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143 indexed repositories · View on GitHub

aspnetcore
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.

C# · 38450 stars
maui
.NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.

C# · 23316 stars
core
.NET news, announcements, release notes, and more!

PowerShell · 22034 stars
AspNetCore.Docs
Documentation for ASP.NET Core

C# · 13136 stars
csharplang
The official repo for the design of the C# programming language

C# · 12706 stars
BenchmarkDotNet
Powerful .NET library for benchmarking

C# · 11494 stars
eShop
A reference .NET application implementing an eCommerce site

C# · 10876 stars
orleans
Cloud Native application framework for .NET

C# · 10866 stars
yarp
A toolkit for developing high-performance HTTP reverse proxy applications.

C# · 9613 stars
machinelearning
ML.NET is an open source and cross-platform machine learning framework for .NET.

C# · 9356 stars
wpf
WPF is a .NET Core UI framework for building Windows desktop applications.

C# · 7730 stars
reactive
The Reactive Extensions for .NET

C# · 7190 stars
msbuild
The Microsoft Build Engine (MSBuild) is the build platform for .NET and Visual Studio.

C# · 5549 stars
skills
Repository for skills to assist AI coding agents with .NET and C#

C# · 5445 stars
Silk.NET
The high-speed OpenGL, OpenCL, OpenAL, OpenXR, GLFW, SDL, Vulkan, Assimp, WebGPU, and DirectX bindings library your mother warned you about.

C# · 5202 stars
MQTTnet
MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker). The implem...

C# · 5065 stars
dotnet-docker
Official container images for .NET

Dockerfile · 4874 stars
winforms
Windows Forms is a .NET UI framework for building Windows desktop applications.

C# · 4858 stars
docs
This repository contains .NET Documentation.

4767 stars
machinelearning-samples
Samples for ML.NET, an open source and cross-platform machine learning framework for .NET.

PowerShell · 4686 stars
123 more repositories live on View on GitHub

Beginner friendly Everything

Open All

Need a return after the NotFound call in Blazor CRUD Edit components Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

dotnet/Scaffolding#3828 · 1 reaction · Opened Sep 14, 2026
[SignalR] Negative SequenceMessage.SequenceId permanently silences a connection Open

area-signalr

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

dotnet/aspnetcore#69283 · 1 comment · Opened Sep 14, 2026
[ci-scan-feedback] Key crossgen2/ILC compile-phase KBEs on compiler+exception, not work-item name Open

agentic-workflows area-Infrastructure untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/runtime#133876 · 1 comment · Opened Sep 14, 2026
NullReferenceException in WebViewHandler.Windows.cs OnCoreWebView2Initialized when WebView2 initialization fails Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

dotnet/maui#38527 · 1 reaction · Opened Sep 14, 2026
[Blazor][Components.AI] Allow custom handlers to replace structured RichContentBlock content Open

api-proposal api-suggestion area-blazor

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

dotnet/aspnetcore#69266 · 1 comment · Opened Sep 14, 2026
MemoryMappedView leak Open

area-System.IO

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/runtime#133744 · 1 comment · Opened Sep 11, 2026
iOS: app killed with 0xdead10cc — StackTraceSymbols holds a shared flock on the PDB inside the app bundle Open

area-System.Diagnostics os-ios untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

dotnet/runtime#133697 · 4 comments · Opened Sep 11, 2026
Support multiple error message strings in known issue creation dialog Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/arcade-services#6698 · Opened Sep 10, 2026
gRPC AuthContext: SAN dNSName extraction relies on parsing X509Extension.Format() text instead of typed API Open

area-grpc

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

dotnet/aspnetcore#69169 · 1 comment · Opened Sep 9, 2026
[leak-scan] MauiHotReloadHelper.currentViews — disabled unregister leaves views rooted Open

agentic-workflows perf/memory-leak 💦

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

dotnet/maui#38351 · Opened Sep 9, 2026
Microsoft.Extensions.AI.OpenAI nuget package constrains OpenAI to <2.13.0 Open

bug untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/extensions#7740 · Opened Sep 8, 2026
TaskAnalyzer: null-conditional access defeats safe-path detection (fi.Directory?.FullName flagged, fi.Directory.FullName not) Open

Area: Analyzer

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

dotnet/msbuild#14979 · Opened Sep 8, 2026
Remove the AbsolutePath.GetCanonicalForm polyfill once Arcade consumes an MSBuild with the public API Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

dotnet/arcade#17506 · 2 comments · Opened Sep 8, 2026
[API Proposal]: Add Protobuf and ProtobufJson to MediaTypeNames.Application Open

api-suggestion area-System.Net

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

dotnet/runtime#133365 · 5 comments · Opened Sep 7, 2026
[browser] Remove traces of AOT on helix Open

arch-wasm area-Infrastructure-mono os-browser

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/runtime#133363 · 2 comments · Opened Sep 7, 2026
[aw] Expert Code Review (on open) has stale lock file Open

agentic-workflows

Difficulty 1/5 Under an hour Newbie friendliness 85/100

dotnet/msbuild#14960 · 4 comments · Opened Sep 7, 2026
Memory leak at debugger-agent.c (dotnet version - 11.0.100-rc.1.26420.103) Open

area-Debugger-mono

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

dotnet/runtime#133354 · 4 comments · Opened Sep 7, 2026
Quarantine BlazorTemplates.Tests.BlazorWebTemplateTest.BlazorWebTemplate_CanUsePasskeys and BlazorWebTemplate_CanRequireConfirme [Content t Open

test-failure

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/aspnetcore#69095 · 1 comment · Opened Sep 7, 2026
Crash when quiting app with AppKit backend Open

Difficulty 2/5 1-3 hours Newbie friendliness 80/100

dotnet/maui-labs#473 · Opened Sep 7, 2026
Schema transformers receive an ignored property's metadata for a polymorphic discriminator node Open

area-minimal feature-openapi

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/aspnetcore#69080 · 1 comment · Opened Sep 6, 2026
[Proposal] Add Microsoft Learn MCP Server Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/skills#1124 · Opened Sep 4, 2026
[leak-scan] GradientBrush.GradientStops — Clear leaves child handlers attached Open

agentic-workflows perf/memory-leak 💦

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

dotnet/maui#38179 · Opened Sep 4, 2026
Semantic classification cache for opened documents is never populated (written to the unopened-documents cache) Open

Needs-Triage

Difficulty 1/5 Under an hour Newbie friendliness 90/100

dotnet/fsharp#20445 · Opened Sep 3, 2026
[ci-scan] Build break: SOS.Tests receives unsupported --method option Open

area-Infrastructure blocking-clean-ci Known Build Error untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/runtime#133175 · 2 comments · Opened Sep 3, 2026
[iOS] NavigationRenderer.SetStatusBarStyle null check does not protect the following NavPage dereferences Open

area-controls-navigationpage platform/ios

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

dotnet/maui#38153 · 1 reaction · Opened Sep 3, 2026
[aw] Memory Leak Fixer is missing required tool Open

agentic-workflows

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

dotnet/maui#38132 · Opened Sep 3, 2026
Memory leak in DefaultPartitionedRateLimiter - backport to NET10 Open

area-System.Threading untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/runtime#133110 · 2 comments · Opened Sep 2, 2026
[ci-scan-feedback] Reject shared-console-log suite-harness KBE signatures Open

agentic-workflows area-Infrastructure untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

dotnet/runtime#133080 · 1 comment · Opened Sep 2, 2026
[maui-labs docs] Update plugin installation instructions for DevFlow skills split (maui-labs PR #375) Open

:watch: Not Triaged

Difficulty 2/5 1-2 days Newbie friendliness 68/100

dotnet/docs-maui#3499 · Opened Sep 2, 2026
[maui-labs docs] maui doctor: Document new Xcode compatibility check with auto-fix Open

:watch: Not Triaged

Difficulty 2/5 Half a day Newbie friendliness 78/100

dotnet/docs-maui#3498 · Opened Sep 2, 2026
Cell selection hot key Open

Feature request Up for grabs

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/ResXResourceManager#777 · Opened Sep 1, 2026
[ci-scan-feedback] Prevent shared-Helix-log catch-all KBE signatures Open

agentic-workflows area-Infrastructure untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/runtime#133010 · 1 comment · Opened Sep 1, 2026
Align Device Bound Sessions package with platform prerelease versioning Open

area-infrastructure

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

dotnet/aspnetcore#68936 · 2 comments · Opened Sep 1, 2026
Perf harness: SetProcessAffinityMask called without ctypes argtypes, so Windows CPU pinning does not take effect Open

:new: Triage Needed Area\Engineering Performance :chart_with_upwards_trend:

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/SqlClient#4617 · 1 comment · Opened Aug 31, 2026
Add missing ExpandoObject test coverage in ObjectVisitorTest Open

area-networking feature-json-patch

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

dotnet/aspnetcore#68933 · 1 comment · Opened Aug 31, 2026
[ci-scan-feedback] Fix fixer dedup: resolve head.ref via list tools, not search Open

agentic-workflows area-Infrastructure untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/runtime#132967 · 1 comment · Opened Aug 31, 2026
[ci-scan-feedback] harden fixer self-dedup with a non-integrity-gated branch-list backstop Open

agentic-workflows area-Infrastructure untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/runtime#132949 · 1 comment · Opened Aug 30, 2026
Signature generation drops parentheses around nested tuple argument when a sibling argument is named Open

Area-Compiler-SigFileGen Bug

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

dotnet/fsharp#20397 · 1 reaction · Opened Aug 30, 2026
osバージョン26H1の.NET3.5を有効化 Open

:watch: Not Triaged dotnet-framework/svc install-deployment/subsvc

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/docs#55766 · Opened Aug 27, 2026
Missing Open

area-tutorials needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 63/100

dotnet/website-feedback#1681 · Opened Aug 27, 2026
[aw] Memory Leak Fixer is missing required data Open

agentic-workflows

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/maui#37905 · 1 comment · Opened Aug 27, 2026
UriComponents.Path documentation implies LocalPath is always returned, but this is only true for file:// URIs Open

untriaged

Difficulty 1/5 Under an hour Newbie friendliness 88/100

dotnet/dotnet-api-docs#13039 · 1 comment · Opened Aug 27, 2026
[Windows] BlazorWebView should enable WebView2.AllowDrop for external file drops Open

area-blazor platform/windows s/triaged s/verified t/bug

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/maui#37903 · 1 comment · 1 reaction · Opened Aug 27, 2026
[iOS] MediaPicker.PickPhotosAsync throws UIKitThreadAccessException when 2 or more items are selected (regression in 10.0.100) Open

area-essentials i/regression platform/ios regressed-in-10.0.100 s/triaged s/verified

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

dotnet/maui#37878 · 1 comment · 3 reactions · Opened Aug 27, 2026
Designer shadow-copy leak when multi-targeting .NET Framework and modern frameworks Open

untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

dotnet/sdk#55954 · 1 comment · Opened Aug 26, 2026
[aw] Triage has no AI credits pricing for model (auto) Open

agentic-workflows

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dotnet/source-build#5656 · 2 comments · Opened Aug 26, 2026
Test failure: GetHostEntryTest.Dns_GetHostEntryAsync_IPAddress_Ok times out on macOS (runtime-extra-platforms) Open

area-System.Net Known Build Error os-mac-os-x

Difficulty 1/5 1-3 hours Newbie friendliness 86/100

dotnet/runtime#132750 · 1 comment · Opened Aug 25, 2026
[tests] Re-enable LLVM AOT for the 'dont link' tests once the mono uaddlp/saddlp intrinsic fix flows in Open

copilot

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/macios#26467 · Opened Aug 25, 2026
maui-expert-reviewer: src/Core/maps/** matches no row in the dimension routing table Open

area-ai-agents platform/android platform/ios platform/macos

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

dotnet/maui#37776 · 1 reaction · Opened Aug 24, 2026
[Android] Map: default cluster bubble bypasses the cluster icon cache Open

area-controls-map platform/android s/needs-attention

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

dotnet/maui#37775 · 1 comment · 1 reaction · Opened Aug 24, 2026

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