WCF REST 当为POST方式+JSON数据类型时，如何传递参数

WCF REST Post pass JSON parameters.cs

// 协议定义
[OperationContract]
[WebInvoke
(
    // UriTemplate="/EchoWithPost",
    // Method="POST", 默认为POST
    // BodyStyle = WebMessageBodyStyle.Bare, 默认为Bare无包裹
    RequestFormat=WebMessageFormat.Json, 
    ResponseFormat=WebMessageFormat.Json
)
]
string EchoWithPost(string s);

// 调用

string baseAddress = "http://" + Environment.MachineName + ":4455/Service";
ServiceHost host = new ServiceHost(typeof(Service2), new Uri(baseAddress));
host.AddServiceEndpoint(typeof(Service2), new WebHttpBinding(), "").Behaviors.Add(new WebHttpBehavior());
host.Open();
Console.WriteLine("Host opened");

WebClient c = new WebClient();

// ** 必须设置ContentType = application/json **
c.Headers[HttpRequestHeader.ContentType] = "application/json; charset=utf-8"; 
c.Encoding = Encoding.UTF8;

// 以POST传递内容，内容为JSON文本
// 当形参为string，则只需传递"XXX"即可，注意必须有双引号
Console.WriteLine(c.UploadString(baseAddress + "/test/", "{\"Number1\":7,\"Number2\":7}"));

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