MessageBox in .Net Core 3.1

Question

Microsoft documentation for .Net Core 3.1 says there is a MessageBox Class. If so, what is the NuGet package I need to download?

https://docs.microsoft.com/en-us/dotnet/api/system.windows.messagebox?view=netcore-3.1

It's included in the dotnet core starting 3.1. Just make sure your project targets that version, and then in your project reference setting make sure you uses System.Windows — texasbruce
Thanks, that did it. I spent an hour researching this topic, tried various things from System.Windows.MessageBox.Show() to just plain MessageBox.Show() and nothing worked. You replied and now it works as expected....I am chasing ghosts! — user610342
I see I was not actually chasing ghosts. MessageBox.Show() does indeed appear in a .Net Core 3.1 Windows Application and works there BUT I was also trying to use it in a .Net Core 3.1 Class Library which is where it does not appear. Hence, question persists: can I use MessageBox in a class library? — user610342

LJH LJH · Accepted Answer · 2020-06-24T11:53:18

Not sure you would want a Windows message box 'showing' in your class library; surely your other UI projects which rely on your class library, would be the place where any dialog boxes need to be shown in the UI?

MessageBox in .Net Core 3.1

2 Answers