CaseInsensitiveKeyComparer.cs

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using System.Collections;
using System.Globalization;
 
namespace System.Xml.Serialization;
 
internal sealed class CaseInsensitiveKeyComparer : CaseInsensitiveComparer, IEqualityComparer
{
    public CaseInsensitiveKeyComparer()
        : base(CultureInfo.CurrentCulture)
    {
    }
 
    bool IEqualityComparer.Equals(object x, object y)
    {
        return Compare(x, y) == 0;
    }
 
    int IEqualityComparer.GetHashCode(object obj)
    {
        if (!(obj is string str))
        {
            throw new ArgumentException(null, "obj");
        }
        return CultureInfo.CurrentCulture.TextInfo.ToUpper(str).GetHashCode();
    }
}