一个角色的共享初始化属性和方法之间的属性 [英] Sharing initialisation of a roles attribute between the attribute and methods

问题描述

我有一个权限属性，该属性花费的角色枚举值的列表：

I have a permissions attribute which takes a list of enum values for roles:

    [CheckRoles(SystemRole.ID.Admin, SystemRole.ID.User)]
    public class MyController : Controller
    {
            ....
    }

不过，在code的其他部分，我想检查，如果用户在这些角色，这样我就可以去到正确的页面。因此，code看起来是这样的：

However, in other parts of the code I would like to check if the user is in any of these roles, so I can go to the correct page. So the code looks something like:

if (roles.IsInAnyRoles(user, SystemRole.ID.Admin, SystemRole.ID.User)
{
    ... Do something in MyController ...
}

您可以在这里看到的重复。我真的希望有一个变量或初始化器列表或东西两个角色，我可以传递给属性和方法两者。创建一个常量数组不起作用。是否有这样做的一种方式？我可以在阵列存储初始化器不知何故？

You can see the repetition here. I really want to have the two roles in a variable or initialiser list or something, that I can pass to both the Attribute and the method. Creating a const array doesn't work. Is there a way of doing this? Can I store the array initialiser somehow?

任何帮助将大大AP preciated！

Any help would be greatly appreciated!

更新

我所作出的角色枚举int类型的标志枚举（并给予适当的项目值）。这意味着我可以或值加在一起给一个单一的，恒定值。
我现在可以使用恒定的值在属性，并在方法。
由于下面丹尼臣。

I have made the roles enum int a Flags enum (and given the items appropriate values). This means I can or the values together to give a single, constant value. I can now use that constant value in the Attribute, and in methods. Thanks to Danny Chen below.

推荐答案

在我的真实项目经验，我想这样定义的角色;

In my real project experiences, I'd like to define roles like this;

[Flags]
public enum Role
{
   Staff = 0,
   Supervisor = 1,
   Manager = 2,
   Admin = 4,
   HelpDesk = 8 
}

的原因是，一个帐户往往有几个角色关联，例如有人是Bob的主管，也是他就是IT部门的经理。在这种情况下，他的作用是 Role.Supervisor | Role.Manager ，这样他就可以使用提供Role.Supervisor所有功能（如批准鲍勃的离开要求），同时他可以批准离开所有IT部门人员的请求。操作如下：

The reason is that one account often has a few roles associated, e.g. someone is a supervisor of Bob, also he is the manager of IT department. In this case his role is Role.Supervisor | Role.Manager, so that he could use all functions provided to Role.Supervisor (such as approving Bob's leaving request), meanwhile he can approve leaving requests from all IT department staff. The action looks like:

[CheckRole(Role.Supervisor, Role.Manager)]
public ActionResult ApproveLeavingRequest()
{
    //the roles in the constructor of CheckRoleAttribute are OR related
}

[CheckRole(Role.Manager|Role.Supervisor, Role.Admin)]
public ActionRequest ModifySystemSettings()
{
    //this method is provided to a small group of people
    //those who is a manager and a supervisor
    //or he is an admin
}

[CheckRole(Role.Manager|Role.Supervisor|Role.Admin)] 
           //maybe we need to add Role.Boss into the system :)
public ActionRequest IncreasePay()
{
    //only the boss account can invoke this method
}

希望这有助于。

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