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dotnet-11

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2026-09-29 blazor dotnet-11 aspnetcore

Blazor Gets Agentic UI Components in .NET 11 RC1: ChatPage, UIAgent, and Tool Approvals

Microsoft.AspNetCore.Components.AI is an experimental Blazor package in .NET 11 RC1 that turns any IChatClient into a streaming chat UI with tool approvals, typed tool rendering, and shared state over AG-UI.

2026-09-29 errors blazor dotnet-watch

Fix: dotnet watch Blazor hot reload WebSocket fails on a custom local domain (403)

Since the September 2026 .NET SDKs (10.0.112, 10.0.401, 11 RC1), dotnet watch rejects browser-refresh WebSockets from unknown origins. Set DOTNET_WATCH_AUTO_RELOAD_WS_ORIGINS to your host name.

2026-09-27 ef-core ef-core-11 sql-server

How to add a unique index on a JSON-mapped property in EF Core 11 (SQL Server and SQLite)

HasIndex(...).IsUnique() on a ToJson() member does not enforce uniqueness in EF Core 11 RC 1: SQL Server drops IsUnique and SQLite indexes the whole document. Expose the JSON value as a computed column and put the unique index on that instead.

2026-09-23 dotnet-10 dotnet-11 configuration

Fix: IConfiguration.Bind does not populate an array or List<T> property from appsettings.json

The binder silently skips array properties without a public setter, get-only IReadOnlyList<T>, fields and init-only members under the source generator, and it appends to defaults instead of replacing them. Measured on .NET 10.0.12 and 11 RC 1.

2026-09-23 system-text-json csharp dotnet-10

How to serialize public fields like Vector3 and Quaternion with System.Text.Json

System.Text.Json writes Vector3 as {} and Quaternion as {"IsIdentity":false} because they store data in public fields. Here is how IncludeFields, a custom converter, a resolver modifier and source generation fix it, measured on .NET 10 and .NET 11 RC 1.

2026-09-22 aspnetcore dotnet-11 minimal-apis

How to disable antiforgery validation for a single minimal API form endpoint in ASP.NET Core 11

Call .DisableAntiforgery() on the one endpoint, or on a MapGroup. In ASP.NET Core 11 that opts out of both the token middleware and the new automatic CSRF check. Measured matrix, precedence traps, and narrower alternatives.

2026-09-20 ef-core ef-core-11 scaffolding

How to add custom table-name pluralization to dotnet ef dbcontext scaffold with IPluralizer

A table named Gas scaffolds to an entity called Ga. Replace the built-in Humanizer pluralizer with your own IPluralizer, register it through IDesignTimeServices in the startup project, and learn why TryAddSingleton silently does nothing there.

2026-09-20 ef-core ef-core-11 concurrency

How to guarantee idempotent message processing with EF Core 11 when two app instances consume the same message

The existence check in your handler is not the guard you think it is. Put a unique index on the inbox table, write the marker in the same SaveChanges as the business change, and let the database pick the winner. Plus the ExecuteUpdate trap that quietly undoes all of it.

2026-09-20 aspnetcore aspnetcore-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.

2026-09-19 ef-core ef-core-11 migrations

How to apply custom naming conventions for primary keys, foreign keys, and indexes in EF Core 11 migrations

Rename every PK_, FK_, AK_ and IX_ that EF Core 11 generates with one IModelFinalizingConvention, keep explicit names winning, stay under the identifier length limit, and avoid the clustered-index rebuild the next migration scaffolds on an existing database.