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The error always appears in the generated file MainWindow.g.cs. This indicates that the XAML compiler is not correctly connecting the UI file to the code-behind file.
Troubleshooting Steps Already Taken:
I have already performed extensive troubleshooting, including:
Rebuilding the solution multiple times.
Cleaning the solution and manually deleting the bin, obj, and .vs folders.
Running dotnet restore from the Developer PowerShell.
Running the "Repair" feature from the Visual Studio Installer.
Performing a full factory reset of Windows and a fresh install.
After the factory reset, performing a fresh install of Visual Studio 2022 Community and also Visual Studio 2022 Preview.
During the installation, I selected the following workloads:
.NET desktop development
Universal Windows Platform development
Desktop development with C++
WinUI application development
The error persists even after a complete OS and Visual Studio reinstall, on both the stable and preview versions of Visual Studio. This seems to be a fundamental issue with the build tools or the SDK installation on my machine.
Any help would be greatly appreciated. Thank you.
The process of installing, configuring, and customizing Visual Studio to support development workflows across languages, platforms, and workloads.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 49%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESA%3C/text%3E%3C/svg%3E)
Steps to Solve
Download from .NET SDK Downloads WinUI 3 (via Windows App SDK) requires correct SDK version.
Install latest stable version (e.g., 1.4 or 1.5)
.NET Desktop Development
Universal Windows Platform development
Desktop development with C++
WinUI application development
"Enable XAML Designer" is ✅ enabled.
"Always recompile XAML" is ✅ checked.
Run: dotnet clean, dotnet build
Ensure XAML root tag contains x:Class="YourProject.MainWindow"
Hope you're doing well , we're following up on the ticket. Please let us know issue persist are resolved.
Hope you're doing well , we're following up on the ticket. Please let us know issue persist are resolved.
Hope you're doing well , we're following up on the ticket. Please let us know issue persist are resolved.
We haven’t received any further updates or follow-up on this case, so we’ll proceed with closing it at this time. If you require additional assistance or have new information to share, please feel free to raise new thread, we’re happy to support you further needed.