DotNet Modernizer AI

DotNet Modernizer AI is a safety-first .NET modernization and migration assistant for Visual Studio. It helps developers analyze legacy .NET and C# solutions, assess migration readiness, identify risks, preview proposed changes, apply safe modernization actions, validate the result, and roll back changes when necessary.

Modernizing a .NET solution can involve hundreds of files, project references, NuGet dependencies, target-framework changes, and compatibility concerns. DotNet Modernizer AI brings these activities into a structured workflow directly inside Visual Studio.

Key Features .NET Migration Analysis — Analyze solutions and projects for modernization readiness and migration risks. Migration Risk Assessment — Classify findings and migration plans into safe, review, and blocking scenarios. Target Framework Migration — Support modern .NET target frameworks with project-type-aware handling for WPF, Windows Forms, ASP.NET Core, libraries, and test projects. Safe Automated Modernization — Apply only changes identified as safe under the configured migration policy. Migration Preview — Review proposed file and project changes before modifying your solution. True Dry Run — See what modernization changes would be proposed without modifying project files or source code. NuGet Intelligence — Detect legacy packages.config, missing/floating versions, prerelease packages, assembly references, and other dependency concerns. AI Migration Advisor — Provides migration guidance and explanations, with an offline advisor available by default and optional OpenAI-compatible remote AI configuration. Roslyn-Based Code Modernization — Analyze C# syntax and apply supported modernization transformations. Build & Test Validation — Validate target frameworks, .NET SDK compatibility, build results, compiler/MSBuild diagnostics, and test execution. Transaction & Rollback — Create migration backups and transaction journals so committed migrations can be rolled back when required. Audit & Diagnostics — Maintain operation history, diagnostic information, migration reports, and audit exports. Enterprise Policies — Configure confirmation requirements, automatic safe-change permissions, blocking policies, and release-validation requirements. Visual Studio Dashboard — Monitor solution health, readiness, findings, migration actions, build/test status, and recent operations from a dedicated tool window. Safety-First Workflow

DotNet Modernizer AI follows a controlled modernization workflow:

Analyze → Assess Risk → Select Profile → Dry Run → Preview → Approve → Backup → Apply → Build → Test → Validate → Audit → Rollback

The extension is designed to make modernization observable and controlled, rather than blindly modifying an entire solution.

Built for Modern .NET Projects

The extension supports migration scenarios involving modern .NET target frameworks, including project-type-aware handling such as:

.NET 10 .NET 9 .NET 8 WPF Windows Forms ASP.NET Core Class libraries Test projects Legacy .NET Framework modernization scenarios Who Is It For?

DotNet Modernizer AI is designed for:

C# developers .NET developers Development teams maintaining legacy applications Teams migrating older .NET applications to modern .NET WPF and Windows Forms developers Enterprise development teams Architects and technical leads Developers performing framework and dependency modernization Teams that need migration auditability and rollback protection Why DotNet Modernizer AI?

Instead of treating modernization as a simple target-framework replacement, DotNet Modernizer AI provides a structured process for analysis, risk assessment, controlled migration, validation, and recovery.

It is intended to help developers modernize .NET applications with greater visibility into what will change, why it will change, and whether the resulting solution builds and tests successfully.

Modernize with confidence. Analyze first. Change safely. Validate automatically. Roll back when necessary.