WCF REST服务不接受JSON在.NET 4中 [英] WCF REST Service not accepting JSON in .Net 4

问题描述

我一直在尝试了分别介绍.NET 4.0的一部分StandardEndpoints和我得到的最奇特的错误。

I've been trying out the StandardEndpoints that were introduced as part of .Net 4 and I'm getting the most peculiar of errors.

我的code

[ServiceContract]
public interface IAuthenticator
{
    [OperationContract]
    [WebInvoke(UriTemplate = "AuthenticateUser", Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json)]
    AuthPacket AuthenticateUser(string Username, string Password, string DeviceId);
}

我的web.config

My web.config

  

<system.web>
  <compilation debug="true" targetFramework="4.0" />
</system.web>

<system.webServer>
  <modules runAllManagedModulesForAllRequests="true">
  </modules>
</system.webServer>

<system.serviceModel>
  <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
  <standardEndpoints>
    <webHttpEndpoint>
      <!--
          Configure the WCF REST service base address via the global.asax.cs file and the default endpoint
          via the attributes on the <standardEndpoint> element below
      -->
      <standardEndpoint name="" helpEnabled="true" automaticFormatSelectionEnabled="true"/>
    </webHttpEndpoint>
  </standardEndpoints>
</system.serviceModel>

这是推动我疯了例外！

415 Cannot process the message because the content type 'application/json' was not 
the expected type 'text/xml; charset=utf-8'.

我可以让这个问题要追溯到宣布每个服务的。NET 3.5的标准去走，但是，如果我没记错的话，主要的升级，WCF与.NET 4中之一是它的能力，处理这样的东西。难道我做错了什么？

I can make the problem going away by going back to the .Net 3.5 standard of declaring each service, but, unless I am mistaken, one of the major upgrades in WCF with .Net 4 was it's ability to handle stuff like this. Am I doing something wrong?

推荐答案

如果我正确地阅读本经营合同，你定义了JSON是您的响应格式 - 但不是你的请求格式为：

If I read this operation contract correctly, you have defined JSON to be your response format - but not your request format:

[ServiceContract]
public interface IAuthenticator
{
    [OperationContract]
    [WebInvoke(UriTemplate = "AuthenticateUser", Method = "POST", 
     BodyStyle = WebMessageBodyStyle.WrappedRequest, 
     ResponseFormat = WebMessageFormat.Json)]
    AuthPacket AuthenticateUser(string Username, string Password, string DeviceId);
}

莫非是这个问题？如果添加，会发生什么 RequestFormat = WebMessageFormat.Json 您的运营合同？

[ServiceContract]
public interface IAuthenticator
{
    [OperationContract]
    [WebInvoke(UriTemplate = "AuthenticateUser", Method = "POST", 
     BodyStyle = WebMessageBodyStyle.WrappedRequest, 
     RequestFormat = WebMessageFormat.Json,   <== ADD THIS HERE TO YOUR CODE !
     ResponseFormat = WebMessageFormat.Json)]
    AuthPacket AuthenticateUser(string Username, string Password, string DeviceId);
}

更新：如果您正在使用WCF 4开箱即用，它的协议映射将相关联的http：// 方案与 basicHttpBinding的。

Update: if you're using WCF 4 "out of the box", its protocol mapping will associate the http:// scheme with basicHttpBinding.

要解决这个问题，你需要重写这样的默认协议映射（在你的web.config）：

To fix this, you need to override the default protocol mapping like this (in your web.config):

默认协议映射

在这个问题的答案很简单。 WCF定义传输协议方案之间的默认协议映射（例如http，的net.tcp，net.pipe等）和内置的WCF绑定。默认的协议映射发现在.NET 4 machine.config.comments文件，它看起来是这样的：

The answer to this question is simple. WCF defines a default protocol mapping between transport protocol schemes (e.g., http, net.tcp, net.pipe, etc) and the built-in WCF bindings. The default protocol mapping is found in the .NET 4 machine.config.comments file and it looks like this:

<system.serviceModel>
   <protocolMapping>
       <add scheme="http" binding="webHttpBinding" bindingConfiguration="" />
   </protocolMapping>

现在，在默认情况下的http：// ..... 将映射到的WebHttpBinding

Now, by default http://..... would be mapped to webHttpBinding.

（摘自：开发人员的介绍到Windows Communication Foundation的4 ）

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