entity-framework-4 - Default Constraints in Entity Framework

Question

Very simple question that NO ONE has directly answered. Is there no way to insert an entity using EF4 that uses the database default constraint and yet allows that field to be updated later? There doesn't seem to be. When I have a date property for instance and want it to use the database default, I seem to have two options:

1) Set the "StoreGeneratedPattern" to "Computed" or "Identity" which prevents me from updating it later.

2) Ignore the database default entirely and set the default value myself.

Neither one of these options will work for me, and this seems to be a huge weakness with the framework. Any ideas? Is this bug resolved in EF5.

Answer 1

不。

相关的 UserVoice 建议。

Answer 2

您可以扩展生成的类并在 patial 类的构造函数中设置默认值。

public partial MyEntityClass MyEntity
{
    public MyEntityClass() 
    {
        this.DefaultValueProperty = defaultValue;
    }
}