本文实例讲述了基于WebClient实现Http协议的Post与Get对网站进行模拟登陆和浏览的方法。分享给大家供大家参考。具体分析如下：

一、问题：

我们在一些场合经常需要模拟浏览器进行一些操作，比如模拟投票，或者模拟点击，或者Web游戏外挂。

二、解决方法：

C#中封装好的WebClient可以在某些要求不算高的场景实现Http的Post和Get。具体请见如下代码：

namespace TestCNM
{
    public class WebClientExt
    {
        public string Get(string Url,string Referer, Encoding Encoder,ref string CookieStr)
        {
            string result = \"\";
 
            WebClient myClient = new WebClient();
            myClient.Headers.Add(\"Accept: */*\");
            myClient.Headers.Add(\"User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET4.0E; .NET4.0C; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; SE 2.X MetaSr 1.0)\");
            myClient.Headers.Add(\"Accept-Language: zh-cn\");
            myClient.Headers.Add(\"Content-Type: multipart/form-data\");
            myClient.Headers.Add(\"Accept-Encoding: gzip, deflate\");
            myClient.Headers.Add(\"Cache-Control: no-cache\");
            if (CookieStr != \"\")
            {
                myClient.Headers.Add(CookieStr);
            }
            myClient.Encoding = Encoder;
            result = myClient.DownloadString(Url);
            if (CookieStr == \"\")
            {
                CookieStr = myClient.ResponseHeaders[\"Set-Cookie\"].ToString();
                CookieStr = GetCookie(CookieStr);
            }
            return result;
        }
        public string Post(string Url, string Referer, Encoding Encoder, ref string CookieStr, string Data)
        {
            string result = \"\";
 
            WebClient myClient = new WebClient();
            myClient.Headers.Add(\"Accept: */*\");
            myClient.Headers.Add(\"User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET4.0E; .NET4.0C; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; SE 2.X MetaSr 1.0)\");
            myClient.Headers.Add(\"Accept-Language: zh-cn\");
            myClient.Headers.Add(\"Content-Type: multipart/form-data\");
            myClient.Headers.Add(\"Accept-Encoding: gzip, deflate\");
            myClient.Headers.Add(\"Cache-Control: no-cache\");
            if (CookieStr != \"\")
            {
                myClient.Headers.Add(CookieStr);
            }
            myClient.Encoding = Encoder;
            result = myClient.UploadString(Url, Data);
            if (CookieStr == \"\")
            {
                CookieStr = myClient.ResponseHeaders[\"Set-Cookie\"].ToString();
                CookieStr = GetCookie(CookieStr);
            }
            return result;
        }
        private string GetCookie(string CookieStr)
        {
            string result = \"\";
 
            string[] myArray = CookieStr.Split(\',\');
            if (myArray.Count() > 0)
            {
                result = \"Cookie: \";
                foreach (var str in myArray)
                {
                    string[] CookieArray = str.Split(\';\');
                    result += CookieArray[0].Trim();
                    result += \"; \";
                }
                result = result.Substring(0, result.Length - 2);
            }
            return result;
        }
    }
}