System.Windows.Forms exception on windows build (exe)

[hippogamesunity]

ArgumentException: The Assembly System.Drawing is referenced by System.Windows.Forms ('Assets/StandaloneFileBrowser/Plugins/System.Windows.Forms.dll'). But the dll is not allowed to be included or could not be found.

A workaround suggested here doesn't work for me in Unity 2019.2.4

So I've made my own workaround and can suggest you to add it to the repo:

• replace System.Windows.Forms (targeting .NET 3.5) to C:\Windows\Microsoft.NET\Framework\v4.0.30319 (targeting .NET 4)
• add System.Deployment.dll (as required by System.Windows.Forms)
• switch to Mono [!]
• build

[Hshan7]

It's works, thank very much. But after bulid the dialog can not show in program but only in the Unity editor. Have someone ever met the same problem?

[hippogamesunity]

@Hshan7 omg, you're right, I've forgot to test it outside of Unity. So the only solution I've found is targeting your project to .NET 3.5 and using original DLL. Hope @gkngkc will help us.

[hippogamesunity]

@Hshan7 System.Windows.Forms (.NET 4.0) works with Mono Scripting Backend!

[Hshan7]

@Hshan7 System.Windows.Forms (.NET 4.0) works with Mono Scripting Backend!
I switch my api compatibility level to .NET 4.x in player settings and the dialog can show. And no need to replace the System.Windows.Forms.dll or add System.Deployment.dll. Thanks for your answer.

[veggiesaurus]

Hoping there's some way to get this to work with IL2CPP as well.

[kaninhot004]

Change Player Setting .NET to 4.0 can be solved this problem like @Hshan7 said.