Browse All .NET Content (280)

Joshua Yue introduces new experimental routing and failover primitives in Microsoft.Extensions.AI, showing how .NET apps can route chat requests across multiple model/providers, do content-based semantic routing with embeddings, and fail over safely when a client fails—while keeping request options and streaming behavior predictable.

Lily Du explains how to build Microsoft Teams agents that participate in busy chats and channels without adding noise, using lightweight interaction patterns like emoji reactions, threaded replies, and quoted replies.

Authorised Territory demonstrates how to configure GitHub Copilot in Visual Studio 2026 (18.9.0), focusing on adding Ollama-backed local models and tuning the model “thinking effort” setting to control how much reasoning the model applies during responses.

Visual Studio Code shows how VS Code dictation can detect your language and convert speech to text using a local model, and where you can use it across the editor experience.

daisami shows how to combine Microsoft Agent Framework Harness with the Agent Governance Toolkit (AGT) to enforce tool-call policy for a file-access agent. The walkthrough uses a YAML allow/deny policy, function-call middleware, and audit events so risky operations (write/delete/replace) are blocked at execution time, not just in prompts.

Wendy Breiding explains how to keep GitHub Copilot (and other frontier coding models) effective by treating repository instructions as a high-signal budget: document the local facts, constraints, and validation commands the model can’t infer, and remove vague “prompt folklore” that adds noise.

Visual Studio Code highlights improvements to the Markdown editing experience in VS Code, focusing on making it easier to work with Markdown files directly in the editor.

Dominik Titl presents a .NET MAUI Community Standup session on a developer tool that combines app inspection, layout analysis, and test recording with GitHub Copilot Canvas, showing how teams can capture evidence from real app interactions and use it to create repeatable tests and diagnose failures.

Chris Klug presents a .NET Data Community Standup session focused on practical ways to use Entity Framework Core interceptors, showing how interception hooks can be applied around EF Core’s database operations for cross-cutting concerns and diagnostics.

sbaynes announces MAI-Code-1.1-Flash, a new coding model now running in GitHub Copilot, focused on better code quality and lower cost. The post highlights token-efficiency gains, benchmark improvements in Copilot CLI and .NET tasks, and production metrics like code survival and return visits.

The .NET Team announces .NET 11 Preview 7 and highlights what’s new across the runtime, SDK, libraries, and app frameworks, with links to detailed release notes for C#, ASP.NET Core (including Blazor), .NET MAUI, EF Core, F#, and Windows Forms.

Rahul Bhandari and Tara Overfield recap the August 2026 servicing releases for .NET and .NET Framework, highlighting security and non-security fixes, the list of addressed CVEs, and where to find release notes, installers, container images, Linux packages, and known issues for supported .NET versions.

Harshada Hole introduces first-class Git submodule support in Visual Studio 18.9, showing how submodules now appear in the Git UI and how you can add, update, and remove them without switching to a terminal.

This week's .NET roundup centers on making agent and MCP workloads reliable in the real world, from durable long-running tasks on Azure App Service to the stateless-first direction in MCP C# SDK 2.0. On the security and supply chain front, NuGet.org is capping API key lifetimes (pushing teams toward OIDC-based Trusted Publishing), while ASP.NET Core in .NET 11 preview expands automatic CSRF defenses using Fetch Metadata headers. We also cover practical developer experience updates, including richer CI test reporting in Microsoft.Testing.Platform, Blazor performance and lifecycle tweaks in .NET 11 Preview 7, and a concrete local AI sample for live speech-to-text with Foundry Local.

Authorised Territory demonstrates how to use the .NET GitHub Copilot SDK with Ollama running locally, focusing on a practical developer workflow for wiring Copilot-style capabilities to a local model runtime.

Microsoft Developer shares a 2-minute weekly roundup covering an AI agent preview in Visual Studio built on the GitHub Copilot SDK, plus Azure AI Foundry model updates and the MCP C# SDK 2.0 release with stateless-first communication and improved interoperability.

jordanselig explains how to implement truly durable long-running Model Context Protocol (MCP) Tasks on Azure App Service, using a .NET sample that separates “task state” from “work execution” so tasks survive restarts, scale-in events, and dropped client connections.

Amaury Levé explains how Microsoft.Testing.Platform (MTP) reporting helps teams move from a failing CI build to actionable evidence, with inline annotations in GitHub Actions and Azure DevOps, Azure DevOps-only history-based flaky/regression triage, crash-resilient TRX output, and multiple report formats for both humans and automation.

Mike Hulme explains why Microsoft was named a Leader in Gartner’s 2026 Magic Quadrant for AI-augmented code modernization tools, and outlines how GitHub Copilot modernization and Azure are positioned to assess, upgrade, and migrate legacy applications with agentic workflows while keeping developers in control.

Fokko at Work demos selected new features in Visual Studio Code 1.132 that affect day-to-day Copilot Chat and editor workflows, including tracking session activity from the chat input, starting side chats with /btw, terminal output reflow, and dictation onboarding/customization, with notes on enterprise policy and plan-based availability.

EldertGrootenboer explains why some .NET Framework WCF Relay listeners start failing against Azure Relay after TLS 1.0/1.1 retirement, and outlines practical fixes ranging from app config changes to code updates and machine-wide registry settings.

Bruno Capuano, Pranav Senthilnathan, and Tarek Mahmoud Sayed walk through MCP C# SDK 2.0 and what its stateless-first approach means for building .NET AI agents, including standardized HTTP support, multi round-trip requests, and compatibility considerations, plus an overview of Microsoft Foundry Hosted Agents for scalable AI solutions.

Visual Studio Code shares a quick tip on using IntelliSense in the integrated terminal to speed up command-line work and reduce typos while you’re working inside VS Code.

The Visual Studio Code Team shares the 1.133 Insiders release notes, highlighting a change for extension authors: custom editor extensions can now set different default priorities for normal editing versus diff views, improving how custom editors behave when comparing files.

Authorised Territory demonstrates a .NET MCP server pattern where a tool call starts a background task and returns a task handle instead of an immediate result, while a .NET client polls the server every second until the final output is available.

Bruno Capuano shows how to build a Windows-only C# console app that performs live speech-to-text locally using Foundry Local and a compact Nemotron streaming ASR model, including model lifecycle management (download/cache/load/unload) and real-time interim/final transcription via async streams.

Giles Odigwe announces the stable release of the GitHub Copilot Agent for Microsoft Agent Framework in .NET and Python, showing how to use Copilot’s coding harness (shell, file, URL, and MCP tools) with Agent Framework features like middleware, streaming, OpenTelemetry tracing, and human-in-the-loop approvals.

Allison summarizes the CodeQL 2.26.2 release for GitHub code scanning, including new language support (Swift 6.3.3 and Kotlin 2.4.10), query behavior changes that may surface more findings, and a breaking change affecting how query authors embed links in alert messages.

Andrew Lock explains the new CSRF protection in ASP.NET Core (.NET 11 preview 6) that uses Fetch Metadata HTTP headers instead of synchronizer tokens, including how the middleware decides to allow or deny requests and what changes (if any) app authors need to make.

.NET Team announces upcoming NuGet.org publishing security changes: new API keys will be capped at 30 days starting August 17, 2026, and older keys will expire on November 1, 2026. The post explains the supply-chain risk of long-lived secrets and recommends migrating to NuGet Trusted Publishing using OIDC.

Daniel Roth and Javier Calvarro Nelson tour what’s new for ASP.NET Core and Blazor in .NET 11 Preview 7, including Blazor output caching, QuickGrid virtualization improvements, and changes to Blazor Server circuit behavior.

This week's .NET roundup centers on MCP becoming a practical foundation for agent tooling, with the MCP C# SDK v2.0 and new Agent Framework hooks that let agents discover skills at runtime with clearer safety boundaries. Visual Studio and VS Code also pushed further into agent-driven workflows, from a Copilot Chat Agent preview to an MCP-backed MSBuild binlog analyzer that can explain failures and performance bottlenecks. On the engineering side, the focus shifted to reliable automation (a unit-test agent that validates tests end-to-end and traced multi-agent orchestration with OpenTelemetry) plus a solid web security refresher on Fetch Metadata headers for defense-in-depth CSRF protection.

Amaury Levé introduces an open-source polyglot unit-test generation agent that learns a repo’s conventions, writes tests, and validates they build and run in the project’s normal test workflow. The post explains the agent’s research/plan/execute/check loop, shows benchmark results versus stock Copilot, and includes setup commands for Copilot CLI and VS Code.

Authorised Territory demonstrates how a .NET MCP server can expose a skill as a resource, and how an AI agent client can use that skill to answer a question, using a locally running LLM via Ollama.

Shawn Henry and Tamir Dresher show how to run a multi-agent “Squad” team on top of the GitHub Copilot CLI/SDK and expose it as a first-class Microsoft Agent Framework (MAF) AIAgent in a .NET app, including DI wiring, session configuration, and OpenTelemetry-based observability.

Visual Studio Code shares a quick tip for reducing token usage and improving GitHub Copilot results by running a grammar check on your prompt before submitting it in VS Code.

Allison summarizes the July 2026 updates for GitHub Copilot in Visual Studio, including a new preview agent built on the Copilot SDK, built-in .NET and Azure skills, selected-code review actions, and organization-wide custom instructions for consistent Copilot behavior across teams.

Visual Studio Code highlights three popular dark themes for VS Code—One Dark Pro, Midnight City, and Tokyo Night—prompting developers to compare the look and pick a favorite for their editor setup.

Rachel Kang introduces a new “thinking effort” control in Visual Studio 18.9 Insiders 2 that lets developers tune how much reasoning supported AI models use per request. The post explains the available levels, where to configure them in the model management UI, and how higher reasoning settings affect usage credits and response depth.

Andrew Lock explains the browser Fetch Metadata request headers (Sec-Fetch-Site, Sec-Fetch-Mode, Sec-Fetch-Dest, and Sec-Fetch-User), what their values mean, and how servers can use them to spot suspicious cross-origin requests and add another layer of CSRF defense alongside tokens and SameSite cookies.