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When trying to open a VS19 project with VS22, the Designer gives this error
The type 'System.Configuration.ApplicationScopedSettingAttribute' could not be found.
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This error typically occurs due to missing or incorrect framework references when migrating from Visual Studio 2019 to Visual Studio 2022.
Right-click on the project in Solution Explorer
Select Properties
Verify the Target Framework is appropriate (e.g., .NET Framework 4.8)
If the above doesn't help:
Build > Clean Solution
Delete the bin and obj folders
Rebuild the solution
The problem was solved by installing .NET 9.0.
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Hello @Poul Hansen,
Looks like the error only appears when using the designer. Please try to clear some cache files and see if it works.
Close VS 2022, delete the bin, obj and the hidden .vs folder(in your solution folder). Restart VS 2022 and reopen your project, rebuild the project, check again.
As the error message mentioned that it can’t find the type, if this error persists, try to install the corresponding NuGet package into your project(Right-click your project => Manage NuGet Packages => Browse => search "System.Configuration.ConfigurationManager" => click to install).
Best Regards,
Tianyu
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