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Found 230 Skills
Configure Aspire AppHost to emit explicit app config via environment variables; keep app code free of Aspire clients and service discovery.
Migrate a .NET 9 project or solution to .NET 10 and resolve all breaking changes. USE FOR: upgrading TargetFramework from net9.0 to net10.0, fixing build errors after updating the .NET 10 SDK, resolving source and behavioral changes in .NET 10 / C# 14 / ASP.NET Core 10 / EF Core 10, updating Dockerfiles for Debian-to-Ubuntu base images, resolving obsoletion warnings (SYSLIB0058-SYSLIB0062), adapting to SDK/NuGet changes (NU1510, PrunePackageReference), migrating System.Linq.Async to built-in AsyncEnumerable, fixing OpenApi v2 API changes, cryptography renames, and C# 14 compiler changes (field keyword, extension keyword, span overloads). DO NOT USE FOR: .NET Framework migrations, upgrading from .NET 8 or earlier (use migrate-dotnet8-to-dotnet9 first), greenfield .NET 10 projects, or cosmetic modernization. LOADS REFERENCES: csharp-compiler, core-libraries, sdk-msbuild (always); aspnet-core, efcore, cryptography, extensions-hosting, serialization-networking, winforms-wpf, containers-interop (selective).
Create, edit, and convert Markdown documents (.md) using Syncfusion Markdown. Supports two modes — generate C# code for the user's project or execute a task via CSX script. Use when the user mentions markdown, .md files, markdown generation, Syncfusion Markdown.
Create, edit, and convert Excel workbooks (.xlsx/.xls) using Syncfusion XlsIO. Supports two modes — generate C# code for the user's project, or execute a temporary CSX script. Use when the user mentions Excel, xlsx, workbook, template markers, Syncfusion XlsIO, or PDF conversion.
Entity Framework Core best practices including NoTracking by default, query splitting for navigation collections, migration management, dedicated migration services, and common pitfalls to avoid.
Implement Domain-Driven Design tactical patterns in C#/.NET. Use when building Entities, Value Objects, Aggregates, Domain Events, Repositories, or structuring a DDD solution. Framework-agnostic — covers pure domain modeling with modern C#.
Write integration tests using TestContainers for .NET with xUnit. Covers infrastructure testing with real databases, message queues, and caches in Docker containers instead of mocks.
C# error handling, validation, and Result pattern best practices. Use when handling exceptions, implementing validation, designing error responses, or choosing between exceptions and Result types.
Builds WPF on .NET 8+. Host builder, MVVM Toolkit, Fluent theme, performance, modern C# patterns.
Builds ASP.NET Core APIs, EF Core data access, gRPC, SignalR, and backend services with middleware, security (OAuth, JWT, OWASP), resilience, messaging, OpenAPI, .NET Aspire, Semantic Kernel, HybridCache, YARP reverse proxy, output caching, Office documents (Excel, Word, PowerPoint), PDF, and architecture patterns. Spans 32 topic areas. Do not use for UI rendering patterns or CI/CD pipeline authoring.
Run single-file C# programs as scripts for quick experimentation, prototyping, and concept testing. Use when the user wants to write and execute a small C# program without creating a full project.
Guide for optimizing MSBuild incremental builds. Only activate in MSBuild/.NET build context. Use when builds are slower than expected on subsequent runs, when 'nothing changed but it rebuilds anyway', or when diagnosing why incremental builds are broken. Covers Inputs/Outputs on targets, FileWrites tracking, up-to-date checks, and diagnosing unnecessary rebuilds via binlog analysis.