C#发送Get、Post请求(带参数)

Get请求

1.简单发送Get请求

/// <summary>
/// 指定Url地址使用Get 方式获取全部字符串
/// </summary>
/// <param name="url">请求链接地址</param>
/// <returns></returns>
public static string Get(string url)
{
   string result = "";
   HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
   HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
   Stream stream = resp.GetResponseStream();
   try
   {
       //获取内容
       using (StreamReader reader = new StreamReader(stream))
       {
           result = reader.ReadToEnd();
       }
   }
   finally
   {
       stream.Close();
   }
   return result;
}

2.带请求参数的Get方法

/// <summary>
/// 发送Get请求
/// </summary>
/// <param name="url">地址</param>
/// <param name="dic">请求参数定义</param>
/// <returns></returns>
public static string Get(string url, Dictionary<string, string> dic)
{
   string result = "";
   StringBuilder builder = new StringBuilder();
   builder.Append(url);
   if (dic.Count > 0)
   {
       builder.Append("?");
       int i = 0;
       foreach (var item in dic)
       {
           if (i > 0)
               builder.Append("&");
           builder.AppendFormat("{0}={1}", item.Key, item.Value);
           i++;
       }
   }
   HttpWebRequest req = (HttpWebRequest)WebRequest.Create(builder.ToString());
   //添加参数
   HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
   Stream stream = resp.GetResponseStream();
   try
   {
       //获取内容
       using (StreamReader reader = new StreamReader(stream))
       {
           result = reader.ReadToEnd();
       }
   }
   finally
   {
       stream.Close();
   }
   return result;
}

3.自定义指定Http请求头，自定义指定编码解析返回结果

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "GET";
req.Headers["Accept-Language"] = "zh-CN,zh;q=0.8";
req.Referer = "https://www.baidu.com/";
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
string result = "";
//注意，此处使用的编码是：gb2312
//using (StreamReader reader = new StreamReader(stream, Encoding.Default))
using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("gb2312")))
{
   result = reader.ReadToEnd();
}

Post请求

此处内容传输都是用UTF-8编码

1.不带参数发送Post请求

       /// <summary>
       /// 指定Post地址使用Get 方式获取全部字符串
       /// </summary>
       /// <param name="url">请求后台地址</param>
       /// <returns></returns>
       public static string Post(string url)
       {
           string result = "";
           HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
           req.Method = "POST";
           HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
           Stream stream = resp.GetResponseStream();
           //获取内容
           using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
           {
               result = reader.ReadToEnd();
           }
           return result;
       }

2.带参数Post请求,指定键值对

       /// <summary>
       /// 指定Post地址使用Get 方式获取全部字符串
       /// </summary>
       /// <param name="url">请求后台地址</param>
       /// <returns></returns>
       public static string Post(string url,Dictionary<string,string> dic)
       {
           string result = "";
           HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
           req.Method = "POST";
           req.ContentType = "application/x-www-form-urlencoded";
           #region 添加Post 参数
           StringBuilder builder = new StringBuilder();
           int i = 0;
           foreach (var item in dic)
           {
               if (i > 0)
                   builder.Append("&");
               builder.AppendFormat("{0}={1}", item.Key, item.Value);
               i++;
           }
           byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
           req.ContentLength = data.Length;
           using (Stream reqStream = req.GetRequestStream())
           {
               reqStream.Write(data, 0, data.Length);
               reqStream.Close();
           }
           #endregion
           HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
           Stream stream = resp.GetResponseStream();
           //获取响应内容
           using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
           {
               result = reader.ReadToEnd();
           }
           return result;
       }

3.带参数的Post请求，指定发送字符串内容

/// <summary>
/// 指定Post地址使用Get 方式获取全部字符串
/// </summary>
/// <param name="url">请求后台地址</param>
/// <param name="content">Post提交数据内容(utf-8编码的)</param>
/// <returns></returns>
public static string Post(string url, string content)
{
   string result = "";
   HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
   req.Method = "POST";
   req.ContentType = "application/x-www-form-urlencoded";

#region 添加Post 参数
   byte[] data = Encoding.UTF8.GetBytes(content);
   req.ContentLength = data.Length;
   using (Stream reqStream = req.GetRequestStream())
   {
       reqStream.Write(data, 0, data.Length);
       reqStream.Close();
   }
   #endregion

HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
   Stream stream = resp.GetResponseStream();
   //获取响应内容
   using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
   {
       result = reader.ReadToEnd();
   }
   return result;
}

转载方法：

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://fanyi.baidu.com/transcontent");
           Encoding encoding = Encoding.UTF8;
           string param = "ie=utf-8&source=txt&query=hello&t=1327829764203&token=8a7dcbacb3ed72cad9f3fb079809a127&from=auto&to=auto";
           //encoding.GetBytes(postData);
           byte[] bs = Encoding.ASCII.GetBytes(param);
           string responseData = String.Empty;            
           req.Method = "POST";
           req.ContentType = "application/x-www-form-urlencoded";
           req.ContentLength = bs.Length;
           using (Stream reqStream = req.GetRequestStream())
           {
               reqStream.Write(bs, 0, bs.Length);
               reqStream.Close();
           }
           using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
           {
               using (StreamReader reader = new StreamReader(response.GetResponseStream(),encoding))
               {
                   responseData = reader.ReadToEnd().ToString();
               }
               context.Response.Write(responseData);
           }

来源：https://blog.csdn.net/u011127019/article/details/53021164