.NET MAUI App Stopped Working -- HELP!
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A troubleshooting guide for common .NET MAUI development issues that cause apps to suddenly break. Covers fixes for: SDK version mismatches (solved with global.json), build failures caused by .DS_Store files in image folders, binding SelectionChanged items to CommandParameter in CollectionView, CommunityToolkit.Mvvm source generator issues with missing properties/commands, dependency injection registration errors in MauiProgram, and slow builds from multiple TargetFrameworks.
Table of contents
Everything Is Screaming Red and Broken!Build Fails with One or More Invalid Files Were DetectedPass SelectItem to My View Model CommandCommunityToolkit.Mvvm Can’t Find My Properties or CommandsMy MAUI App Never Starts! What Gives?!My MAUI Build is Slow!Conclusion3 Impressions