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C# 发送Post请求（带参数）

来源：网络整理时间：2023/2/14 0:47:42 共 3703 浏览

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);
                }

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