使用HttpRequest调用Web服务将返回HTTP 500 [英] Calling webservice with HttpRequest returns HTTP 500

问题描述

我有一个简单的网络服务功能

I have a simple webservice function

        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public string DannyTest(t)
        {
                Dictionary<string, object> parameters = new Dictionary<string, object>()
                {
                    { "danny", "Heeft een snelle motor"}
                };

                return new JavaScriptSerializer().Serialize(parameters);
        }

如果我使用此客户端代码调用此函数:

If I call this function with this client code:

                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
                myRequest.Method = "POST";
                myRequest.ContentType = "application/json";
                myRequest.Accept = "application/json";
                myRequest.ContentLength = 0;

                WebResponse response = myRequest.GetResponse();
                Stream str = response.GetResponseStream();

                StreamReader reader = new StreamReader(str);

                Response.Write(reader.ReadToEnd());

一切都很好.

但是，如果我要发布JSON，并将web方法更改为此:

However if I want to post JSON, and change the web method to this:

        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public string DannyTest(string content)
        {
                Dictionary<string, object> parameters = new Dictionary<string, object>()
                {
                    { "danny", "Heeft een snelle motor"}
                };

                return new JavaScriptSerializer().Serialize(parameters);
        }

并这样称呼它:

                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
                myRequest.Method = "POST";
                myRequest.ContentType = "application/json";
                myRequest.Accept = "application/json";

                string jsonString = "{\"x\":\"true\"}";
                Stream s = myRequest.GetRequestStream();

                using (StreamWriter streamWriter = new StreamWriter(myRequest.GetRequestStream()))
                {
                    streamWriter.Write(jsonString);
                    streamWriter.Flush();
                }
                   
                WebResponse response = myRequest.GetResponse();
                Stream str = response.GetResponseStream();

                StreamReader reader = new StreamReader(str);

                Response.Write(reader.ReadToEnd());

我收到内部服务器错误500.无论我如何尝试:只要我想使用参数(字符串，对象，命名值)，Web服务都将返回500.

I get an internal server error 500. No matter what I try: as soon as I want to use an argument (string, object, namedvalue) the webservice returns 500. 

如何正确调用此Web服务并为其提供JSON?

How do I make a correct call to this webservice and provide JSON with it?

亚瑟

推荐答案

这是.NET中最古老的Web服务技术.相反，尝试使用入门"之一.这里的文章

This is the very oldest of the Web Service technologies in .NET.  Instead try with one of the "getting started" articles here

https://www.asp.net/web-api

David

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