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Tag: dotnet

134 posts · Page 2 of 14

2026-04-26 mcp ai-agents claude-code

How to Build a Custom MCP Server in C# on .NET 11

Build a working Model Context Protocol server in C# 14 / .NET 11 using the official ModelContextProtocol 1.2 SDK. Covers stdio transport, [McpServerTool] attributes, dependency injection, the stderr logging trap, and registration with Claude Code, Claude Desktop, and VS Code.

2026-04-26 csharp dotnet dotnet-11

How to unit-test code that uses HttpClient

A complete guide to testing HttpClient in .NET 11: why you should not mock HttpClient directly, how to write a stub HttpMessageHandler, swapping the primary handler with IHttpClientFactory, verifying Polly retries, and the WireMock.Net option.

2026-04-25 aspire opentelemetry security

Aspire 13.2.4 Patches CVE-2026-40894: Baggage Header DoS in OpenTelemetry .NET

Aspire 13.2.4 ships an OpenTelemetry bump for CVE-2026-40894, a Gen0 allocation amplification in baggage, B3, and Jaeger propagator parsing. Update OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators to 1.15.3 even if you are not on Aspire.

2026-04-25 dotnet dotnet-11 performance

How to profile a .NET app with dotnet-trace and read the output

A complete guide to profiling .NET 11 apps with dotnet-trace: install, pick the right profile, capture from startup, and read the .nettrace output in PerfView, Visual Studio, Speedscope, or Perfetto.

2026-04-25 csharp dotnet dotnet-11

How to use Channels instead of BlockingCollection in C#

System.Threading.Channels is the async-first replacement for BlockingCollection in .NET 11. This guide shows how to migrate, how to choose bounded vs unbounded, and how to handle backpressure, cancellation, and graceful shutdown without deadlocking.

2026-04-25 csharp dotnet dotnet-11

How to write a custom JsonConverter in System.Text.Json

A complete guide to writing custom JsonConverter<T> for System.Text.Json in .NET 11: when you actually need one, how to navigate Utf8JsonReader correctly, how to handle generics with JsonConverterFactory, and how to stay AOT-friendly.

2026-04-24 dotnet dotnet-10 ubuntu

.NET 10 on Ubuntu 26.04: resolute Container Tags and Native AOT in the Archive

Ubuntu 26.04 Resolute Raccoon ships with .NET 10 in the archive, introduces -resolute container tags to replace -noble, and packages Native AOT tooling via dotnet-sdk-aot-10.0.

2026-04-24 dotnet dotnet-11 csharp

How to Generate Strongly Typed Client Code from an OpenAPI Spec in .NET 11

Use Kiota, Microsoft's official OpenAPI code generator, to produce a fluent, strongly typed C# client from any OpenAPI spec. Step-by-step: install, generate, wire into ASP.NET Core DI, and handle authentication.

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.

2026-04-23 csharp dotnet dotnet-11

How to cancel a long-running Task in C# without deadlocking

Cooperative cancellation with CancellationToken, CancelAsync, Task.WaitAsync, and linked tokens in .NET 11. Plus the blocking patterns that turn a clean cancel into a deadlock.