处理实体框架创建POCO [英] Handle Entity Framework On Create POCO

问题描述

我想看看有没有办法挂接到Entity Framework上下文，所以一旦创建了一个POCO对象就知道了。

I'd like to see if there's a way to hook into the Entity Framework context so I know as soon as it has finished creating a POCO object.

有什么属性我可以使用，例如与[OnDeserializing]？目的是在上下文从数据库获取中创建时，在对象上设置一些值。

Are there any attributes I can use, such as with [OnDeserializing]? The purpose is to set a few values on the object as soon as the context is done creating it from a database fetch.

非常感谢。

推荐答案

将Hook转换为ObjectContext触发的ObjectMaterialized事件。在CTP5中，您需要在DbContext的构造函数中转换DbContext：

Hook into the ObjectMaterialized event fired by ObjectContext. In CTP5, you need to cast your DbContext like so in the constructor for your DbContext:

((IObjectContextAdapter)this).ObjectContext.ObjectMaterialized += 
    this.ObjectContext_OnObjectMaterialized;

如果您没有使用代码优先，则不需要转换。然后实现你的函数 ObjectContext_OnObjectMaterialized（object sender，ObjectMaterializedEventArgs e）。通过EventArgs，您将可以访问刚刚实现的对象。

If you are not using Code First, you don't need to cast. Then implement your function ObjectContext_OnObjectMaterialized(object sender, ObjectMaterializedEventArgs e). Via the EventArgs, you will be able to access your object, which has just been materialized.

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