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NavigationManager.Navigate throws in OnInitialized if component is static
Is there an existing issue for this?
- [X] I have searched the existing issues
Describe the bug
Consider a Blazor Web App with two components Home ("/") and Login ("/Login").
Home has render mode Interactive Server and Login has render mode Static Server.
If a user is already authenticated and hits https://example.com/Login I want to navigate the user to the Home component.
However, when doing so I get the following exception
This behavior previously worked fine in .NET 7 with hosting model Blazor Server.
Should this be handled differently with Blazor in .NET 8? If yes, how?
Expected Behavior
User should be navigated to the Home component.
Steps To Reproduce
Have a Blazor Web App with Cookie Authentication setup.
Program.cs
builder.Services
.AddRazorComponents()
.AddInteractiveServerComponents();
builder.Services
.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
.AddCookie(options =>
{
options.LoginPath = "/Login";
});
builder.Services.AddAuthorization();
builder.Services.AddCascadingAuthenticationState();
var app = builder.Build();
...
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
app
.MapRazorComponents<App>()
.AddInteractiveServerRenderMode();
app.Run();
App.razor
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<base href="/" />
<link rel="stylesheet" href="app.css" />
<link rel="stylesheet" href="AuthDemo.styles.css" />
<HeadOutlet />
</head>
<body>
<Routes />
<script src="_framework/blazor.web.js"></script>
</body>
</html>
Routes.razor
<Router AppAssembly="typeof(Program).Assembly">
<Found Context="routeData">
<AuthorizeRouteView RouteData="routeData" DefaultLayout="typeof(Layout.MainLayout)" />
<FocusOnNavigate RouteData="routeData" Selector="h1" />
</Found>
</Router>
Exceptions (if any)
Microsoft.AspNetCore.Components.NavigationException: 'Exception_WasThrown'
.NET Version
8.0.201
Anything else?
.NET SDK:
Version: 8.0.201
Commit: 4c2d78f037
Workload version: 8.0.200-manifests.e575128c
Runtime Environment:
OS Name: Windows
OS Version: 10.0.22631
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\8.0.201\
.NET workloads installed:
There are no installed workloads to display.
Host:
Version: 8.0.2
Architecture: x64
Commit: 1381d5ebd2
.NET SDKs installed:
8.0.200 [C:\Program Files\dotnet\sdk]
8.0.201 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.27 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.27 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.27 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.16 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
It seems to work if I use the OnInitializedAsync lifecycle hook.
If this is the correct way to do it feel free to close the issue.
protected override async Task OnInitializedAsync()
{
if (HttpContext.User.Identity?.IsAuthenticated == true)
{
NavigationManager.NavigateTo("/");
await base.OnInitializedAsync();
}
}
@davidjohanssson thanks for contacting us.
That exception is thrown and caught by the framework and is used to signal navigation internally. The only reason you are observing it is because you have enabled breaking on first chance exceptions in the debugger.
