实现Entity Framework的二级缓存例子

Tracing and Caching Provider Wrappers for Entity Framework is a sample which demonstrates how to implement wrapping providers which add interesting functionality to an EF application. Included are: EFProviderWrapperToolkit - common toolkit for writing provider wrappers. EFCachingProvider - provides caching of LINQ and ESQL query results EFCachingProvider.Web - provides caching in ASP.NET environment. EFTracingProvider - enables tracing (logging) of SQL commands Other projects: AspNetCachingDemo - demonstrates using tracing and caching in ASP.NET application using Entity Data Source ConfigOnlyInjection - explains injecting tracing behavior into an application by changing App.config and ssdl file EFProviderWrapperDemo - couple of end-to-end demos of using tracing and caching providers. EFCachingProvider.Tests - unit tests for in-memory cache implementation NorthwindEF - NorthwindEF model used by the samples The sample works with Entity Framework 4.0. What is new in .NET 4.0 version =============================== 1. Upgraded all projects to .NET 4.0 and retargetted assemblies to use .NET Framework 4 Client Profile 2. Removed reflection-based code to invoke CreateCommandDefinition() 3. Moved AspNetCache to a separate assembly (which depends on .NET Framework 4 Extended Profile) 4. Added wrappers for DbProviderManifest: public override bool SupportsEscapingLikeArgument(out char escapeCharacter) public override string EscapeLikeArgument(string argument) DbProviderServices: protected override void DbCreateDatabase(DbConnection connection, int? commandTimeout, StoreItemCollection storeItemCollection) protected override bool DbDatabaseExists(DbConnection connection, int? commandTimeout, StoreItemCollection storeItemCollection) protected override void DbDeleteDatabase(DbConnection connection, int? commandTimeout, StoreItemCollection storeItemCollection) protected override string DbCreateDatabaseScript(string providerManifestToken, StoreItemCollection storeItemCollection) 5. Wrappers now work in partial trust - check out AspNetCachingDemo 6. Removed Velocity adapter and the demo. 7. Recreated sample models using edmx (instead of explicit csdl/ssdl/msl) 8. Removed the need to explicitly install the database in SQL Server - instead using |DataDirectory| and mdf files local to the project.