如何通过JSON请求从fiddler调用wcf restful服务？

Question

我是wcf restful service的新手.我找不到问题,为什么我的wcf宁静服务给出"错误的请求".我使用.NET 4.0.

我的服务是:

[OperationContract(Name="Add")]
[WebInvoke(UriTemplate = "test/", Method = "POST",
          ResponseFormat=WebMessageFormat.Json,
          RequestFormat=WebMessageFormat.Json )]
public int Add(Number n1)
{
    res = Convert.ToInt32(n1.Number1) + Convert.ToInt32(n1.Number2);
    return res;
}

数据是......

[Serializable]
    public class Number
    {
        public int Number1 { get; set; }
        public int Number2 { get; set; }
    }

当我从fiddler打电话回来'HTTP/1.1 400 Bad Request'时

我的fiddler请求标题是:

User-Agent: Fiddler
Host: localhost:4217
Content-Type: application/json; charset=utf-8

请求正文是:

{"Number1":"7","Number2":"7"}

响应头是:

HTTP/1.1 400 Bad Request
Server: ASP.NET Development Server/10.0.0.0
Date: Sun, 14 Aug 2011 18:10:21 GMT
X-AspNet-Version: 4.0.30319
Content-Length: 5450
Cache-Control: private
Content-Type: text/html
Connection: Close

但是,如果我通过C#客户端程序调用此服务,则可以.

我的客户代码是:

uri = "http://localhost:4217/Service1.svc/";
Number obj = new Number() { Number1 = 7, Number2 = 7 };
using (HttpResponseMessage response = new HttpClient().Post(uri+"test/",
       HttpContentExtensions.CreateDataContract(obj)))
{
    string res = response.Content.ReadAsString();
    return res.ToString();
}

请帮我........

谢谢.

Answer 1

您将发现代码问题的方法是在服务器上启用跟踪,并且它将解释该问题.我用你的代码写了一个简单的测试,它有一个类似的错误(400),并且跟踪有以下错误:

The data contract type 'WcfForums.StackOverflow_7058942+Number' cannot be
deserialized because the required data members '<Number1>k__BackingField,
<Number2>k__BackingField' were not found.

标记的数据类型[Serializable]序列化对象中的所有字段,而不是属性.通过注释掉该属性,代码实际上运行良好(该类型然后属于"POCO"(Plain Old Clr Object)规则,该规则序列化所有公共字段和属性.

public class StackOverflow_7058942
{
    //[Serializable]
    public class Number
    {
        public int Number1 { get; set; }
        public int Number2 { get; set; }
    }
    [ServiceContract]
    public class Service
    {
        [OperationContract(Name = "Add")]
        [WebInvoke(UriTemplate = "test/", Method = "POST", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json)]
        public int Add(Number n1)
        {
            int res = Convert.ToInt32(n1.Number1) + Convert.ToInt32(n1.Number2);
            return res;
        }
    }
    public static void Test()
    {
        string baseAddress = "http://" + Environment.MachineName + ":8000/Service";
        ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress));
        host.AddServiceEndpoint(typeof(Service), new WebHttpBinding(), "").Behaviors.Add(new WebHttpBehavior());
        host.Open();
        Console.WriteLine("Host opened");

        WebClient c = new WebClient();
        c.Headers[HttpRequestHeader.ContentType] = "application/json; charset=utf-8";
        c.Encoding = Encoding.UTF8;
        Console.WriteLine(c.UploadString(baseAddress + "/test/", "{\"Number1\":\"7\",\"Number2\":\"7\"}"));

        Console.Write("Press ENTER to close the host");
        Console.ReadLine();
        host.Close();
    }
}