protected internal virtual TypeConverter GetTypeConverter()
{
var tca = ClrType.GetCustomAttributes(typeof(TypeConverterAttribute), false).Cast <TypeConverterAttribute>().FirstOrDefault();
if (tca != null)
{
return(Activator.CreateInstance(Type.GetType(tca.ConverterTypeName)) as TypeConverter);
}
if (ClrType.IsEnum
#if NETFX_CORE
()
#endif
)
{
return(new DelegateTypeConverter <object>((context, culture, val) => Enum.Parse(ClrType, val, false)));
}
if (ClrType.IsGenericType
#if NETFX_CORE
()
#endif
&& ClrType.GetGenericTypeDefinition().Equals(typeof(Nullable <>)))
{
var nullableKind = Nullable.GetUnderlyingType(ClrType);
var nullableType = ClrType;
var baseTypeConverter = XamlType.GetXamlType(nullableKind).TypeConverter;
return(new DelegateTypeConverter <object>((context, culture, val) =>
{
var result = baseTypeConverter.ConvertFrom(context, culture, val);
return Activator.CreateInstance(nullableType, result);
}));
}
return(null);
}
internal override IEnumerable <Type> GetChildTypes()
{
// Collect information...
Debug.Assert(
ClrType.IsGenericType() &&
typeof(IGrouping <,>).Equals(ClrType.GetGenericTypeDefinition()));
var keyType = ClrType.GetGenericArguments()[0];
var groupElementType = ClrType.GetGenericArguments()[1];
// key
yield return(keyType);
// group
yield return(typeof(IEnumerable <>).MakeGenericType(groupElementType));
}
internal override Expression Emit(List <TranslatorResult> propertyTranslatorResults)
{
// Create expression of the form:
// new Grouping<K, T>(children[0], children[1])
// Collect information...
Debug.Assert(
ClrType.IsGenericType() &&
typeof(IGrouping <,>).Equals(ClrType.GetGenericTypeDefinition()));
Debug.Assert(propertyTranslatorResults.Count == 2);
var keyType = ClrType.GetGenericArguments()[0];
var groupElementType = ClrType.GetGenericArguments()[1];
var groupType = typeof(Grouping <,>).MakeGenericType(keyType, groupElementType);
var constructor = groupType.GetConstructors().Single();
// new Grouping<K, T>(children[0], children[1])
Expression newGrouping = Expression.Convert(
Expression.New(constructor, GetPropertyReaders(propertyTranslatorResults)), ClrType);
return(newGrouping);
}