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

namespace CRM.Core.Common
{
    public static class Utility
    {
        public static string GetData(string Url, string RequestPara)
        {
            RequestPara = RequestPara.IndexOf('?') > -1 ? (RequestPara) : ("?" + RequestPara);

            WebRequest hr = HttpWebRequest.Create(Url + RequestPara);

            //byte[] buf = encoding.GetBytes(RequestPara);
            hr.Method = "GET";

            System.Net.WebResponse response = hr.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string ReturnVal = reader.ReadToEnd();
            reader.Close();
            response.Close();

            return ReturnVal;
        }
        /// <summary>   
        /// 创建POST方式的HTTP请求   
        /// </summary>   
        /// <param name="url">请求的URL</param>   
        /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>  
        /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>  
        /// <returns></returns>   
        public static string HttpPostData(string url, string parameters, Encoding requestEncoding)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }
            if (requestEncoding == null)
            {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request = null;
            request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            //  request.ContentType = "application/json";
            //如果需要POST数据   
            if (!string.IsNullOrEmpty(parameters))
            {
                byte[] data = requestEncoding.GetBytes(parameters.ToString());
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
            }
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                StreamReader reader = new StreamReader(response.GetResponseStream(), requestEncoding);
                string result = reader.ReadToEnd();
                return result;
            }
        }
    }
}