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How to make desktop program in Windows and MacOs by c#?

I made a small program using c# and winform. But I found out that some of the users had mac users. I am willing to recreate this program for mac users.

How can I create a desktop program for mac users in a Windows 10 visual studio c# environment?

1. Does it work on Windows and mac at the same time if it is made into a WPF.net core program?
2. If I make it Xamarin, does it work on Windows and mac at the same time?