本文介绍了解决Entity Framework中因模型变更导致的应用错误问题。针对使用预存数据库时出现的特定错误，提供了一种简单的解决方案：通过在Global.asax文件的Application_Start方法中调用Database.SetInitializer方法来修复。
错误提示：
The model backing the 'xyzContext' context has changed since the database was created. Either manually delete/update the database, or call Database.SetInitializer with an IDatabaseInitializer instance. For example, the RecreateDatabaseIfModelChanges strategy will automatically delete and recreate the database, and optionally seed it with new data.
解决办法：
This is a bug in CTP4 for using EF with pre-existing databases.
You can fix it by calling:
Database.SetInitializer<YourContext>(null);
in the Application_Start method of Global.asa
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