EF 4.1 CodeFirst with Guid（不是由DB / Store生成）作为PK [英] EF 4.1 CodeFirst with Guid (not generated by DB/Store) as PK

问题描述

我想用客户端生成GUID创建一个模型作为主键。我想要Guid自动生成，但不是在DB上，所以我知道ID之前我坚持，对我的域模型很重要。

I'd like to create a model with a 'client generated' GUID as the primary key. I want the Guid to be auto-generated, but NOT on the DB, so I know the ID before I persist it, important for my domain model.

我如何设置：

class MyEntity {
    public Guid ID { get; set; }
}

所以我可以做...

 var newEntity = new MyEntity();
 transmitIDBeforePersisting(newEntity.ID);
 context.MyEntities.Add(newEntity);
 context.SaveChanges()

如何设置MyEntity.ID，当我打电话给新的，但仍然正常工作作为主键，导航属性等？

How can I setup MyEntity.ID so it is auto-generated when I call new, but still works properly as a Primary Key, with nav properties, etc?

这与使用Guid作为PK与EF4代码第一，但不是由商店/ DB生成。

This is similar to using Guid as PK with EF4 Code First, but NOT generated by the Store/DB.

推荐答案

在构造函数中设置 ID 属性的值，并使用 [DatabaseGenerated（DatabaseGeneratedOption.None）] 属性 ID 属性：

Set the value of the ID property in your constructor, and use the [DatabaseGenerated(DatabaseGeneratedOption.None)] attribute on the ID property:

public class MyEntity 
{        
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public Guid ID { get; set; }

    public MyEntity()
    {
        ID = Guid.NewGuid();
    }
}

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