EncoderFallbackException.cs

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using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
 
namespace System.Text;
 
[Serializable]
[TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public sealed class EncoderFallbackException : ArgumentException
{
    private readonly char _charUnknown;
 
    private readonly char _charUnknownHigh;
 
    private readonly char _charUnknownLow;
 
    private readonly int _index;
 
    public char CharUnknown => _charUnknown;
 
    public char CharUnknownHigh => _charUnknownHigh;
 
    public char CharUnknownLow => _charUnknownLow;
 
    public int Index => _index;
 
    public EncoderFallbackException()
        : base(SR.Arg_ArgumentException)
    {
        base.HResult = -2147024809;
    }
 
    public EncoderFallbackException(string? message)
        : base(message)
    {
        base.HResult = -2147024809;
    }
 
    public EncoderFallbackException(string? message, Exception? innerException)
        : base(message, innerException)
    {
        base.HResult = -2147024809;
    }
 
    internal EncoderFallbackException(string message, char charUnknown, int index)
        : base(message)
    {
        _charUnknown = charUnknown;
        _index = index;
    }
 
    internal EncoderFallbackException(string message, char charUnknownHigh, char charUnknownLow, int index)
        : base(message)
    {
        if (!char.IsHighSurrogate(charUnknownHigh))
        {
            throw new ArgumentOutOfRangeException("charUnknownHigh", SR.Format(SR.ArgumentOutOfRange_Range, 55296, 56319));
        }
        if (!char.IsLowSurrogate(charUnknownLow))
        {
            throw new ArgumentOutOfRangeException("CharUnknownLow", SR.Format(SR.ArgumentOutOfRange_Range, 56320, 57343));
        }
        _charUnknownHigh = charUnknownHigh;
        _charUnknownLow = charUnknownLow;
        _index = index;
    }
 
    private EncoderFallbackException(SerializationInfo serializationInfo, StreamingContext streamingContext)
        : base(serializationInfo, streamingContext)
    {
    }
 
    public bool IsUnknownSurrogate()
    {
        return _charUnknownHigh != '\0';
    }
}