WCF中的mexTcpBinding-IMetadataExchange错误 [英] mexTcpBinding in WCF - IMetadataExchange errors

问题描述

我想使WCF-over-TCP服务正常工作.我在修改自己的项目时遇到了一些问题，因此我想从VS2008中包含的基本" WCF模板开始.

I'm wanting to get a WCF-over-TCP service working. I was having some problems with modifying my own project, so I thought I'd start with the "base" WCF template included in VS2008.

这是最初的WCF App.config，当我运行该服务时，WCF测试客户端可以正常使用它:

Here is the initial WCF App.config and when I run the service the WCF Test Client can work with it fine:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.web>
        <compilation debug="true" />
    </system.web>
    <system.serviceModel>
        <services>
            <service name="WcfTcpTest.Service1" behaviorConfiguration="WcfTcpTest.Service1Behavior">
                <host>
                    <baseAddresses>
                        <add baseAddress="http://localhost:8731/Design_Time_Addresses/WcfTcpTest/Service1/" />
                    </baseAddresses>
                </host>
                <endpoint address="" binding="wsHttpBinding" contract="WcfTcpTest.IService1">
                    <identity>
                        <dns value="localhost"/>
                    </identity>
                </endpoint>
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <behavior name="WcfTcpTest.Service1Behavior">
                    <serviceMetadata httpGetEnabled="True"/>
                    <serviceDebug includeExceptionDetailInFaults="True" />
                </behavior>
            </serviceBehaviors>
        </behaviors>
    </system.serviceModel>
</configuration>

这很完美，完全没有问题.

This works perfectly, no issues at all.

我认为将其从HTTP更改为TCP是微不足道的:将绑定更改为它们的TCP等效项并删除httpGetEnabled serviceMetadata元素:

I figured changing it from HTTP to TCP would be trivial: change the bindings to their TCP equivalents and remove the httpGetEnabled serviceMetadata element:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.web>
        <compilation debug="true" />
    </system.web>
    <system.serviceModel>
        <services>
            <service name="WcfTcpTest.Service1" behaviorConfiguration="WcfTcpTest.Service1Behavior">
                <host>
                    <baseAddresses>
                        <add baseAddress="net.tcp://localhost:1337/Service1/" />
                    </baseAddresses>
                </host>
                <endpoint address="" binding="netTcpBinding" contract="WcfTcpTest.IService1">
                    <identity>
                        <dns value="localhost"/>
                    </identity>
                </endpoint>
                <endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange"/>
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <behavior name="WcfTcpTest.Service1Behavior">
                    <serviceDebug includeExceptionDetailInFaults="True" />
                </behavior>
            </serviceBehaviors>
        </behaviors>
    </system.serviceModel>
</configuration>

但是当我运行它时，我在WCF服务主机中收到此错误:

But when I run this I get this error in the WCF Service Host:

System.InvalidOperationException:在服务Service1实施的合同列表中找不到合同名称"IMetadataExchange".将ServiceMetadataBehavior添加到配置文件或直接添加到ServiceHost，以启用对此合同的支持.

System.InvalidOperationException: The contract name 'IMetadataExchange' could not be found in the list of contracts implemented by the service Service1. Add a ServiceMetadataBehavior to the configuration file or to the ServiceHost directly to enable support for this contract.

我感觉到您无法使用TCP发送元数据，但这就是为什么要使用mexTcpBinding选项的原因?

I get the feeling that you can't send metadata using TCP, but that's the case why is there a mexTcpBinding option?

推荐答案

好吧，如果您希望拥有元数据-TCP或HTTP-您仍然需要包含serviceMetadata行为！

Well, if you want to have metadata - TCP or HTTP - you still need to include the serviceMetadata behavior!

<behaviors>
    <serviceBehaviors>
        <behavior name="WcfTcpTest.Service1Behavior">
            <serviceDebug includeExceptionDetailInFaults="True" />
            <serviceMetadata />
        </behavior>
    </serviceBehaviors>
</behaviors>

当然，您不能在其上带有"HttpGetEnabled"-但必须存在该行为本身才能启用元数据交换(并因此交换IMetadataExchange合同).

Sure, you can't have a "HttpGetEnabled" on it - but the behavior itself must be present in order to enable exchange of metadata (and thus the IMetadataExchange contract).

这篇关于WCF中的mexTcpBinding-IMetadataExchange错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！