c# - 如何在导航属性上将 IsModified 设置为 false

Question

我有 Article 和 ApplicationUser 模型类:

public class ApplicationUser
{
    ...

}

public class Article
{
    ...

    public ApplicationUser CreatedBy { get; set; }
}

我尝试通过这种方式将 CreatedBy 属性设置为 false:

base.Entry(entity).Property(x => x.CreatedBy).IsModified = false;

但是我得到这个错误:

The property 'CreatedBy' on entity type 'ApplicationUser' is being accessed using the 'Property' method, but is defined in the model as a navigation property. Use either the 'Reference' or 'Collection' method to access navigation properties.

Answer 1

如果我理解正确，文章实体可能看起来像:

public class Article
{
    public int Id { get; set; }

    public string UserID { get; set; }

    // ...

    [ForeignKey("UserID")]
    public ApplicationUser CreatedBy { get; set; }
}

如错误信息所述，CreatedBy 是此处的导航属性。

所以把你的代码改成

Entry(entity).Reference(x => x.CreatedBy).IsModified = false; ,

它可能会按预期工作。