WCF JSON POST请求，单个字符串参数未绑定并返回400 [英] WCF JSON POST request, single string parameter not binding and returning 400

问题描述

在我的WCF(天蓝色云)服务中，我想支持JSON.我正在创建一些测试方法，以查看是否一切正常.我可以使用GET调用来工作，但是当我使用简单的参数进行POST时，总会得到:

In my WCF (azure cloud) service, I want to support JSON. I am creating some test methods to see if everything works. I can get the GET calls to work, but when I'm doing a POST with a simple parameter I will always get:

The remote server returned an error: (400) Bad Request.

如果我不发送参数，它将执行该方法，但是当然会使用空值作为参数.我尝试了JSON和WebMessageBodyStyle的不同格式，但似乎都无法正常工作.

If I don't send a parameter, it will execute the method, but with a null value as parameter of course. I tried different formats of JSON and WebMessageBodyStyle, but none seem to work.

如果我将参数类型更改为Stream，则可以接收数据，但是必须手动反序列化.这不是必须的吧?

If I change the parameter type to Stream I receive the data, but I have to manually deserialize it. This shouldn't be necessary right?

接口:

        [OperationContract]
        [WebInvoke(UriTemplate = "Test",
            Method = "POST", 
            BodyStyle = WebMessageBodyStyle.WrappedRequest,
            RequestFormat = WebMessageFormat.Json,
            ResponseFormat = WebMessageFormat.Json)]
        string Test(string data);

Impl:

        public string Test(string data)
        {           
            return "result is " + data;
        } 

测试客户端:

            WebClient client = new WebClient();
            client.Headers["Content-type"] = "application/json";
            client.Encoding = System.Text.Encoding.UTF8;
            string jsonInput = "{'data':'testvalue'}";
            string postResponse = client.UploadString(postUrl, jsonInput);
            Console.WriteLine("post response: " + postResponse);

推荐答案

最黄金的组合是在结合了WebMessageBodyStyle.WrappedRequest的JSON代码中使用双引号.

The golden combination was to use double quotes in the JSON code combined with WebMessageBodyStyle.WrappedRequest.

有效的JSON:

   string jsonInput = "{\"data\":\"testvalue\"}";

将WebMessageBodyStyle设置为Bare时，以下JSON起作用:

When setting WebMessageBodyStyle to Bare, the following JSON works:

   string jsonInput = "\"testvalue\"";

这篇关于WCF JSON POST请求，单个字符串参数未绑定并返回400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！