c# - 如何从访问掩码中读取访问权限？

Question

用户可以拥有以下访问权限:

Read = 1
Create = 2
Edit = 4
Delete = 8
Publish = 16
Administer = 32

当访问权限保存在数据库中时，只有一个数字用于表示该用户的所有访问权限。

例如

3 = Read + Create
25 = Read + Delete + Publish

如何获得给定号码(访问掩码)的所有访问权限？

如有任何帮助，我们将不胜感激!

Answer 1

[Flags]
public enum MyFlags
{
    Read = 1,
    Create = 2,
    Edit = 4,
    Delete = 8,
    Publish = 16,
    Administer = 32,
}

声明

MyFlags readCreate = MyFlags.Read | MyFlags.Create;

测试

bool hasRead = (readCreate & MyFlags.Read) == MyFlags.Read;
bool hasEdit = (readCreate & MyFlags.Edit) == MyFlags.Edit;