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Tag: blazor

26 posts · Page 1 of 3

2026-09-24 errors aspnet-core blazor

Fix: Conflicting assets with the same target path after upgrading to the .NET 10 SDK

On the .NET 10 SDK every Microsoft.NET.Sdk.Web project gets StaticWebAssetBasePath=/, so a web app referencing another web app collides. Set the base path on the referenced project. Disabling compression does not help.

2026-09-24 errors blazor aspnetcore

Fix: Unable to find the required 'IAuthenticationService' service with [Authorize(Policy = ...)] in Blazor

A Blazor Web App page with [Authorize] becomes an endpoint the AuthorizationMiddleware checks, and a failed check calls ChallengeAsync, which needs AddAuthentication. Register a real scheme, or pass component endpoints through to AuthorizeRouteView.

2026-09-10 errors blazor blazor-webassembly

Fix: IsAuthenticated is false and RemoteUserAccount is null in Blazor WebAssembly after an MSAL upgrade

Microsoft.Authentication.WebAssembly.Msal 10.0.8, 9.0.16 and 8.0.27 moved to msal.js 4, whose async init races itself. Initialize MSAL once in Program.cs, or pin 10.0.7.

2026-09-10 dotnet-11 aspnetcore signalr

SignalR in .NET 11 RC 1 Swaps an Expiring Token Without Dropping the Connection

The SignalR authentication refresh APIs are finalized in .NET 11 RC 1, with renamed callbacks on HubConnection, a TypeScript client, and Blazor Server circuits that pick up the refreshed ClaimsPrincipal automatically.

2026-09-05 blazor aspnetcore dotnet-11

What is a Blazor render mode and which one runs my component?

A render mode decides where a Razor component executes and whether it is interactive. Here are the four modes in .NET 11, the propagation rules that decide what your component inherits, and the RendererInfo and AssignedRenderMode properties that tell you at runtime which one actually won.

2026-08-24 dotnet maui blazor

.NET MAUI 10.0.100 adds UsePlatformHandler for custom BlazorWebView backends

MAUI 10.0.100 ships MauiBlazorWebViewBuilderExtensions.UsePlatformHandler, a supported seam for replacing BlazorWebViewHandler without reimplementing everything AddMauiBlazorWebView() registers. Two overloads, one ordering trap.

2026-08-16 csharp dotnet dotnet-11

How to download a file from a Blazor component without JavaScript interop

Skip the downloadFileFromStream JS module entirely. Render an anchor with the download attribute pointing at a minimal API endpoint that returns TypedResults.File, or POST a plain HTML form with an AntiforgeryToken. Covers why the download attribute is what stops Blazor's enhanced navigation from swallowing the click, why data-enhance silently discards the file, and the cookie-vs-bearer auth trap.

2026-08-16 csharp dotnet dotnet-11

How to use IDbContextFactory<T> from a singleton service in Blazor

A singleton cannot inject a DbContext, but it can inject IDbContextFactory<T>, because AddDbContextFactory registers the factory as a singleton by default. Create and dispose one context per call, never cache the instance.

2026-08-13 dotnet-11 aspnetcore blazor

Blazor Server Circuits Now Pause Themselves When the Tab Goes Idle

.NET 11 Preview 7 adds an opt-in package that pauses interactive Server circuits when the browser tab is hidden, freeing memory and SignalR connections held by users who are not actually there.

2026-08-13 errors blazor aspnet-core

Fix: 404 Not Found for blazor.server.js after installing a new .NET SDK

blazor.server.js 404s on .NET 10 because the script stopped being an embedded resource. Add RequiresAspNetWebAssets to the host project, or make sure it has a .razor file.