XNodeEqualityComparer.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System.Xml.Linq;
 
public sealed class XNodeEqualityComparer : IEqualityComparer, IEqualityComparer<XNode>
{
    public bool Equals(XNode? x, XNode? y)
    {
        return XNode.DeepEquals(x, y);
    }
 
    public int GetHashCode(XNode obj)
    {
        return obj?.GetDeepHashCode() ?? 0;
    }
 
    bool IEqualityComparer.Equals(object x, object y)
    {
        XNode xNode = x as XNode;
        if (xNode == null && x != null)
        {
            throw new ArgumentException(System.SR.Format(System.SR.Argument_MustBeDerivedFrom, typeof(XNode)), "x");
        }
        XNode xNode2 = y as XNode;
        if (xNode2 == null && y != null)
        {
            throw new ArgumentException(System.SR.Format(System.SR.Argument_MustBeDerivedFrom, typeof(XNode)), "y");
        }
        return Equals(xNode, xNode2);
    }
 
    int IEqualityComparer.GetHashCode(object obj)
    {
        XNode xNode = obj as XNode;
        if (xNode == null && obj != null)
        {
            throw new ArgumentException(System.SR.Format(System.SR.Argument_MustBeDerivedFrom, typeof(XNode)), "obj");
        }
        return GetHashCode(xNode);
    }
}