internal BinaryConverter DetermineConverter(Type parentClassType, Type runtimePropertyType, MemberInfo memberInfo)
{
BinaryConverter converter = null !;
// Priority 1: attempt to get converter from BinaryConverterAttribute on property.
if (memberInfo != null)
{
Debug.Assert(parentClassType != null);
BinaryConverterAttribute converterAttribute = (BinaryConverterAttribute)
GetAttributeThatCanHaveMultiple(parentClassType !, typeof(BinaryConverterAttribute), memberInfo);
if (converterAttribute != null)
{
converter = GetConverterFromAttribute(converterAttribute, typeToConvert: runtimePropertyType, classTypeAttributeIsOn: parentClassType !, memberInfo);
}
}
if (converter == null)
{
converter = GetConverter(runtimePropertyType);
Debug.Assert(converter != null);
}
if (converter is BinaryConverterFactory factory)
{
converter = factory.GetConverterInternal(runtimePropertyType, this);
// A factory cannot return null; GetConverterInternal checked for that.
Debug.Assert(converter != null);
}
// 非空类型转换器处理可空类型，引发异常
if (runtimePropertyType.IsNullableType() && !converter.TypeToConvert.IsNullableType())
{
ThrowHelper.ThrowInvalidOperationException_ConverterCanConvertNullableRedundant(runtimePropertyType, converter);
}
return(converter);
}
