Background and motivation

PrinterSettings.StringCollection implements ICollection, but not ICollection<string>. It really isn't meant to be mutated, but implementing IReadOnlyList<string> is trivial (it already has everything except for IEnumerable<string>GetEnumerator().

API Proposal

namespace System.Drawing.Printing;

-public class StringCollection : ICollection
+public class StringCollection : ICollection, IReadOnlyList<string>
{
+    IEnumerator<string> IEnumerable<string>.GetEnumerator();
}

API Usage

PrinterSettings.InstalledPrinters. // Any IEnumerable<string> extension