用System.Web.Caching.Cache保存数据类的缓存

/// The DataProvider class contains a single method, Instance(), which returns an instance of the  /// user-specified data provider class.  ///  public class DataProvider  {   public static IDataProvider Instance()   {    //use the cache because the reflection used later is expensive    Cache cache = System.Web.HttpContext.Current.Cache;

   if ( cache["IDataProvider"] == null )    {     //get the assembly path and class name from web.config     String prefix = "";     NameValueCollection context =

(NameValueCollection)ConfigurationSettings.GetConfig("appSettings");     if (context == null)     {      //can not get settings      return null;     }

    String assemblyPath = context[prefix +

"DataProviderAssemblyPath"];     String className = context[prefix +

"DataProviderClassName"];

    // assemblyPath presented in virtual form, must convert to

physical path     assemblyPath =

HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath + "/bin/" +

assemblyPath);     

    // Uuse reflection to store the constructor of the class

that implements IWebForumDataProvider     try     {      cache.Insert( "IDataProvider", Assembly.LoadFrom(

assemblyPath).GetType( className ).GetConstructor(new Type[0]), new CacheDependency(

assemblyPath ) );     }     catch (Exception)     {

     // could not locate DLL file      HttpContext.Current.Response.Write("<b>ERROR:</b>

Could not locate file: <code>" + assemblyPath + "</code> or could not locate class <code>" +

className + "</code> in file.");      HttpContext.Current.Response.End();     }    }    return (IDataProvider)( 

((ConstructorInfo)cache["IDataProvider"]).Invoke(null) );   }  }

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