缓存依赖

文件依赖,文件改变,缓存清除

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XmlDocument xmlDoc = new XmlDocument();       public XmlHelper()       {           string xmlPath = HttpRuntime.AppDomainAppPath + "\\Config.xml";           //xmlDoc.Load(xmlPath);           xmlDoc=GetXmlDocument(xmlPath);       }         public static XmlDocument GetXmlDocument(string xmlPath)       {           XmlDocument doc = new XmlDocument();           string key = "config.xml";           Object obj = DataCache.GetCache(key);             if (obj == null)           {               doc.Load(xmlPath);                 DataCache.SetCache(key, doc, new CacheDependency(xmlPath));           }           else           {               doc = (XmlDocument)obj;           }             return doc;         }