EF基础概念篇

EF版本

相关版本特性介绍

EF3.5

基本的对象关系映射，支持DB First 方式（Basic O/RM support with Database First approach.）

EF4.0

支持简单传统CLR对象（Plain old CLR Object），懒加载，可测试的改进，可以自定义代码的生成，支持ModeFirst；
（POCO Support, Lazy loading, testability improvements, customizable code generation and the Model First approach.）

EF4.1

第一次可以在NuGet里面可以下载，简单的数据上下文接口支持，EF4.1.1补丁发布以修复EF4.1中的Bug
（First to available in the NuGet, Simplified DBContext API over ObjectContext, Code First approach. EF 4.1.1 patch released with bug fixing of 4.1.）

EF4.3

支持Code First 数据库迁移特性，EF4.3.1补丁发布以修复EF4.3的Bug

（Code First Migrations feature that allows a database created by Code First to be incrementally changed as your Code First model evolves. EF 4.3.1 patch released with bug fixing of EF 4.3.）

EF5.0

宣布EF开源，支持枚举，表值函数，空间数据类型，多个图标模型，图形化设计界面，引入存储过程，EF Power工具以及各种改进；

（Announced EF as Open Source. Introduced Enum support, table-valued functions, spatial data types, multiple-diagrams per model, coloring of shapes on the design surface and batch import of stored procedures, EF Power Tools and various performance improvements.）

EF 6.0 - Current release

EF 6.0/EF 6.1是Entity Framework最新发布的版本。包含了很多与Code First相关的新特性，如EF设计器，异步查询，异步保存，弹性连接，依赖解决，等等。。。

(EF 6.0/6.1 is the latest release of Entity Framework. It includes many new features related to Code First & EF designer like asynchronous query & save, connection Resiliency, dependency resolution etc.)