实体框架IDENTITY_INSERT

Question

数据库中的"类别"表定义如下:

CategoryID - PK ,identity specification ON  (only this column has identity)   
Description  
Title  

我想插入新数据:

Category cat = new Category
{
    Description = "xxx",
    Title = "yyy",
};
if (cat.EntityState == EntityState.Detached)
{
   Articlerctx.AddToCategories(cat);
}
return Articlerctx.SaveChanges();

我收到错误:

当IDENTITY_INSERT设置为OFF时,无法在表'Categories'中为identity列插入显式值.

但我没有插入CategoryID!我希望它能获得自动价值!

Answer 1

你的映射是错误的.在StoreGeneratedPattern上CategoryID 应被设置为Identity,但你必须把它设置为None.修复它.