c# - 错误 : Cannot obtain Metadata; using WCF Test client, C#，并尝试实现 webhttpbinding 和 json

Question

我收到了传说中的 Error: Cannot obtain Metadata from... 消息，特别是 http://localhost:1640/Service1.svc 我已经搜索过了stackoverflow 和谷歌，到目前为止，都没有帮助。我创建了一个新产品来简化它，但它仍然无法正常工作。所以我在这里寻求帮助。

我正在尝试设置一个使用 JSON 的 WCF 服务，这意味着我需要在 C# 中使用 webhttpbinding。当我使用 WCF 测试客户端时，出现上述元数据错误。我正在使用 Visual Studio Express 2010 和目标框架。我已经在这两天了，不明白为什么或出了什么问题。

如果有任何帮助，我将不胜感激。谢谢。

这是我的 web.config 文件:

<?xml version="1.0"?>
<configuration>

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

    <services>
      <service name="WcfService4.Service1"
        behaviorConfiguration="jsonRestDefault">

        <endpoint 
              name="jsonRestEndpoint"
              behaviorConfiguration="RESTFriendly"
              binding="webHttpBinding"
              contract="IService1"
              address="http://localhost:1640/Service1.svc"/>
      </service>
    </services>

    <behaviors>
      <serviceBehaviors>
        <behavior name="jsonRestDefault">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="RESTFriendly">
          <webHttp />
        </behavior>
      </endpointBehaviors>
    </behaviors>

    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

</configuration>

这是 IService1.cs 文件:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace WcfService4
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        [WebInvoke(
            Method = "GET", 
            UriTemplate = "players",
            RequestFormat = WebMessageFormat.Json,
            ResponseFormat = WebMessageFormat.Json,
            BodyStyle = WebMessageBodyStyle.Bare)]
        List<Person> GetPlayers();
    }

    // Use a data contract as illustrated in the sample below to add composite types to service operations.
    [DataContract]
    public class Person
    {
        [DataMember]
        public string FirstName { get; set; }

        [DataMember]
        public string LastName { get; set; }

        [DataMember]
        public int Age { get; set; }

        public Person(string firstName, string lastName, int age)
        {
            this.FirstName = firstName;
            this.LastName = lastName;
            this.Age = age;
        }
    }
}

这是 Service1.svc.cs 文件:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using System.Net;

namespace WcfService4
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
    public class Service1 : IService1
    {
        public List<Person> GetPlayers()
        {
            List<Person> players = new List<Person>();
            players.Add(new Person ( "Peyton", "Manning", 35 ) );
            players.Add(new Person ( "Drew", "Brees", 31 ) );
            players.Add(new Person ( "Brett", "Favre", 38 ) );

            return players;
        }
    }
}

Answer 1

看看这个link

内容如下:

WebHttpBinding is a REST-based binding - REST does not expose metadata like WSDL/XSD contrary to SOAP.