }
                throw;
            }
            return ret;
        }
        public void Upload(Request request)
        {
            ServiceClient client = null;
            try
            {
                client = new ServiceClient();
                client.Upload(request);
                client.Close();
            }
            catch
            {
                if (client != null)
                {
                    client.Abort();
                }
                throw;
            }
        }

    }

    [ServiceContractAttribute(ConfigurationName = "IService")]
    public interface IService
    {

        [System.ServiceModel.OperationContractAttribute(Action = "http://tempuri.org/IService/GetData", ReplyAction = "http://tempuri.org/IService/GetDataResponse")]
        string GetData(int value);

        [System.ServiceModel.OperationContractAttribute(Action = "http://tempuri.org/IService/GetString", ReplyAction = "http://tempuri.org/IService/GetStringResponse")]
        string GetString(string value);

        [System.ServiceModel.OperationContractAttribute(Action = "http://tempuri.org/IService/Upload", ReplyAction = "http://tempuri.org/IService/UploadResponse")]
        void Upload(Request request);
    }
    [MessageContract]
    public class Request
    {
        [MessageHeader(MustUnderstand = true)]
        public string FileName { get; set; }

        [MessageBodyMember(Order = 1)]
        public Stream Content { get; set; }
}
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)]
    public class ServiceClient : System.ServiceModel.ClientBase<IService>, IService
    {

        public ServiceClient()
        {
        }

        public string GetData(int value)
        {
            return base.Channel.GetData(value);
        }

        public string GetString(string value)
        {
            return base.Channel.GetString(value);
        }

        public void Upload(Request request)
        {
            base.Channel.Upload(request);
        }
}

客户端配置

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IService" />
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost/S" binding="basicHttpBinding"
          bindingConfiguration="BasicHttpBinding_IService" contract="IService"
          name="BasicHttpBinding_IService" />
    </client>
  </system.serviceModel>

1 客户端调用超时

 

运行客户端，执行调用

ServiceProxy proxy = new ServiceProxy();

string s = proxy.GetData(1);

 

通过配置sendTimeout参数设定超时时间，超时时间默认为1分钟，上述配置中采用了默认超时时间。

Message

请求通道在等待 00:00:59.9469970 以后答复时超时。增加传递给请求调用的超时值，或者增加绑定上的 SendTimeout 值。分配给此操作的时间可能已经是更长超时的一部分。

 

Stacktrace:

Server stack trace:

在 System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)

在 System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)

在 System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)

在 System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)

在 System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:

在 System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)

在 System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

在 Client.IService.GetData(Int32 value)

在 Client.ServiceClient.GetData(Int32 value) 位置 e:\projgxz_myself\WCF_Find_Error\Client\ServiceProxy.cs:行号 52

在 Client.ServiceProxy.GetData(Int32 value) 位置 e:\projgxz_myself\WCF_Find_Error\Client\ServiceProxy.cs:行号 19

在 Client.Program.Main(String[] args) 位置 e:\projgxz_myself\WCF_Find_Error\Client\Program.cs:行号 17

增大客户端调用超时时间，可解决超时问题

例如，超时时间设置为10分钟，满足此次调用需求。

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IService" sendTimeout="00:10:00"/>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost/S" binding="basicHttpBinding"
          bindingConfiguration="BasicHttpBinding_IService" contract="IService"
          name="BasicHttpBinding_IService" />
    </client>
  </system.serviceModel>

2 非活动状态的最大时间间隔

通过配置receiveTimeout设定时间间隔，默认值为 10 分钟。

服务实例化模式改为为会话模式：

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Reentrant)]

服务端配置

<netTcpBinding>
     <binding name="NetTcpBinding_IService" maxBufferSize="270000" maxReceivedMessageSize="270000" transferMode="Buffered" receiveTimeout="00:00:10">
       <readerQuotas maxStringContentLength="240000"/>
       <reliableSession enabled="true" inactivityTimeout="00:00:10"/>
     </binding>
</netTcpBinding>

客户端配置

<netTcpBinding>
     <binding name="NetTcpBinding_IService" sendTimeout="00:00:10" maxBufferSize="2700000" maxReceivedMessageSize="2700000" transferMode="Buffered" >
       <readerQuotas maxStringContentLength="240000"/>
     </binding>
</netTcpBinding>

客户端调用

using (ServiceClient client = new ServiceClient())
                {
                    StreamReader sr = new StreamReader("D:\\CSBMTEMP.txt", Encoding.Default);
                    string str = sr.ReadToEnd();
                    sr.Close();
                    client.GetString(str);

                    Thread.Sleep();
                    client.GetString(str);
                }

运行客户端程序，成功捕获异常

 

上述异常中给出的错误信息并未指出具体的异常原因，所以从中很难推测是由于超时时间设置问题。遇到此类问题只能根据经验逐项排查，当然这是很浪费时间的，尤其是对于复杂的程序，更是如此。

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时间仓促，水平有限，如有不当之处，欢迎指正。