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TypeConverterJsonConverterFactory.cs
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TypeConverterJsonConverterFactory.cs
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namespace StrongTypeIdGenerator.Json
{
using System;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text.Json;
using System.Text.Json.Serialization;
/// <summary>
/// Adapter between <see cref="System.ComponentModel.TypeConverter"/>
/// and <see cref="JsonConverter"/>
/// </summary>
public class TypeConverterJsonConverterFactory : JsonConverterFactory
{
public override bool CanConvert(Type typeToConvert)
{
var hasConverter = typeToConvert.GetCustomAttributes<TypeConverterAttribute>().Any();
return hasConverter;
}
public override JsonConverter? CreateConverter(Type typeToConvert, JsonSerializerOptions options)
{
var converter = TypeDescriptor.GetConverter(typeToConvert);
return (JsonConverter?)Activator.CreateInstance(
typeof(TypeConverterJsonAdapter<>).MakeGenericType(typeToConvert),
new object?[] { converter });
}
private sealed class TypeConverterJsonAdapter<T> : JsonConverter<T>
{
private readonly TypeConverter _typeConverter;
public TypeConverterJsonAdapter(TypeConverter typeConverter)
{
_typeConverter = typeConverter;
}
public override T Read(
ref Utf8JsonReader reader,
Type typeToConvert,
JsonSerializerOptions options)
{
var text = reader.GetString();
return (T)_typeConverter.ConvertFromString(text!)!;
}
public override void Write(
Utf8JsonWriter writer,
T objectToWrite,
JsonSerializerOptions options)
{
if (objectToWrite == null)
{
writer.WriteNullValue();
return;
}
var text = _typeConverter.ConvertToString(objectToWrite);
writer.WriteStringValue(text);
}
public override T ReadAsPropertyName(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var text = reader.GetString();
return (T)_typeConverter.ConvertFromString(text!)!;
}
public override void WriteAsPropertyName(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
{
var text = _typeConverter.ConvertToString(value);
writer.WritePropertyName(text!);
}
}
}
}