如何检查用户是否在 Action 中获得授权

本文介绍了如何检查用户是否在 Action 中获得授权的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

通常我使用 [Authorize] 保护我的操作，但这次我需要检查用户是否在操作中获得授权.

Usually I protect my Actions with [Authorize] but this time I need to check if a user is authorized inside the action.

例如

if(userIsAuthorized) { //do stuff } else { //return to login page }

我相信我正在使用表单身份验证"

I believe I am using 'Forms Authentication'

这个问题有点类似于 this 但给出的答案似乎都不起作用.

This question is kind of similar to this but none of the answers given seemed to work.

我已经做了更多的挖掘 - 似乎如果我在具有 [Authorize] 的 Action 上设置断点，User.Identity 已设置，但在没有它的 Actions 上，User.Identity为空，即使我已登录

I have done some more digging- it seems if I breakpoint on an Action that has [Authorize], the User.Identity is set, but on Actions without it, the User.Identity is empty, even if I am logged in

推荐答案

如果只想知道用户是否登录:

If you just want to know if the user is logged in:

if (User.Identity.IsAuthenticated) { ... }

如果您正在尝试做任何特定于角色的事情:

If you are trying to do anything role-specific:

if (User.IsInRole("Administrators")) { ... }

User 实例是 Controller 类的公共属性，因此您始终可以从您编写的控制器访问它.如果没有用户登录，您应该为 User 设置一个 GenericPrincipal，为 User.Identity 设置一个 GenericIdentity，所以不用担心检查空值.

The User instance is a public property of the Controller class, so you always have access to it from a Controller you write. If no user is logged in you should have a GenericPrincipal for the User and a GenericIdentity for the User.Identity, so don't worry about checking for nulls.