C＃：無法繞過緩存（WebClient）

Question

WebClient Client = new WebClient(); 
Client.CachePolicy = new System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.BypassCache); 

爲什麼上面的代碼實際上並未阻止通過.Net Web Client緩存站點？

Answer 1

string xmlUrl = "http://myserver.com/xmlfile.xml"; 

WebClient client = new WebClient(); 

// prevent file caching by windows 
client.CachePolicy = new System.Net.Cache.RequestCachePolicy(
System.Net.Cache.RequestCacheLevel.NoCacheNoStore 
); 

// read content of file 
Stream rssStream = client.OpenRead(xmlUrl); 

使用不緩存不存儲。

編輯：如果它不工作，那麼嘗試用WebRequest的/ WebResponse類：

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();