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Tag: dotnet-11

213 posts · Page 5 of 22

2026-07-10 dotnet dotnet-cli msbuild

What is the difference between dotnet build and dotnet publish?

dotnet build compiles your project for the inner development loop and defaults to Debug. dotnet publish runs the MSBuild Publish target, defaults to Release on net8.0 and later, and packages a deployable folder with web assets, self-contained runtimes, single-file, trimming, and AOT handled. Here is exactly what each one produces and when to reach for it.

2026-07-10 dotnet dotnet-cli dotnet-watch

What is the difference between dotnet watch and dotnet run?

dotnet run builds your project once and launches it. dotnet watch wraps dotnet run in a file watcher: it relaunches or hot reloads the app every time you save a source file. Here is exactly what each one does, what dotnet watch sets that dotnet run does not, and when to reach for which.

2026-07-09 migration aspnetcore dotnet-11

Migrate a minimal API from manual validation checks to built-in validation in ASP.NET Core 11

A step-by-step migration guide for replacing hand-rolled if-checks in ASP.NET Core 11 minimal API handlers with the built-in source-generated DataAnnotations validator: what breaks, which manual rules do and do not port, and how to verify the 400 ProblemDetails contract stays identical.

2026-07-09 migration llm ai-agents

Migrate From the OpenAI SDK to Microsoft.Extensions.AI in a .NET App

A step-by-step checklist for moving a .NET app off the raw OpenAI 2.12 SDK onto the provider-neutral Microsoft.Extensions.AI 10.7 IChatClient. Covers the AsIChatClient bridge, the CompleteChatAsync-to-GetResponseAsync rewrite, streaming, tool calling, DI registration, and the gotchas that bite mid-cutover.

2026-07-09 dotnet trimming native-aot

What is trim-safe code and how do I write it?

Trim-safe code is code the .NET trimmer can statically prove is reachable, so it survives when unused code is removed from a self-contained app. This is the practical guide: turn on the analyzer, drive every IL2xxx warning to zero, annotate reflection with DynamicallyAccessedMembers, propagate RequiresUnreferencedCode to public APIs, and replace unanalyzable patterns with source generators.

2026-07-06 errors dotnet dotnet-11

Fix: "415 Unsupported Media Type" from a minimal API endpoint in ASP.NET Core 11

A minimal API returns 415 when the request Content-Type does not match what the endpoint binds. Send Content-Type: application/json for a body-bound type, or use [FromForm] for form and file uploads.

2026-07-06 errors csharp csharp-14

Fix: CS9035 "Required member 'X' must be set in the object initializer" in C#

CS9035 means a member marked required was not assigned. Set it in the object initializer, or add a constructor annotated with [SetsRequiredMembers] that assigns every required member.

2026-07-03 csharp dotnet dotnet-11

How to customize minimal API validation error responses with IProblemDetailsService in ASP.NET Core 11

Call AddProblemDetails with a CustomizeProblemDetails callback to reshape the 400 that built-in minimal API validation returns in ASP.NET Core 11: add a traceId, rewrite the title, switch 400 to 422, or take full control with a custom IProblemDetailsWriter.

2026-07-03 csharp dotnet dotnet-11

How to set up JWT bearer authentication in a minimal API in ASP.NET Core 11

A complete, working setup for JWT bearer authentication in an ASP.NET Core 11 minimal API: install the package, wire up AddAuthentication().AddJwtBearer(), issue a token, protect endpoints with RequireAuthorization, add role and claim policies, and test the whole thing with dotnet user-jwts.

2026-07-01 csharp dotnet dotnet-11

How to propagate a CancellationToken through async methods in .NET 11

Thread a CancellationToken cleanly through every layer of an async call chain in .NET 11: last-parameter convention, default values, linked tokens, ASP.NET Core RequestAborted, and the CA2016 analyzer that catches the ones you drop.