WebClient: Handling Cookies

WebClient class is very useful when you need to download or upload date from or to the Web. However, when you need to make a sequence of calls you find that WebClient does not preserve cookies set by the server between requests. Fortunately, WebClient gives you an opportunity to handle cookies by yourself.

在从Web服务器上下载文件或者往上传数据的时候，WebClient类是非常有用的。不过当你需要跟服务器做一系列的交互时会发现WebClient类根本不处理Cookie。 幸好，WebClient类提供了一个让你自己处理Cookie的机会。

The very simple solution is to override GetWebRequest method of the WebClient class and set CookieContainer property.
最简单的解决方法就是重载WebClient的GetWebRequest方法来手动设置CookieContainer属性：

Here is my implementation:
解决方法如下：

    public class CookieAwareWebClient : WebClient
    {

        private CookieContainer m_container = new CookieContainer();

        protected override WebRequest GetWebRequest(Uri address)
        {
            WebRequest request = base.GetWebRequest(address);
            if (request is HttpWebRequest)
            {
                (request as HttpWebRequest).CookieContainer = m_container;
            }
            return request;
        }
    }

转载自: It Could Be Done!