Remove *Permission and *Assert.'s from code

[zsd4yr]

[danmoseley]

I would literally grep for *Assert and *Permission and remove those, then experimentally remove all using statements for System.Security, System.SEcurity.Permissions, and System.Security.Policy and see what if any compile errors you get. Those may be more hits.

[clairernovotny]

A "remove unused" would clean those unused usings up too in one gesture.

[kevingosse]

Before I go too far on this (there's a lot of them), are we absolutely we want to remove all the SecurityPermission/UIPermission/Assert stuff? I understand they're no-op on .net core, but coreclr/corefx keep a few of them for the parts of code that are shared with .net framework. Are we positive we don't need to do the same thing for winforms?

[sharwell]

💭 I'm not sure why we would be removing Debug.Assert calls. I sometimes use those to document assumptions made at different points in code and I wouldn't be surprised to see similar things in some places here.

[kevingosse]

The CAS asserts, not the debug asserts :)

For instance, https://github.com/dotnet/winforms/blob/master/src/System.Windows.Forms/src/System/Windows/Forms/WinFormsSecurity.cs#L488

[karelz]

Thanks for picking up the issue @kevingosse! I added you to collaborators list. Once you accept, ping me here and I will be able to assign it to you. (assigning to myself temporarily)

@dotnet/dotnet-winforms FYI about collaborator trick (with Read permissions) - see https://github.com/dotnet/winforms/settings/collaboration