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UTType.GetDescription(string uti) in Mobilecoreservices
throws ArgumentNullException when the argument is not null, and does not throw the exception when the argument is null.
Looking at the Xamarin source code /src/MobileCoreServices/UTType.cs
public string GetDescription (string uti)
if (uti != null)
throw new ArgumentNullException ("uti");
var a = NSString.CreateNative (uti);
var ret = NSString.FromHandle (UTTypeCopyDescription (a));
It should be
if (uti == null)
Woops. You are correct.
Fixed in master and cycle9.
Thanks for the report. This will be fixed in the next major release.