一、C#、Asp.net 下使用WebClient Get Post 同步 非同步請求，直接貼程式碼

1、通用Http類

using System;
using System.Globalization;
using System.Net;
using System.Text;

namespace Test
{
    public class HttpCommon
    {
        /// <summary>
        /// Http同步Get同步請求
        /// </summary>
        /// <param name="url">Url地址</param>
        /// <param name="encode">編碼(預設UTF8)</param>
        /// <returns></returns>
        public static string HttpGet(string url, Encoding encode = null)
        {
            string result;

            try
            {
                var webClient = new WebClient { Encoding = Encoding.UTF8 };

                if (encode != null)
                    webClient.Encoding = encode;

                result = webClient.DownloadString(url);
            }
            catch (Exception ex)
            {
                result = ex.Message;
            }

            return result;
        }

        /// <summary>
        /// Http同步Get非同步請求
        /// </summary>
        /// <param name="url">Url地址</param>
        /// <param name="callBackDownStringCompleted">回撥事件</param>
        /// <param name="encode">編碼(預設UTF8)</param>
        public static void HttpGetAsync(string url,
            DownloadStringCompletedEventHandler callBackDownStringCompleted = null, Encoding encode = null)
        {
            var webClient = new WebClient { Encoding = Encoding.UTF8 };

            if (encode != null)
                webClient.Encoding = encode;

            if (callBackDownStringCompleted != null)
                webClient.DownloadStringCompleted += callBackDownStringCompleted;

            webClient.DownloadStringAsync(new Uri(url));
        }

        /// <summary>
        ///  Http同步Post同步請求
        /// </summary>
        /// <param name="url">Url地址</param>
        /// <param name="postStr">請求Url資料</param>
        /// <param name="encode">編碼(預設UTF8)</param>
        /// <returns></returns>
        public static string HttpPost(string url, string postStr = "", Encoding encode = null)
        {
            string result;

            try
            {
                var webClient = new WebClient { Encoding = Encoding.UTF8 };

                if (encode != null)
                    webClient.Encoding = encode;

                var sendData = Encoding.GetEncoding("GB2312").GetBytes(postStr);

                webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                webClient.Headers.Add("ContentLength", sendData.Length.ToString(CultureInfo.InvariantCulture));

                var readData = webClient.UploadData(url, "POST", sendData);

                result = Encoding.GetEncoding("GB2312").GetString(readData);

            }
            catch (Exception ex)
            {
                result = ex.Message;
            }

            return result;
        }

        /// <summary>
        /// Http同步Post非同步請求
        /// </summary>
        /// <param name="url">Url地址</param>
        /// <param name="postStr">請求Url資料</param>
        /// <param name="callBackUploadDataCompleted">回撥事件</param>
        /// <param name="encode"></param>
        public static void HttpPostAsync(string url, string postStr = "",
            UploadDataCompletedEventHandler callBackUploadDataCompleted = null, Encoding encode = null)
        {
            var webClient = new WebClient { Encoding = Encoding.UTF8 };

            if (encode != null)
                webClient.Encoding = encode;

            var sendData = Encoding.GetEncoding("GB2312").GetBytes(postStr);

            webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            webClient.Headers.Add("ContentLength", sendData.Length.ToString(CultureInfo.InvariantCulture));

            if (callBackUploadDataCompleted != null)
                webClient.UploadDataCompleted += callBackUploadDataCompleted;

            webClient.UploadDataAsync(new Uri(url), "POST", sendData);
        }
    }
}
 

2、頁面請求類

using System;
using System.Net;
using System.Text;
using System.Web.UI;

namespace Test
{
    public partial class WebForm3 : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Response.Write(HttpCommon.HttpGet("http://localhost:14954/WebForm4.aspx"));                          //Get同步
            HttpCommon.HttpGetAsync("http://localhost:14954/WebForm4.aspx");                                     //Get非同步
            HttpCommon.HttpGetAsync("http://localhost:14954/WebForm4.aspx", DownStringCompleted);                //Get非同步回撥

            Response.Write(HttpCommon.HttpPost("http://localhost:14954/WebForm4.aspx", "post=POST"));            //Post同步
            HttpCommon.HttpPostAsync("http://localhost:14954/WebForm4.aspx", "post=POST");                       //Post非同步
            HttpCommon.HttpPostAsync("http://localhost:14954/WebForm4.aspx", "post=POST", UploadDataCompleted);  //Post非同步回撥
        }

        private void DownStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            Response.Write(e.Result);
        }

        private void UploadDataCompleted(object sender, UploadDataCompletedEventArgs e)
        {
            Response.Write(Encoding.GetEncoding("GB2312").GetString(e.Result));
        }
    }
}