基本的.net中Post请求的写法

这里要注意几个点：

第一就是编码，如果编码不对，容易中文乱码

第二就是ContentType 如果设置不对，有可能连方法都调试不进去（我api用的是MVC的普通controller）

第三就是

paramData参数形式要与ContentType保持一致

           

/// <summary>        /// 发送POST请求        /// </summary>        /// <param name="postUrl">api</param>        /// <param name="paramData">参数，一般是param1=1¶m2=2这种形式</param>        /// <param name="dataEncode">编码</param>        /// <returns></returns>        private string PostWebRequest(string postUrl, string paramData, Encoding dataEncode)        {            string ret = string.Empty;            try            {                byte[] byteArray = dataEncode.GetBytes(paramData); //转化                HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));                webReq.Method = "POST";                webReq.ContentType = "application/x-www-form-urlencoded";                //webReq.ContentType = "application/json";                webReq.ContentLength = byteArray.Length;                Stream newStream = webReq.GetRequestStream();                newStream.Write(byteArray, 0, byteArray.Length);//写入参数                newStream.Close();                HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();                StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);                ret = sr.ReadToEnd();                sr.Close();                response.Close();                newStream.Close();            }            catch (Exception ex)            {                MessageBox.Show(ex.Message);            }            return ret;        }