using System.IO;
using System.Net;
using System.Text;

public class HttpHelper
{
    public static string Request(string data, string url)
    {
        return Request(Encoding.GetEncoding("UTF-8").GetBytes(data), url);
    }

    public static string Request(byte[] data, string url)
    {
        string result = string.Empty;

        //创建一个客户端的Http请求实例
        HttpWebRequest request = WebRequest.Create(requestUrl) as HttpWebRequest;
        request.ContentType = "application/x-www-form-urlencoded";
        request.Method = "POST";
        request.ContentLength = data.Length;
        Stream requestStream = request.GetRequestStream();
        requestStream.Write(data, 0, data.Length);
        requestStream.Close();

        //获取当前Http请求的响应实例
        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        Stream responseStream = response.GetResponseStream();
        using (StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8")))
        {
            result = reader.ReadToEnd();
        }
        responseStream.Close();

        return result;
    }
}