using System; using System.Text.Json; using System.Text.Json.Serialization; namespace MediaBrowser.Common.Json.Converters { /// <summary> /// Converts a nullable struct or value to/from JSON. /// Required - some clients send an empty string. /// </summary> /// <typeparam name="TStruct">The struct type.</typeparam> public class JsonNullableStructConverter<TStruct> : JsonConverter<TStruct?> where TStruct : struct { /// <inheritdoc /> public override TStruct? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) { if (reader.TokenType == JsonTokenType.Null) { return null; } // Token is empty string. if (reader.TokenType == JsonTokenType.String && ((reader.HasValueSequence && reader.ValueSequence.IsEmpty) || reader.ValueSpan.IsEmpty)) { return null; } return JsonSerializer.Deserialize<TStruct>(ref reader, options); } /// <inheritdoc /> public override void Write(Utf8JsonWriter writer, TStruct? value, JsonSerializerOptions options) { if (value.HasValue) { JsonSerializer.Serialize(writer, value.Value, options); } else { writer.WriteNullValue(); } } } }