EncodingInfo.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Text;
 
public sealed class EncodingInfo
{
    public int CodePage { get; }
 
    public string Name { get; }
 
    public string DisplayName { get; }
 
    internal EncodingProvider? Provider { get; }
 
    public EncodingInfo(EncodingProvider provider, int codePage, string name, string displayName)
        : this(codePage, name, displayName)
    {
        if (name == null || displayName == null || provider == null)
        {
            throw new ArgumentNullException((name == null) ? "name" : ((displayName == null) ? "displayName" : "provider"));
        }
        Provider = provider;
    }
 
    internal EncodingInfo(int codePage, string name, string displayName)
    {
        CodePage = codePage;
        Name = name;
        DisplayName = displayName;
    }
 
    public Encoding GetEncoding()
    {
        return Provider?.GetEncoding(CodePage) ?? Encoding.GetEncoding(CodePage);
    }
 
    public override bool Equals([NotNullWhen(true)] object? value)
    {
        if (value is EncodingInfo encodingInfo)
        {
            return CodePage == encodingInfo.CodePage;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return CodePage;
    }
}