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jellyfin/MediaBrowser.Common/Json/Converters/JsonNonStringKeyDictionaryC...

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2.1 KiB

#nullable enable
using System;
using System.Collections;
using System.Globalization;
using System.Reflection;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace MediaBrowser.Common.Json.Converters
{
/// <summary>
/// https://github.com/dotnet/runtime/issues/30524#issuecomment-524619972.
/// TODO This can be removed when System.Text.Json supports Dictionaries with non-string keys.
/// </summary>
internal sealed class JsonNonStringKeyDictionaryConverterFactory : JsonConverterFactory
{
/// <summary>
/// Only convert objects that implement IDictionary and do not have string keys.
/// </summary>
/// <param name="typeToConvert">Type convert.</param>
/// <returns>Conversion ability.</returns>
public override bool CanConvert(Type typeToConvert)
{
if (!typeToConvert.IsGenericType)
{
return false;
}
// Let built in converter handle string keys
if (typeToConvert.GenericTypeArguments[0] == typeof(string))
{
return false;
}
// Only support objects that implement IDictionary
return typeToConvert.GetInterface(nameof(IDictionary)) != null;
}
/// <summary>
/// Create converter for generic dictionary type.
/// </summary>
/// <param name="typeToConvert">Type to convert.</param>
/// <param name="options">Json serializer options.</param>
/// <returns>JsonConverter for given type.</returns>
public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
{
var converterType = typeof(JsonNonStringKeyDictionaryConverter<,>)
.MakeGenericType(typeToConvert.GenericTypeArguments[0], typeToConvert.GenericTypeArguments[1]);
var converter = (JsonConverter)Activator.CreateInstance(
converterType,
BindingFlags.Instance | BindingFlags.Public,
null,
null,
CultureInfo.CurrentCulture);
return converter;
}
}
}