How to add reference to WinForms if I am developing a WPF project?

Question

I am using a third-party nuget package in my WPF project, on .NET 5. When I am trying to call some code, I get such message:

Severity    Code    Description Project File    Line    Suppression State
Error   CS0012  The type 'UserControl' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Windows.Forms, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

A third-party WPF library references Winforms Class named UserControl.

When I click on yellow-red icon to automatically resolve issue a Reference Manager window opens... I checked StackOverflow and did not find a similar situation. So, what do I do next? How do I add reference to Winforms library to WPF project on .NET 5?

To be more specific, mRenderCtrl is of type AnyCAD.WPF.RenderControl, which is `RenderControl : UserControl, IComponentConnector`, in `namespace AnyCAD.WPF`. View3D is of class `RenderControl : System.Windows.Forms.UserControl` which is in `namespace AnyCAD.Forms` — Ivan P., Aug 28 '21 at 07:19

score 0 · Accepted Answer · answered Aug 28 '21 at 07:45

0

I found it:

Add reference of System.Windows.forms in .Net Core

So, I had to add this line to my project file:

    <UseWindowsForms>true</UseWindowsForms>

answered Aug 28 '21 at 07:45

Ivan P.

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It solved the problem, but I can mark answer only in 2 days – Ivan P. Aug 28 '21 at 07:46

How to add reference to WinForms if I am developing a WPF project?

1 Answers1