ADO.NET实体框架的实体侦听器

http://msdn.microsoft.com/en-us/library/cc716714.aspx

wayback machine here

public partial class MyEntity
{
    //Before value changes
    partial void OnMyPropertyChanging(int value)
    {
        //Your code here
    }

    //After value changes
    partial void OnMyPropertyChanged()
    {
        //Your code here
    }
}

public partial class MyContext
{
    partial void OnContextCreated()
    {
        this.SavingChanges += new EventHandler(OnSavingChanges);
    }

    private void OnSavingChanges(object sender, EventArgs args)
    {
        //use ObjectStateManager for entity states
    }
}