CryptoExchange.Net/CryptoExchange.Net/Converters/SystemTextJson/ObjectStringConverter.cs

using System;
using System.Text.Json.Serialization;
using System.Text.Json;
using System.Diagnostics.CodeAnalysis;

namespace CryptoExchange.Net.Converters.SystemTextJson
{
    /// <summary>
    /// Converter for values which contain a nested json value
    /// </summary>
    public class ObjectStringConverter<T> : JsonConverter<T>
    {
        /// <inheritdoc />
#if NET5_0_OR_GREATER
        [UnconditionalSuppressMessage("AssemblyLoadTrimming", "IL3050:RequiresUnreferencedCode", Justification = "JsonSerializerOptions provided here has TypeInfoResolver set")]
        [UnconditionalSuppressMessage("AssemblyLoadTrimming", "IL2026:RequiresUnreferencedCode", Justification = "JsonSerializerOptions provided here has TypeInfoResolver set")]
#endif
        public override T? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.Null)
                return default;

            var value = reader.GetString();
            if (string.IsNullOrEmpty(value))
                return default;

            return JsonDocument.Parse(value!).Deserialize<T>(options);
        }

        /// <inheritdoc />
#if NET5_0_OR_GREATER
        [UnconditionalSuppressMessage("AssemblyLoadTrimming", "IL3050:RequiresUnreferencedCode", Justification = "JsonSerializerOptions provided here has TypeInfoResolver set")]
        [UnconditionalSuppressMessage("AssemblyLoadTrimming", "IL2026:RequiresUnreferencedCode", Justification = "JsonSerializerOptions provided here has TypeInfoResolver set")]
#endif
        public override void Write(Utf8JsonWriter writer, T? value, JsonSerializerOptions options)
        {
            if (value is null)
                writer.WriteStringValue("");

            writer.WriteStringValue(JsonSerializer.Serialize(value, options));
        }
    }
}