WebClient保持Session和Cookie(转)-优快云博客

本文介绍了一种自定义HttpWebClient的方法，通过继承WebClient并在其中添加CookieContainer属性来实现在HTTP请求中保持Session和Cookie的功能。这种实现方式适用于需要在多个请求间保留状态信息的场景。

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WebClient不能保持Session和Cookie，但很多情况下需要保持Session和Cookie，经过查看发现只要稍微修改一下就可以达到上述效果。

我实现了一个HttpWebClient，继承自WebClient，其代码如下：

Code
namespace System.Net
{
     public class HttpWebClient : WebClient
    {
         private CookieContainer cookies;

         public HttpWebClient()
        {
             this .cookies = new CookieContainer();
        }

         public HttpWebClient(CookieContainer cookies)
        {
             this .cookies = cookies;
        }

         public CookieContainer Cookies
        {
             get
            {
                 return this .cookies;
            }
             set
            {
                 this .cookies = value;
            }
        }

         protected override WebRequest GetWebRequest(Uri address)
        {
            WebRequest request = base .GetWebRequest(address);

             if (request is HttpWebRequest)
            {
                HttpWebRequest httpRequest = request as HttpWebRequest;
                httpRequest.CookieContainer = cookies;
            }
             return request;
        }
    }