在实体框架CTP5中关闭对象缓存 [英] Turn Off Object Caching in Entity Framework CTP5

问题描述

我在使用CTP 5中的Entity Framework Code First东西搞清楚时遇到了麻烦.它正在缓存对象，但我不希望这样做.例如，我加载一个页面(使用ASP.NET MVC站点)，该页面加载一个对象.然后，我去更改数据库.我重新加载页面，更改没有反映出来.如果我杀死该站点并重新运行，则显然会重新获取.通常，对于一个类型，甚至对于一个特定的查询，我该如何告诉它始终获取新副本.我认为这可能与MergeOption有关，但是我在查找与CTP 5兼容的示例时遇到了麻烦.

I am having trouble figuring out something with the Entity Framework Code First stuff in CTP 5. It is doing caching of objects and I don't want it to. For example, I load a page (working with an ASP.NET MVC site) which loads an object. I then go change the database. I re-load the page and the changes are not reflected. If I kill the site and rerun it then it obviously re-fetches. How do I, either generally for a type, or even for a particular query, tell it to always go get a new copy. I think it might have something to do with MergeOption but I'm having trouble finding examples that work with CTP 5. Thanks.

推荐答案

好，知道了.以下有时会从EF缓存中提取:

Okay, figured it out. The following will sometimes pull from the EF cache:

return (from m in _dataContext.Monkeys
        where m.MonkeyId == monkeyId
        select m).FirstOrDefault();

您可以使用AsNoTracking()绕过更改跟踪/缓存内容:

You can use AsNoTracking() to bypass the change tracking/caching stuff:

return (from m in _dataContext.Monkeys.AsNoTracking()
        where m.MonkeyId == monkeyId
        select m).FirstOrDefault();

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