CharConverter.cs

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using System.Runtime.InteropServices;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class CharConverter : JsonConverter<char>
{
    public override char Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        string @string = reader.GetString();
        if (string.IsNullOrEmpty(@string) || @string.Length > 1)
        {
            throw ThrowHelper.GetInvalidOperationException_ExpectedChar(reader.TokenType);
        }
        return @string[0];
    }
 
    public override void Write(Utf8JsonWriter writer, char value, JsonSerializerOptions options)
    {
        writer.WriteStringValue(MemoryMarshal.CreateSpan(ref value, 1));
    }
 
    internal override char ReadAsPropertyNameCore(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return Read(ref reader, typeToConvert, options);
    }
 
    internal override void WriteAsPropertyNameCore(Utf8JsonWriter writer, char value, JsonSerializerOptions options, bool isWritingExtensionDataProperty)
    {
        writer.WritePropertyName(MemoryMarshal.CreateSpan(ref value, 1));
    }
}