xamarinmac 
namespace System.Globalization
{
    [ComVisible(true)]
    public abstract class EastAsianLunisolarCalendar : Calendar
    {
        public override bool IsLeapMonth(int year, int month, int era);
    }
}
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 1.01.12.02.12.23.03.1
.NET Framework 2.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 1.31.41.51.62.02.1
Information specific to xamarinmac
Assembly

mscorlib , Version=2.0.5.0, PublicKeyToken=7cec85d7bea7798e

Referencing

The API is automatically referenced.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API