net10.0-windows7.0 
namespace Windows.UI.Xaml
{
    public sealed class Duration : ValueType
    {
        public static ? operator !=(Duration t1, Duration t2);
    }
}
nuget.org
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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 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 1.11.21.31.41.51.62.02.1
Information specific to net10.0
Platforms This API is only available when you target a specific platform:
Windows 7.0
Information specific to net10.0-windows7.0
Assemblies

System.Runtime.WindowsRuntime.UI.Xaml , Version=4.0.4.0, PublicKeyToken=b77a5c561934e089

System.Runtime.WindowsRuntime.UI.Xaml , Version=4.0.5.0, PublicKeyToken=b77a5c561934e089

Referencing

Your project needs a package reference to System.Runtime.WindowsRuntime.UI.Xaml.

Package System.Runtime.WindowsRuntime.UI.Xaml (5.0.0-preview.5.20278.1) netstandard2.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API