ByteArrayHelperWithString.cs

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using System.Globalization;
using System.Xml;
 
namespace System.Runtime.Serialization.Json;
 
internal sealed class ByteArrayHelperWithString : ArrayHelper<string, byte>
{
    public static readonly ByteArrayHelperWithString Instance = new ByteArrayHelperWithString();
 
    internal void WriteArray(XmlWriter writer, byte[] array, int offset, int count)
    {
        XmlJsonReader.CheckArray(array, offset, count);
        writer.WriteAttributeString(string.Empty, "type", string.Empty, "array");
        for (int i = 0; i < count; i++)
        {
            writer.WriteStartElement("item", string.Empty);
            writer.WriteAttributeString(string.Empty, "type", string.Empty, "number");
            writer.WriteValue(array[offset + i]);
            writer.WriteEndElement();
        }
    }
 
    protected override int ReadArray(XmlDictionaryReader reader, string localName, string namespaceUri, byte[] array, int offset, int count)
    {
        XmlJsonReader.CheckArray(array, offset, count);
        int i;
        for (i = 0; i < count; i++)
        {
            if (!reader.IsStartElement("item", string.Empty))
            {
                break;
            }
            array[offset + i] = ToByte(reader.ReadElementContentAsInt());
        }
        return i;
    }
 
    protected override void WriteArray(XmlDictionaryWriter writer, string prefix, string localName, string namespaceUri, byte[] array, int offset, int count)
    {
        WriteArray(writer, array, offset, count);
    }
 
    private void ThrowConversionException(string value, string type)
    {
        throw new XmlException(System.SR.Format(System.SR.XmlInvalidConversion, value, type));
    }
 
    private byte ToByte(int value)
    {
        if (value < 0 || value > 255)
        {
            ThrowConversionException(value.ToString(NumberFormatInfo.CurrentInfo), "Byte");
        }
        return (byte)value;
    }
}