xamarinmac 
namespace AppKit
{
    public static class NSOutlineViewDataSource_Extensions
    {
        [BindingImpl(BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
        public static nint GetChildrenCount(this INSOutlineViewDataSource! This, NSOutlineView! outlineView, NSObject? item);
    }
}
nuget.org
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Reference this API
.NET 6.07.08.09.0
Information specific to xamarinmac
Assembly

Xamarin.Mac , Version=0.0.0.0, PublicKeyToken=84e04ff9cfb79065

Referencing

The API is automatically referenced.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API