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Tag: aspnet-core

14 posts · Page 1 of 2

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.

2026-09-21 aspnet-core dotnet-10 logging

How to add the current user id to every log entry in ASP.NET Core

A BeginScope middleware misses the exception handler's error log and the Request finished line. Register an ILogEnricher that reads the user from IHttpContextAccessor, open a scope only when work leaves the request, and watch out for Serilog's AddSerilog silently cancelling enrichment.

2026-09-20 aspnet-core aspnet-core-11 azure

How to keep a database write and an Azure Blob Storage upload consistent in a single ASP.NET Core request

There is no transaction that spans SQL Server and Blob Storage. Upload to a name the database already knows about, commit second, compensate on failure, and let a sweeper clean up the crash window. With the UploadAsync overload that silently turns a conditional create into an overwrite.

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.

2026-08-13 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.

2026-05-28 migration dotnet-framework dotnet-11

Migrate from .NET Framework 4.8 to .NET 11 in 2026

A version-pinned migration playbook for moving a .NET Framework 4.8 codebase to .NET 11 LTS in 2026, covering the SDK-style csproj rewrite, System.Web to ASP.NET Core, WCF, EF6 to EF Core 11, BinaryFormatter removal, AppDomain replacements, and a realistic rollback plan.

2026-04-30 llm ai-agents anthropic-sdk

How to Call the Claude API from a .NET 11 Minimal API with Streaming

Stream Claude responses from an ASP.NET Core 11 minimal API end-to-end: the official Anthropic .NET SDK, TypedResults.ServerSentEvents, SseItem, IAsyncEnumerable, cancellation flow, and the gotchas that buffer your tokens silently. With Claude Sonnet 4.6 and Opus 4.7 examples.

2026-04-28 azure dotnet dotnet-11

How to upload a large file with streaming to Azure Blob Storage

Upload multi-GB files to Azure Blob Storage from .NET 11 without loading them into memory. BlockBlobClient.UploadAsync with StorageTransferOptions, MultipartReader for ASP.NET Core uploads, and the buffering traps that put your payload on the LOH.

2026-04-24 aspnet-core dotnet dotnet-11

How to stream a file from an ASP.NET Core endpoint without buffering

Serve large files from ASP.NET Core 11 without loading them into memory. Three tiers: PhysicalFileResult for on-disk files, Results.Stream for arbitrary streams, and Response.BodyWriter for generated payloads -- with code for each.

2026-04-20 dotnet-11 aspnet-core kestrel

Kestrel starts processing HTTP/3 requests before the SETTINGS frame in .NET 11 Preview 3

.NET 11 Preview 3 lets Kestrel serve HTTP/3 requests before the peer's control stream and SETTINGS frame arrive, shaving handshake latency off the first request on every new QUIC connection.