c# - 具有 2 个兼容类的属性

Question

许可

public enum PermissionType
{
    Read = 0,
    Write = 1
}

public class Permission
{
    public virtual PermissionType? Type { get; set; }
}

public class PermissionCreate : Permission
{
    [Required]
    [Range(0, 1)]
    public override PermissionType? Type { get; set; }
}

类别

public class Category
{
    public virtual int? Id { get; set; }
    public virtual string Name { get; set; }
    public virtual Permission Permission { get; set; }
}

public class CategoryCreate : Category
{
    [Required]
    public override string Name { get; set; }
    [Required]
    public override PermissionCreate Permission { get; set; }
}

行 public override PermissionCreate Permission { get;放; } 抛出一个错误，因为它需要匹配重写的成员类型。有没有办法用 Permission 和 PermissionCreate 覆盖属性，因为它们是兼容的？

Answer 1

由于您的 PermissionCreate 类已经派生自 Permission:

public class PermissionCreate : Permission

那么您已经可以将 PermissionCreate 对象分配给您的 Permission 属性。

但是，派生类必须与父类完全匹配。所以如果你这样做:

public class CategoryCreate : Category
{
    [Required]
    public override string Name { get; set; }
    [Required]
    public override Permission Permission { get; set; }
}

然后你可以这样做:

var test = new CategoryCreate { Permission = new PermissionCreate() };