net11.0 
namespace Microsoft.EntityFrameworkCore
{
    [JsonConverter(typeof(HierarchyIdJsonConverter))]
    public class HierarchyId : IComparable<HierarchyId!>
    {
        public virtual HierarchyId? GetAncestor(int n);
    }
}
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Reference this API
.NET
10.011.0
Information specific to net11.0
Assembly

Microsoft.EntityFrameworkCore.SqlServer.Abstractions , Version=11.0.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.EntityFrameworkCore.SqlServer.Abstractions.

Package Microsoft.EntityFrameworkCore.SqlServer.Abstractions (11.0.0-preview.4.26230.115) net10.0
Preview This API is contained in a prerelease package.
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API