You need to install Windows Workflow Foundation (WF) support in Visual Studio — it’s not included by default in newer versions of Visual Studio (like 2022).Without it, workflow projects (.xaml or .xamlx) will fail to build, showing XamlBuildTask errors.
Steps to install Windows Workflow Foundation in Visual Studio 2022
Open Visual Studio Installer-> Modify your Visual Studio installation
Modify.
Go to “Individual components” tab
(It should look like this:)
enter image description here
(screenshot reference from Visual Studio Installer)
Click “Modify” (bottom right)
That should resolve the XamlBuildTask error for Windows Workflow projects.
