C# 发送POST和GET请求

原创已于 2023-06-26 11:38:36 修改 · 4k 阅读

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于 2023-06-19 16:44:05 首次发布

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该文章提供了C#代码示例，详细展示了如何在后台发送POST和GET请求，包括处理JSON数据的POST请求，以及简单的错误处理和日志记录功能。

参考来源：C#后台发送POST和GET请求方法 | IT柚子

命名空间

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

POST

/// &lt;summary>
/// 后台发送POST请求
/// &lt;/summary>
/// &lt;param name="url">服务器地址&lt;/param>
/// &lt;param name="data">发送的数据&lt;/param>
/// &lt;returns>&lt;/returns>
public string HttpPost(string url, string data)
{
    try
    {
        //创建post请求
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "POST";
        request.ContentType = "application/json;charset=UTF-8";
        byte[] payload = Encoding.UTF8.GetBytes(data);
        request.ContentLength = payload.Length;

        //发送post的请求
        Stream writer = request.GetRequestStream();
        writer.Write(payload, 0, payload.Length);
        writer.Close();

        //接受返回来的数据
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream stream = response.GetResponseStream();
        StreamReader reader = new StreamReader(stream, Encoding.UTF8);
        string value = reader.ReadToEnd();

        reader.Close();
        stream.Close();
        response.Close();

        return value;
    }
    catch (Exception)
    {
        return "";
    }
}

上面这个复杂一点的json就不好处理了

推荐用这个


        private static string HttpPost1(string url, string json)
        {
            var request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "application/json;charset=UTF-8";
            byte[] byteData = Encoding.UTF8.GetBytes(json);
            int length = byteData.Length;
            request.ContentLength = length;
            Stream writer = request.GetRequestStream();
            writer.Write(byteData, 0, length);
            writer.Close();
            var response = (HttpWebResponse)request.GetResponse();
            var responseString = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")).ReadToEnd();
           // MessageBox.Show(responseString.ToString());
            return responseString.ToString();

        }

get

  /// &lt;summary>
  /// 后台发送GET请求
  /// &lt;/summary>
  /// &lt;param name="url">服务器地址&lt;/param>
  /// &lt;param name="data">发送的数据&lt;/param>
  /// &lt;returns>&lt;/returns>
  public string HttpGet(string url, string data)
  {
      try
      {
          //创建Get请求
          url = url + (data == "" ? "" : "?") + data;
          HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
          request.Method = "GET";
          request.ContentType = "text/html;charset=UTF-8";

          //接受返回来的数据
          HttpWebResponse response = (HttpWebResponse)request.GetResponse();
          Stream stream = response.GetResponseStream();
          StreamReader streamReader = new StreamReader(stream, Encoding.GetEncoding("utf-8"));
          string retString = streamReader.ReadToEnd();

          streamReader.Close();
          stream.Close();
          response.Close();

          return retString;
      }
      catch (Exception)
      {
          return "";
      }
  }

补充一个log调试


        public void Log(params Object[] message)
        {
            string str = string.Empty;
            if (message == null || message.Length == 0)
            {
                str = "null";
            }
            else
            {
                for (int i = 0; i < message.Length; i++)
                {
                    if (str.Length > 0)
                    {
                        str += " ";
                    }
                    str += message[i];
                }
            }
            Console.WriteLine(str);
            // 写入到log日志文件
            StreamWriter sw = new StreamWriter(@"test.log", true, Encoding.UTF8);
            sw.WriteLine(str);
            sw.Close();
        }