我花了几个小时搜索这个错误，并且我测试了几乎所有它在 Google 上的内容。

我想在 C# 中使用 TCP、.NET4 和 VS2010 访问服务。

我有一个非常小的服务:

namespace WcfService_using_callbacks_via_tcp
{
    [ServiceContract(CallbackContract = typeof(ICallback), SessionMode = SessionMode.Required)]
    public interface IService1
    {
        [OperationContract]
        string Test(int value);
    }

    public interface ICallback
    {
        [OperationContract(IsOneWay = true)]
        void ServerToClient(string sms);
    }
    [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
    public class Service1 : IService1
    {
        public string Test(int value)
        {
            ICallback the_callback = OperationContext.Current.GetCallbackChannel<ICallback>();
            the_callback.ServerToClient("Callback from server, waiting 1s to return value.");
            Thread.Sleep(1000);
            return string.Format("You entered: {0}", value);
        }

    }
}

使用这个 Web.config:

<?xml version="1.0"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <services>
      <service name="WcfService_using_callbacks_via_tcp.Service1" behaviorConfiguration="Behaviour_Service1">
        <host>
          <baseAddresses>
            <add baseAddress="net.tcp://localhost:5050/Service1" />
          </baseAddresses>
        </host>
        <endpoint address="" binding="netTcpBinding" bindingConfiguration="DuplexNetTcpBinding_IService1" contract="WcfService_using_callbacks_via_tcp.IService1"/>
        <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration="mexTcp" contract="IMetadataExchange"/>
      </service>
    </services>

    <bindings>
      <!--
        TCP Binding
      -->
      <netTcpBinding>
        <binding name="DuplexNetTcpBinding_IService1" sendTimeout="00:00:01"
                 portSharingEnabled="true">

        </binding>

        <binding name="mexTcp" portSharingEnabled="true">
          <security mode="None" />
        </binding>
      </netTcpBinding>


    </bindings>

    <behaviors>
      <serviceBehaviors>
        <!--
          Behaviour to avoid a rush of clients and to expose metadata over tcp
        -->
        <behavior name="Behaviour_Service1">
          <serviceThrottling maxConcurrentSessions="10000"/>
          <serviceMetadata httpGetEnabled="true"/>
        </behavior>

        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

</configuration>

以及托管它的代码:

static void Main(string[] args)
{
    Uri base_address = new Uri("net.tcp://localhost:5050/Service1");
    ServiceHost host = null;
    try
    {
        // Create the server
        host = new ServiceHost(typeof(Service1), base_address);
        // Start the server
        host.Open();
        // Notify it
        Console.WriteLine("The service is ready at {0}", base_address);
        // Allow close the server
        Console.WriteLine("Press <Enter> to stop the service.");
        Console.ReadLine();
        // Close it
        host.Close();
    }
    catch (Exception ex)
    {
        // Opus an error occurred
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine(string.Format("Host error:\r\n{0}:\r\n{1}", ex.GetType(), ex.Message));
        Console.ReadLine();
    }finally
    {
        // Correct memory clean
        if(host != null)
            ((IDisposable)host).Dispose();
    }
}

现在我想创建客户端，但这是不可能的。我直接使用了添加服务引用和 svcutil，但我收到了这个错误:

C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC>svcutil.exe net.tcp://loc alhost:5050/Service1 Microsoft (R) Service Model Metadata Tool [Microsoft (R) Windows (R) Communication Foundation, Version 4.0.30319.1] Copyright (c) Microsoft Corporation. All rights reserved.

Attempting to download metadata from 'net.tcp://localhost:5050/Service1' using W S-Metadata Exchange. This URL does not support DISCO. Microsoft (R) Service Model Metadata Tool [Microsoft (R) Windows (R) Communication Foundation, Version 4.0.30319.1] Copyright (c) Microsoft Corporation. All rights reserved.

Error: Cannot obtain Metadata from net.tcp://localhost:5050/Service1

If this is a Windows (R) Communication Foundation service to which you have acce ss, please check that you have enabled metadata publishing at the specified addr ess. For help enabling metadata publishing, please refer to the MSDN documentat ion at http://go.microsoft.com/fwlink/?LinkId=65455.

WS-Metadata Exchange Error URI: net.tcp://localhost:5050/Service1

Metadata contains a reference that cannot be resolved: 'net.tcp://localhost: 5050/Service1'.

The socket connection was aborted. This could be caused by an error processi ng your message or a receive timeout being exceeded by the remote host, or an un derlying network resource issue. Local socket timeout was '00:04:59.9863281'.

Se ha forzado la interrupción de una conexión existente por el host remoto

If you would like more help, type "svcutil /?"

因此，我可以毫无问题地托管服务，但我无法创建代理。

我几乎尝试了我找到的所有配置，但我认为当前的 web.config 是正确的。有端点使用的行为、安全性和使用 mex 的绑定(bind)。

我尝试创建一个 app.config 并将其设置到与 svcutil.exe 相同的文件夹中。

最佳答案

您缺少服务配置

<system.serviceModel>
  <services>
    <service name="WcfService_using_callbacks_via_tcp.Service1" 
      behaviorConfiguration="Behavior_Service1">
      <host>
        <baseAddresses>
          <add baseAddress="net.tcp://localhost:5050/Service1" />
        </baseAddresses>
      </host>
      <endpoint address="" contract="WcfService_using_callbacks_via_tcp.IService1"
         binding="netTcpBinding" bindingConfiguration="DuplexNetTcpBinding_IService1" />
      <endpoint address="mex" contract="IMetadataExchange" binding="mexTcpBindng" />
    </service>
  </services>
  ...
</system.serviceModel>

使用此配置，您不需要在代码中定义基地址。

关于WCF 元数据包含无法解析的引用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4660480/