C#请求网页如何实现No-Cache方式

C#请求网页怎么实现No-Cache方式？
C++这么写的，那C#呢
HINTERNET hHttp = InternetOpenUrl(hSession, url, NULL, 0, INTERNET_FLAG_DONT_CACHE, 0);

C#怎样no-cache?
req = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
res = (System.Net.HttpWebResponse)req.GetResponse();

------解决方案--------------------

C# code


public static WebResponse GetResponseNoCache(Uri uri)
{
        // Set a default policy level for the "http:" and "https" schemes.
        HttpRequestCachePolicy policy = new HttpRequestCachePolicy(HttpRequestCacheLevel.Default);
        HttpWebRequest.DefaultCachePolicy = policy;
        // Create the request.
        WebRequest request = WebRequest.Create(uri);
        // Define a cache policy for this request only. 
        HttpRequestCachePolicy noCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
        request.CachePolicy = noCachePolicy;
        WebResponse response = request.GetResponse();
        Console.WriteLine("IsFromCache? {0}", response.IsFromCache);            
        return response;
}

C#请求网页如何实现No-Cache方式

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