CaseInsensitiveHashCodeProvider.cs

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using System.Globalization;
 
namespace System.Collections;
 
[Obsolete("CaseInsensitiveHashCodeProvider has been deprecated. Use StringComparer instead.")]
public class CaseInsensitiveHashCodeProvider : IHashCodeProvider
{
    private static volatile CaseInsensitiveHashCodeProvider s_invariantCaseInsensitiveHashCodeProvider;
 
    private readonly CompareInfo _compareInfo;
 
    public static CaseInsensitiveHashCodeProvider Default => new CaseInsensitiveHashCodeProvider();
 
    public static CaseInsensitiveHashCodeProvider DefaultInvariant => s_invariantCaseInsensitiveHashCodeProvider ?? (s_invariantCaseInsensitiveHashCodeProvider = new CaseInsensitiveHashCodeProvider(CultureInfo.InvariantCulture));
 
    public CaseInsensitiveHashCodeProvider()
    {
        _compareInfo = CultureInfo.CurrentCulture.CompareInfo;
    }
 
    public CaseInsensitiveHashCodeProvider(CultureInfo culture)
    {
        if (culture == null)
        {
            throw new ArgumentNullException("culture");
        }
        _compareInfo = culture.CompareInfo;
    }
 
    public int GetHashCode(object obj)
    {
        if (obj == null)
        {
            throw new ArgumentNullException("obj");
        }
        if (!(obj is string source))
        {
            return obj.GetHashCode();
        }
        return _compareInfo.GetHashCode(source, CompareOptions.IgnoreCase);
    }
}