https://docs.microsoft.com/en-us/dotnet/api/system.drawing.design.uitypeeditor?view=net-5.0
The UITypeEditor class is not used for NET5. They say it's supported, but I don't agree with that.
I can't use it in a library that used NET5.
Examples:


It works fine for me in a .Net 5.0 library whose csproj looks like this:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net5.0</TargetFramework>
<UseWindowsForms>true</UseWindowsForms>
</PropertyGroup>
</Project>
Can you share your csproj?
Bu csproj bu gibi g枚r眉n眉yor bir .Net 5.0 k眉t眉phanede benim i莽in iyi 莽al谋艧谋yor:
<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <TargetFramework>net5.0</TargetFramework> <UseWindowsForms>true</UseWindowsForms> </PropertyGroup> </Project>Csproj'unuzu payla艧abilir misiniz?
https://github.com/Taiizor/ReaLTaiizor/blob/develop/src/ReaLTaiizor/ReaLTaiizor.csproj
<UseWindowsForms>true</UseWindowsForms> It was fixed when I added the code :)
Most helpful comment
It works fine for me in a .Net 5.0 library whose csproj looks like this:
Can you share your csproj?