using Newtonsoft.Json;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LiveForum.Code.JsonConverterExtend
{
    // 自定义字符串转换器
    public class NullToEmptyStringConverter : Newtonsoft.Json.JsonConverter
    {
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(string);
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null)
            {
                return string.Empty;
            }
            return reader.Value?.ToString() ?? string.Empty;
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            writer.WriteValue(value?.ToString() ?? string.Empty);
        }
    }
}