微软的免费开源项目“企业库 4.0”，支持.net Framework 3.5

很好的项目范例，并且可以用在自己的项目中

Enterprise Library is a collection of reusable application blocks designed to assist developers with common enterprise development challenges. This release includes: Caching, Cryptography, Data Access, Exception Handling, Logging, Policy Injection, Security, Validation, and Unity Application Blocks.

企业库（Enterprise Library）是一个用来协助开发者完成一般企业开发要求的，可重用的应用程序块的集合 ，2008年5月发布的4.0 release 版包括：

Caching Blocks;

Cryptography Blocks;

Data Access Blocks;

Excepting Handing Blocks;

Logging Blocks;

Policy Injection Blocks;

Security Blocks;

Validation Blocks;

Unity Application Blocks;

这个Release版本包括以下特性：

• Support for Visual Studio 2008.
• Integration with the Unity dependency injection container.
• WMI2 support and improved instrumentation.
• Support for pluggable cache managers.
• Performance improvements.

下载地址：下载Enterprise Library 4.0 - May 2008