/// <summary>
/// Set the typed value to the given instance.
/// </summary>
/// <param name="content">The <see cref="IPublishedContent"/> to convert.</param>
/// <param name="culture">The <see cref="CultureInfo"/></param>
/// <param name="propertyInfo">The <see cref="PropertyInfo"/> property info associated with the type.</param>
/// <param name="propertyValue">The property value.</param>
/// <param name="instance">The instance to assign the value to.</param>
/// <returns>The strong typed converted value for the given property.</returns>
private static object GetConvertedValue(
IPublishedContent content,
CultureInfo culture,
PropertyInfo propertyInfo,
object propertyValue,
object instance)
{
// Process the value.
object result = null;
var propertyType = propertyInfo.PropertyType;
var typeInfo = propertyType.GetTypeInfo();
// This should return false against typeof(string) etc also.
var propertyIsEnumerableType = propertyType.IsCastableEnumerableType();
// Try any custom type converters first.
// 1: Check the property.
// 2: Check any type arguments in generic enumerable types.
// 3: Check the type itself.
var converterAttribute =
propertyInfo.GetCustomAttribute <TypeConverterAttribute>()
?? (propertyIsEnumerableType ? typeInfo.GenericTypeArguments.First().GetCustomAttribute <TypeConverterAttribute>(true)
: propertyType.GetCustomAttribute <TypeConverterAttribute>(true));
if (converterAttribute != null && converterAttribute.ConverterTypeName != null)
{
// Time custom conversions.
using (DittoDisposableTimer.DebugDuration <object>(string.Format("Custom TypeConverter ({0}, {1})", content.Id, propertyInfo.Name)))
{
// Get the custom converter from the attribute and attempt to convert.
var converterType = Type.GetType(converterAttribute.ConverterTypeName);
if (converterType != null)
{
var converter = converterType.GetDependencyResolvedInstance() as TypeConverter;
if (converter != null)
{
// Create context to pass to converter implementations.
// This contains the IPublishedContent and the currently converting property descriptor.
var descriptor = TypeDescriptor.GetProperties(instance)[propertyInfo.Name];
var context = new DittoTypeConverterContext
{
ConversionType = instance.GetType(),
Instance = content,
PropertyDescriptor = descriptor
};
Type propertyValueType = null;
if (propertyValue != null)
{
propertyValueType = propertyValue.GetType();
}
// We're deliberately passing null.
// ReSharper disable once AssignNullToNotNullAttribute
if (converter.CanConvertFrom(context, propertyValueType))
{
object converted = converter.ConvertFrom(context, culture, propertyValue);
if (converted != null)
{
// Handle Typeconverters returning single objects when we want an IEnumerable.
// Use case: Someone selects a folder of images rather than a single image with the media picker.
var convertedType = converted.GetType();
if (propertyIsEnumerableType)
{
var parameterType = typeInfo.GenericTypeArguments.First();
// Some converters return an IEnumerable so we check again.
if (!convertedType.IsEnumerableType())
{
// Using 'Cast' to convert the type back to IEnumerable<T>.
object enumerablePropertyValue = EnumerableInvocations.Cast(
parameterType,
converted.YieldSingleItem());
result = enumerablePropertyValue;
}
else
{
// Nothing is strong typed anymore.
result = EnumerableInvocations.Cast(parameterType, (IEnumerable)converted);
}
}
else
{
// Return single expected items from converters returning an IEnumerable.
// Check for key/value pairs and strings.
if (convertedType.IsEnumerableType() &&
!convertedType.IsEnumerableOfKeyValueType() &&
!(convertedType == typeof(string) && propertyType == typeof(string)))
{
// Use 'FirstOrDefault' to convert the type back to T.
result = EnumerableInvocations.FirstOrDefault(
propertyType,
(IEnumerable)converted);
}
else
{
result = converted;
}
}
}
else
{
// Ensure we pass back an empty enumerable if the expected output is an enumerable.
// and null has been returned by the type converter.
if (propertyIsEnumerableType)
{
result = EnumerableInvocations.Empty(typeInfo.GenericTypeArguments.First());
}
}
}
else if (propertyType.IsInstanceOfType(propertyValue))
{
// If the TypeConverter's `CanConvertFrom` has returned false,
// then we can check if the value is the same type as the target type.
result = propertyValue;
}
}
}
}
}
else if (propertyType == typeof(HtmlString))
{
// Handle Html strings so we don't have to set the attribute.
var converterType = typeof(DittoHtmlStringConverter);
var converter = converterType.GetDependencyResolvedInstance() as TypeConverter;
if (converter != null)
{
// This contains the IPublishedContent and the currently converting property descriptor.
var descriptor = TypeDescriptor.GetProperties(instance)[propertyInfo.Name];
var context = new DittoTypeConverterContext
{
ConversionType = instance.GetType(),
Instance = content,
PropertyDescriptor = descriptor
};
Type propertyValueType = null;
if (propertyValue != null)
{
propertyValueType = propertyValue.GetType();
}
// We're deliberately passing null.
// ReSharper disable once AssignNullToNotNullAttribute
if (converter.CanConvertFrom(context, propertyValueType))
{
result = converter.ConvertFrom(context, culture, propertyValue);
}
}
}
else if (propertyType.IsInstanceOfType(propertyValue))
{
// Simple types
result = propertyValue;
}
else if (propertyValue is IPublishedContent && propertyType.IsClass)
{
// If the property value is an IPublishedContent, then we can use Ditto to map to the target type.
result = ((IPublishedContent)propertyValue).As(propertyType);
}
else if (propertyValue != null &&
propertyValue.GetType().IsEnumerableOfType(typeof(IPublishedContent)) &&
propertyType.IsEnumerable() &&
propertyType.GetEnumerableType() != null &&
propertyType.GetEnumerableType().IsClass)
{
// If the property value is IEnumerable<IPublishedContent>, then we can use Ditto to map to the target type.
result = ((IEnumerable <IPublishedContent>)propertyValue).As(propertyType.GetEnumerableType());
}
else
{
using (DittoDisposableTimer.DebugDuration <object>(string.Format("TypeConverter ({0}, {1})", content.Id, propertyInfo.Name)))
{
var convert = propertyValue.TryConvertTo(propertyType);
if (convert.Success)
{
result = convert.Result;
}
}
}
return(result);
}
