c# - System.Net.Http : missing from namespace?(使用.net 4.5)

Question

TL; DR:我是这门语言的新手，不知道自己在做什么

到目前为止，这是我的类(class):

using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Web;
using System.Net;
using System.IO;

public class MyClass
    {
        private const string URL = "https://sub.domain.com/objects.json?api_key=123";
        private const string data = @"{""object"":{""name"":""Title""}}";

        public static void CreateObject()
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.Method = "POST";
            request.ContentType = "application/json";
            request.ContentLength = data.Length;
            StreamWriter requestWriter = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
            requestWriter.Write(data);
            requestWriter.Close();

            try
            {
                // get the response
                WebResponse webResponse = request.GetResponse();
                Stream webStream = webResponse.GetResponseStream();
                StreamReader responseReader = new StreamReader(webStream);
                string response = responseReader.ReadToEnd();
                responseReader.Close();
            }
            catch (WebException we)
            {
                string webExceptionMessage = we.Message;
            }
            catch (Exception ex)
            {
                // no need to do anything special here....
            }
        }

        static void Main(string[] args)
        {
            MyClass.CreateObject();
        }
}

当我执行 csc filename.cs 时，出现以下错误:

The type or namespace name 'Http' does not exist in the namespace 'System.Net' (are you missing an assembly reference?)

Answer 1

HttpClient住在System.Net.Http命名空间。

您需要添加:

using System.Net.Http;

并确保您在 .NET 4.5 中引用 System.Net.Http.dll。

---

发布的代码似乎没有对 webClient 做任何事情。使用 HttpWebRequest 实际编译的代码有问题吗？

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更新

要打开添加引用对话框，请在解决方案资源管理器中右键单击您的项目，然后选择添加引用...。它应该看起来像: