如何将POST json从C#发送到asp.net web api

Question

如何从C#向ASP.Net web api发出POST请求.我使用了Newtonsoft DLL文件来创建json,但是,我无法将其发送到api.

我的代码是:

        Login login = new Login
        {
            userid = username.Text,
            pass = pass.Text
        };
        string json = JsonConvert.SerializeObject(login, Formatting.Indented);

如何将此json发送到web api,并获得响应？

编辑

string url = "myurl";


        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";
        httpWebRequest.Accept = "application/json; charset=utf-8";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {

            json = json.Replace("\r\n","");
            //json = json.Replace("\",", "\","   + "\"" +"\u002B");
            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();
        }

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            pass.Text = result.ToString();
        }

Answer 1

我通过一些编辑使它成功.我没有直接序列化json对象,而是使用了一个类,并为其赋值,并使用JavaScriptSerializer对其进行序列化.谢谢你的帮助Shekhar.

        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";
        httpWebRequest.Accept = "application/json; charset=utf-8";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string loginjson = new JavaScriptSerializer().Serialize(new
            {
                userid = username.Text,
                password = pass.Text
            });

            streamWriter.Write(loginjson);
            streamWriter.Flush();
            streamWriter.Close();

            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
                pass.Text = result.ToString();
            }
        }

Answer 2

您可以使用HttpWebRequest类创建请求，并使用StreamWriter该请求编写 Json，最后HttpWebResponse从 Web API 获取。

var httpWebRequest = (HttpWebRequest)WebRequest.Create("path/api");
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
   streamWriter.Write(json);
   streamWriter.Flush();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();