如何禁用Entity Framework 4.3中的模型兼容性检查？ [英] How can I disable model compatibility checking in Entity Framework 4.3?

问题描述

我正在使用EF 4.3，并且有一个上下文需要与使用EF Code First 4.3的另一个库生成的数据库进行通信。上下文抛出一个异常，说明

自
数据库创建以来，支持上下文上下文的模型已更改。考虑使用代码优先迁移来更新
数据库

在EF 4.1中，可以通过删除 IncludeMetadataConvention 从ModelBuilder。但是，在4.3中，这个约定已被弃用，不再有效果。

我如何在EF 4.3生成的数据库中具有EF 4.3上下文交流？由不同的上下文构建？我发现（唯一不太理想）的选项是删除元数据表，从而导致上下文假定数据库未由EF构建。

PS：我知道这种情况可能会引发关于为什么我需要这样做的问题？我知道这远远不是理想的，但放心，这是一个我需要解决的问题，并且有限的选择可以在横向工作。

解决方案

将初始化器设置为 null 将跳过模型兼容性检查。

  Database.SetInitializer< MyContext>（空）; 
  

I'm working with EF 4.3 and have a context which needs to talk to a database which was generated by another library using EF Code First 4.3. The context is throwing an exception stating

The model backing the 'Context' context has changed since the database was created. Consider using Code First Migrations to update the database

In EF 4.1 this could be diabled by removing the IncludeMetadataConvention from the ModelBuilder. However, in 4.3 this convention has been deprecated and no longer has an effect.

How can I have an EF 4.3 context talk to an EF 4.3-generated database built by a different context? The only option I've found (which is far from ideal) is to delete the metadata table, thereby causing both contexts to assume the database was not build by EF.

PS: I know this scenario is likely to raise questions about why I need to do this; I know it's far from ideal, but rest assured it's a problem I need to solve and have limited options to work with laterally.

解决方案

Setting the initializer to null will skip the model compatibility check.

Database.SetInitializer<MyContext>(null);

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