Asp.net core 重定向到Blazor服务器Azure B2C身份验证中的登录

尝试将未经身份验证的用户重定向到登录页，而不是显示空白索引页

我尝试将app.razor修改为重定向，如下所示：

 <NotAuthorized>
                @if (!context.User.Identity.IsAuthenticated)
                {
                    <RedirectToLogin />
                }
                else
                {
                    <p>
                        You are not authorized to access 
                        this resource.
                    </p>
                }
            </NotAuthorized>

  [CascadingParameter] protected Task<AuthenticationState> AuthStat { get; set; }

    protected async override Task OnInitializedAsync()
    {
        base.OnInitialized();
        var user = (await AuthStat).User;
        if (!user.Identity.IsAuthenticated)
        {
            navMan.NavigateTo($"authentication/login?returnUrl={Uri.EscapeDataString(navMan.Uri)}");
        }
    }

---

如果没有在Blazor服务器端项目中使用Azure B2C身份验证进行身份验证，请有人建议如何将用户重定向到登录页面？

您可以使用以下更改强制用户登录

方法1:

_Cshtml添加以下代码

@using Microsoft.AspNetCore.Authorization
@attribute [Authorize]

App.razor

剃须刀

@身体

我很困惑。你发布了两个MainLayout.razor实际上我在建议两种不同的方法。我已经更新了我的答案，请检查。。我只是想自己解决这个问题。我看到您将

[Authorize]

添加到

\u Host.cshtml

-但对于B2C应用程序，这意味着Blazor路由从未被调用，它总是重定向到B2C登录屏幕，这是一种非常糟糕的用户体验。如果我添加了

[AllowAnonymous]

属性，那么我可以允许访问Blazor页面，但在要求用户登录之前，使用您对

MainLayout

的更改来显示欢迎内容。

@using Microsoft.AspNetCore.Authorization
@attribute [Authorize]

<CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
                <NotAuthorized>
                    <h4>Not authorized.</h4>
                </NotAuthorized>
                <Authorizing>
                    <h4>Authentication in progress...</h4>
                </Authorizing>
            </AuthorizeRouteView>
        </Found>
        <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
        </NotFound>
    </Router>
</CascadingAuthenticationState>

@inherits LayoutComponentBase

<div class="sidebar">
    <NavMenu />
</div>

<div class="main">
    <AuthorizeView>
        <NotAuthorized></NotAuthorized>            
        <Authorized>
            <div class="top-row px-4 auth">
                <LoginDisplay />
                <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
            </div>
            <div class="content px-4">
                @Body
            </div>
        </Authorized>
    </AuthorizeView>
</div>

<environment include="Staging,Production">            
            <component render-mode="ServerPrerendered" type="typeof(App)" />
        </environment>
        <environment include="Development">
            <component render-mode="Server" type="typeof(App)" />
        </environment>

@inject NavigationManager Navigation


@code {  

    protected override Task OnAfterRenderAsync(bool firstRender)
    {
        Navigation.NavigateTo("/AzureADB2C/Account/SignIn");
        return base.OnAfterRenderAsync(firstRender);
    }
}

<div class="main">
    <div class="top-row px-4 auth">
        <LoginDisplay />
        <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
    </div>

    <div class="content px-4">
        <AuthorizeView>
            <Authorized>
                @Body
            </Authorized>
            <NotAuthorized>
                <Blazor_B2C.Pages.RedirectToLogin></Blazor_B2C.Pages.RedirectToLogin>
            </NotAuthorized>
        </AuthorizeView>
    </div>
</div>