C# 發送Post請求（帶參數）

此處內容傳輸都是用UTF-8編碼

1、不帶參數發送Post請求

/// <summary>
        /// 指定Post地址使用Get 方式獲取全部字符串
        /// </summary>
        /// <param name="url">請求后台地址</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();
            //獲取內容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }

2、帶參數Post請求,指定鍵值對       

/// <summary>
    /// 指定Post地址使用Get 方式獲取全部字符串
    /// </summary>
    /// <param name="url">請求后台地址</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 參數
        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();
        //獲取響應內容
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
        {
            result = reader.ReadToEnd();
        }
        return result;
    }

3、帶參數的Post請求，指定發送字符串內容

/// <summary>
/// 指定Post地址使用Get 方式獲取全部字符串
/// </summary>
/// <param name="url">請求后台地址</param>
/// <param name="content">Post提交數據內容(utf-8編碼的)</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 參數
    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();
    //獲取響應內容
    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
    {
        result = reader.ReadToEnd();
    }
    return result;
}

 轉載方法：

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);
           }

來源：https://www.cnblogs.com/shiyh/p/11168797.html