Linq Context对象如何返回新添加对象的主键 [英] How Linq Context object return primary key of newly added object

问题描述

objectContext.Catalog.AddObject(catalog);

            return catalog.CatalogId;

上面的代码段是在存储库"层中编写的，并添加了目录对象.我想将一些整数值返回给业务层中的调用函数.但是我想不调用而做:

Above code snippet is written in Repository layer and adds catalog object. I want to return some integer value back to the calling function which is in Business layer. But i want to do it without calling:

objectContext.SaveChanges();

catalog.CatalogId是表中的主键，它是一个标识字段，并设置为自动递增.

catalog.CatalogId is primary key in the table which is an identity field and set to auto increment.

推荐答案

在插入实体后，您的实体ID(在您的情况下为"CatalogId")将具有正确的值，并且您需要先调用SaveChanges()方法才能使用它.

Hi,

Your entity id, in your case "CatalogId" will have right value after inserting the entity and you need to call SaveChanges() method before you want to use it.

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