在 Blazor 组件中获取当前用户 [英] Get Current User in a Blazor component

问题描述

我正在使用 Blazor 和 Windows 身份验证启动一个新站点，并且需要识别查看页面/组件的当前用户.

I'm starting a new site with Blazor and Windows Authentication and need to identify the current user viewing the page/component.

对于 Razor 页面，可以使用 Context.User.Identity.Name 访问当前用户名，但这似乎不适用于 Blazor 组件.我尝试将 HttpContext 注入到组件中，但 Context 在运行时为 null.

For a Razor Page, the current user name can be accessed with Context.User.Identity.Name, but that doesn't seem to work in a Blazor component. I've tried injecting HttpContext into the component but the Context is null at runtime.

作为奖励，我最终希望将其合并到 Startup.cs 中，因此我只需要获取一次用户名，就可以为我的应用程序利用企业用户类(使用 EF Core).也将不胜感激针对该用例量身定制的答案.

As a bonus, I will eventually want to incorporate this into Startup.cs so I only need to get the username once and can leverage a corporate user class (with EF Core) for my applications. Answers tailored to that use case would also be appreciated.

推荐答案

在组件中获取用户的三种可能性(一个页面就是一个组件):

There are three possibilities for getting the user in a component (a page is a component):

1. 注入IHttpContextAccessor并从中访问HttpContext，然后User；需要在Startup.ConfigureServices中注册IHttpContextAccessor，一般使用AddHttpContextAccessor
2. 注入一个 AuthenticationStateProvider 属性，调用 GetAuthenticationStateAsync 并从中获取 User
3. 将您的组件包装在 组件中，声明一个 Task 属性并调用它以获取 User (类似于#2)

1. Inject IHttpContextAccessor and from it access HttpContext and then User; need to register IHttpContextAccessor in Startup.ConfigureServices, normally using AddHttpContextAccessor
2. Inject a AuthenticationStateProvider property, call GetAuthenticationStateAsync and get User from it
3. Wrap your component in a <CascadingAuthenticationState> component, declare a Task<AuthenticationState> property and call it to get the User (similar to #2)

在此处查看更多信息:https://docs.microsoft.com/en-us/aspnet/core/security/blazor.

See more here: https://docs.microsoft.com/en-us/aspnet/core/security/blazor.

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