C# 使用HttpWebRequest Post

1.代码

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            byte[] data=Encoding.ASCII.GetBytes(String.Format("id={0}&balance={1}",id,balance));
            request.ContentLength = data.Length;
            request.GetRequestStream().Write(data, 0, data.Length);
            request.GetRequestStream().Flush();
            request.GetRequestStream().Close();
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader sr =new StreamReader( response.GetResponseStream() );

2.注意

有因为POST的数据格式有xml，json，form等格式，为了让服务器后台明确数据的格式，最好指明ContentType，否则可能出现服务器接受不到参数

3.附：

form表单格式：application/x-www-form-urlencoded

json格式：json/application

xml格式：text/xml