private JsonConverter GetConverterFromAttribute(JsonConverterAttribute converterAttribute, Type typeToConvert, Type classTypeAttributeIsOn, PropertyInfo?propertyInfo)
{
JsonConverter?converter;
Type?type = converterAttribute.ConverterType;
if (type == null)
{
// Allow the attribute to create the converter.
converter = converterAttribute.CreateConverter(typeToConvert);
if (converter == null)
{
ThrowHelper.ThrowInvalidOperationException_SerializationConverterOnAttributeNotCompatible(classTypeAttributeIsOn, propertyInfo, typeToConvert);
}
}
else
{
ConstructorInfo?ctor = type.GetConstructor(Type.EmptyTypes);
if (!typeof(JsonConverter).IsAssignableFrom(type) || ctor == null || !ctor.IsPublic)
{
ThrowHelper.ThrowInvalidOperationException_SerializationConverterOnAttributeInvalid(classTypeAttributeIsOn, propertyInfo);
}
converter = (JsonConverter)Activator.CreateInstance(type) !;
}
Debug.Assert(converter != null);
if (!converter.CanConvert(typeToConvert))
{
ThrowHelper.ThrowInvalidOperationException_SerializationConverterOnAttributeNotCompatible(classTypeAttributeIsOn, propertyInfo, typeToConvert);
}
return(converter);
}
private JsonConverter GetConverterFromAttribute(JsonConverterAttribute converterAttribute, Type typeToConvert, Type classTypeAttributeIsOn, MemberInfo?memberInfo)
{
JsonConverter?converter;
Type?type = converterAttribute.ConverterType;
if (type == null)
{
// Allow the attribute to create the converter.
converter = converterAttribute.CreateConverter(typeToConvert);
if (converter == null)
{
ThrowHelper.ThrowInvalidOperationException_SerializationConverterOnAttributeNotCompatible(classTypeAttributeIsOn, memberInfo, typeToConvert);
}
}
else
{
ConstructorInfo?ctor = type.GetConstructor(Type.EmptyTypes);
if (!typeof(JsonConverter).IsAssignableFrom(type) || ctor == null || !ctor.IsPublic)
{
ThrowHelper.ThrowInvalidOperationException_SerializationConverterOnAttributeInvalid(classTypeAttributeIsOn, memberInfo);
}
converter = (JsonConverter)Activator.CreateInstance(type) !;
}
Debug.Assert(converter != null);
if (!converter.CanConvert(typeToConvert))
{
Type?underlyingType = Nullable.GetUnderlyingType(typeToConvert);
if (underlyingType != null && converter.CanConvert(underlyingType))
{
if (converter is JsonConverterFactory converterFactory)
{
converter = converterFactory.GetConverterInternal(underlyingType, this);
}
// Allow nullable handling to forward to the underlying type's converter.
return(NullableConverterFactory.CreateValueConverter(underlyingType, converter));
}
ThrowHelper.ThrowInvalidOperationException_SerializationConverterOnAttributeNotCompatible(classTypeAttributeIsOn, memberInfo, typeToConvert);
}
return(converter);
}
