OrdinalIgnoreCaseComparer.cs

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using System.Globalization;
using System.Runtime.Serialization;
 
namespace System;
 
[Serializable]
internal sealed class OrdinalIgnoreCaseComparer : OrdinalComparer, ISerializable
{
    internal static readonly OrdinalIgnoreCaseComparer Instance = new OrdinalIgnoreCaseComparer();
 
    private OrdinalIgnoreCaseComparer()
        : base(ignoreCase: true)
    {
    }
 
    public override int Compare(string x, string y)
    {
        return string.Compare(x, y, StringComparison.OrdinalIgnoreCase);
    }
 
    public override bool Equals(string x, string y)
    {
        if ((object)x == y)
        {
            return true;
        }
        if (x == null || y == null)
        {
            return false;
        }
        if (x.Length != y.Length)
        {
            return false;
        }
        return System.Globalization.Ordinal.EqualsIgnoreCase(ref x.GetRawStringData(), ref y.GetRawStringData(), x.Length);
    }
 
    public override int GetHashCode(string obj)
    {
        if (obj == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.obj);
        }
        return obj.GetHashCodeOrdinalIgnoreCase();
    }
 
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        info.SetType(typeof(OrdinalComparer));
        info.AddValue("_ignoreCase", value: true);
    }
}