/// <summary>
/// Processes the value.
/// </summary>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
public override object ProcessValue()
{
object result = this.Value;
var propertyType = this.Context.PropertyDescriptor.PropertyType;
var propertyIsEnumerableType = Direction == EnumerableConvertionDirection.Automatic
? propertyType.IsEnumerableType() &&
!(propertyType == typeof(string))
: Direction == EnumerableConvertionDirection.ToEnumerable;
if (this.Value != null)
{
var valueType = this.Value.GetType();
var valueIsEnumerableType = valueType.IsEnumerableType() &&
!(this.Value is string);
if (propertyIsEnumerableType)
{
if (!valueIsEnumerableType)
{
// Property is enumerable, but value isn't, so make enumerable
var arr = Array.CreateInstance(valueType, 1);
arr.SetValue(this.Value, 0);
result = arr;
}
}
else
{
if (valueIsEnumerableType)
{
// Property is not enumerable, but value is, so grab first item
var enumerator = ((IEnumerable)this.Value).GetEnumerator();
result = enumerator.MoveNext() ? enumerator.Current : null;
}
}
}
else
{
if (propertyIsEnumerableType)
{
if (propertyType.IsInterface && !propertyType.IsEnumerableOfKeyValueType())
{
// Value is null, but property is enumerable interface, so return empty enumerable
result = EnumerableInvocations.Empty(propertyType.GenericTypeArguments.First());
}
else
{
// Concrete enumerables cannot be cast from Array so we create an instance and return it
// if we know it has an empty constructor.
var constructorParams = propertyType.GetConstructorParameters();
if (constructorParams != null && constructorParams.Length == 0)
{
// Internally this uses Activator.CreateInstance which is heavily optimized.
result = propertyType.GetInstance();
}
}
}
}
return(result);
}
/// <summary>
/// Gets a collection of the given type from the given <see cref="IEnumerable{IPublishedContent}"/>.
/// </summary>
/// <param name="items">
/// The <see cref="IEnumerable{IPublishedContent}"/> to convert.
/// </param>
/// <param name="type">
/// The <see cref="Type"/> of items to return.
/// </param>
/// <param name="documentTypeAlias">
/// The document type alias.
/// </param>
/// <param name="convertingType">
/// The <see cref="Action{ConvertingTypeEventArgs}"/> to fire when converting.
/// </param>
/// <param name="convertedType">
/// The <see cref="Action{ConvertedTypeEventArgs}"/> to fire when converted.
/// </param>
/// <param name="culture">
/// The <see cref="CultureInfo"/>.
/// </param>
/// <returns>
/// The resolved <see cref="IEnumerable{T}"/>.
/// </returns>
public static IEnumerable <object> As(
this IEnumerable <IPublishedContent> items,
Type type,
string documentTypeAlias = null,
Action <ConvertingTypeEventArgs> convertingType = null,
Action <ConvertedTypeEventArgs> convertedType = null,
CultureInfo culture = null)
{
using (DisposableTimer.DebugDuration <IEnumerable <object> >(string.Format("IEnumerable As ({0})", documentTypeAlias)))
{
IEnumerable <object> typedItems;
if (string.IsNullOrWhiteSpace(documentTypeAlias))
{
typedItems = items.Select(x => x.As(type, convertingType, convertedType, culture));
}
else
{
typedItems = items.Where(x => documentTypeAlias.InvariantEquals(x.DocumentTypeAlias))
.Select(x => x.As(type, convertingType, convertedType, culture));
}
// We need to cast back here as nothing is strong typed anymore.
return((IEnumerable <object>)EnumerableInvocations.Cast(type, typedItems));
}
}
/// <summary>
/// Gets a collection of the given type from the given <see cref="IEnumerable{IPublishedContent}"/>.
/// </summary>
/// <param name="items">
/// The <see cref="IEnumerable{IPublishedContent}"/> to convert.
/// </param>
/// <param name="type">
/// The <see cref="Type"/> of items to return.
/// </param>
/// <param name="culture">
/// The <see cref="CultureInfo"/>.
/// </param>
/// <param name="valueResolverContexts">
/// A collection of <see cref="DittoValueResolverContext"/> entities to use whilst resolving values.
/// </param>
/// <param name="onConverting">
/// The <see cref="Action{ConversionHandlerContext}"/> to fire when converting.
/// </param>
/// <param name="onConverted">
/// The <see cref="Action{ConversionHandlerContext}"/> to fire when converted.
/// </param>
/// <returns>
/// The resolved <see cref="IEnumerable{T}"/>.
/// </returns>
public static IEnumerable <object> As(
this IEnumerable <IPublishedContent> items,
Type type,
CultureInfo culture = null,
IEnumerable <DittoValueResolverContext> valueResolverContexts = null,
Action <DittoConversionHandlerContext> onConverting = null,
Action <DittoConversionHandlerContext> onConverted = null)
{
using (DittoDisposableTimer.DebugDuration <IEnumerable <object> >("IEnumerable As"))
{
var typedItems = items.Select(x => x.As(type, culture, null, valueResolverContexts, onConverting, onConverted));
// We need to cast back here as nothing is strong typed anymore.
return((IEnumerable <object>)EnumerableInvocations.Cast(type, typedItems));
}
}
/// <summary>
/// Gets a collection of the given type from the given <see cref="IEnumerable{IPublishedContent}"/>.
/// </summary>
/// <param name="items">
/// The <see cref="IEnumerable{IPublishedContent}"/> to convert.
/// </param>
/// <param name="type">
/// The <see cref="Type"/> of items to return.
/// </param>
/// <param name="culture">
/// The <see cref="CultureInfo"/>.
/// </param>
/// <param name="processorContexts">
/// A collection of <see cref="DittoProcessorContext"/> entities to use whilst processing values.
/// </param>
/// <param name="onConverting">
/// The <see cref="Action{ConversionHandlerContext}"/> to fire when converting.
/// </param>
/// <param name="onConverted">
/// The <see cref="Action{ConversionHandlerContext}"/> to fire when converted.
/// </param>
/// <param name="chainContext">
/// The <see cref="DittoChainContext"/> for the current processor chain.
/// </param>
/// <returns>
/// The converted <see cref="IEnumerable{T}"/>.
/// </returns>
public static IEnumerable <object> As(
this IEnumerable <IPublishedContent> items,
Type type,
CultureInfo culture = null,
IEnumerable <DittoProcessorContext> processorContexts = null,
Action <DittoConversionHandlerContext> onConverting = null,
Action <DittoConversionHandlerContext> onConverted = null,
DittoChainContext chainContext = null)
{
using (DittoDisposableTimer.DebugDuration <Ditto>($"IEnumerable As<{type.Name}>"))
{
var typedItems = items.Select(x => x.As(type, culture, null, processorContexts, onConverting, onConverted, chainContext));
// We need to cast back here as nothing is strong typed anymore.
return((IEnumerable <object>)EnumerableInvocations.Cast(type, typedItems));
}
}
/// <summary>Returns the processed value for the given type and property.</summary>
/// <param name="content">The content.</param>
/// <param name="mappableProperty">Information about the mappable property.</param>
/// <param name="baseProcessorContext">The base processor context.</param>
/// <param name="chainContext">The <see cref="DittoChainContext"/> for the current processor chain.</param>
/// <returns>Returns the processed value.</returns>
private static object DoGetProcessedValue(
IPublishedContent content,
DittoTypeInfo.DittoTypePropertyInfo mappableProperty,
DittoProcessorContext baseProcessorContext,
DittoChainContext chainContext)
{
// Create holder for value as it's processed
object currentValue = content;
// Process attributes
foreach (var processorAttr in mappableProperty.Processors)
{
using (DittoDisposableTimer.DebugDuration(typeof(Ditto), $"Processor '{processorAttr}' ({content.Id})"))
{
// Get the right context type
var ctx = chainContext.ProcessorContexts.GetOrCreate(baseProcessorContext, processorAttr.ContextType);
// Populate UmbracoContext & ApplicationContext
processorAttr.UmbracoContext = ContextAccessor.UmbracoContext;
processorAttr.ApplicationContext = ContextAccessor.ApplicationContext;
// Process value
currentValue = processorAttr.ProcessValue(currentValue, ctx, chainContext);
}
}
// The following has to happen after all the processors.
if (mappableProperty.IsEnumerable && currentValue != null && currentValue.Equals(Enumerable.Empty <object>()))
{
if (mappableProperty.PropertyInfo.PropertyType.IsInterface)
{
// You cannot set an enumerable of type from an empty object array.
currentValue = EnumerableInvocations.Cast(mappableProperty.EnumerableType, (IEnumerable)currentValue);
}
else
{
// This should allow the casting back of IEnumerable<T> to an empty List<T> Collection<T> etc.
// I cant think of any that don't have an empty constructor
currentValue = mappableProperty.PropertyInfo.PropertyType.GetInstance();
}
}
return(currentValue == null && mappableProperty.PropertyInfo.PropertyType.IsValueType
? mappableProperty.PropertyInfo.PropertyType.GetInstance() // Set to default instance of value type
: currentValue);
}
/// <summary>
/// Processes the value.
/// </summary>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
/// <exception cref="System.NotImplementedException"></exception>
public override object ProcessValue()
{
object result = Value;
var propertyIsEnumerableType = Context.PropertyDescriptor.PropertyType.IsEnumerableType() &&
!Context.PropertyDescriptor.PropertyType.IsEnumerableOfKeyValueType() &&
!(Context.PropertyDescriptor.PropertyType == typeof(string));
if (Value != null)
{
var valueIsEnumerableType = Value.GetType().IsEnumerableType() &&
!Value.GetType().IsEnumerableOfKeyValueType() &&
!(Value is string);
if (propertyIsEnumerableType)
{
if (!valueIsEnumerableType)
{
// Property is enumerable, but value isn't, so make enumerable
var arr = Array.CreateInstance(Value.GetType(), 1);
arr.SetValue(Value, 0);
result = arr;
}
}
else
{
if (valueIsEnumerableType)
{
// Property is not enumerable, but value is, so grab first item
var enumerator = ((IEnumerable)Value).GetEnumerator();
result = enumerator.MoveNext() ? enumerator.Current : null;
}
}
}
else
{
if (propertyIsEnumerableType)
{
// Value is null, but property is enumerable, so return empty enumerable
result = EnumerableInvocations.Empty(Context.PropertyDescriptor.PropertyType.GenericTypeArguments.First());
}
}
return(result);
}
/// <summary>
/// Converts the given object to the type of this converter, using the specified context and culture information.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context.</param>
/// <param name="culture">The <see cref="T:System.Globalization.CultureInfo" /> to use as the current culture.</param>
/// <param name="value">The <see cref="T:System.Object" /> to convert.</param>
/// <returns>
/// An <see cref="T:System.Object" /> that represents the converted value.
/// </returns>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
if (context == null || context.PropertyDescriptor == null)
{
return(Enumerable.Empty <object>());
}
var propertyType = context.PropertyDescriptor.PropertyType;
var isGenericType = propertyType.IsGenericType;
var targetType = isGenericType
? propertyType.GenericTypeArguments.First()
: propertyType;
if (value.IsNullOrEmptyString())
{
return(EnumerableInvocations.Empty(targetType));
}
// DictionaryPublishedContent
IPublishedContent content = value as IPublishedContent;
if (content != null)
{
// Use the id so we get folder sanitation.
return(this.ConvertMediaFromInt(content.Id, targetType, culture));
}
// If a single item is selected, this is passed as an int, not a string.
if (value is int)
{
var id = (int)value;
return(this.ConvertMediaFromInt(id, targetType, culture).YieldSingleItem());
}
var s = value as string;
if (!string.IsNullOrWhiteSpace(s))
{
var multiMediaPicker = EnumerableInvocations.Empty(targetType);
int n;
var nodeIds =
XmlHelper.CouldItBeXml(s)
? s.GetXmlIds()
: s
.ToDelimitedList()
.Select(x => int.TryParse(x, NumberStyles.Any, culture, out n) ? n : -1)
.Where(x => x > 0)
.ToArray();
if (nodeIds.Any())
{
multiMediaPicker = nodeIds.ForEach(i => this.ConvertMediaFromInt(i, targetType, culture));
}
return(multiMediaPicker);
}
return(base.ConvertFrom(context, culture, value));
}
/// <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);
}
/// <summary>
/// Processes the value.
/// </summary>
/// <returns>
/// The <see cref="object" /> representing the processed value.
/// </returns>
public override object ProcessValue()
{
var propType = this.Context.PropertyDescriptor.PropertyType;
var propTypeIsEnumerable = propType.IsEnumerableType();
var baseType = propTypeIsEnumerable ? propType.GetEnumerableType() : propType;
// We have an enumerable processor that runs at the end of every conversion
// converting individual instances to IEnumerables and vica versa, so we
// won't worry about returning in the right way, rather we'll just ensure
// that the IPublishedContent's are converted to the right types
// and let the enumerable processor handle the rest.
// TODO: Validate the base type more?
// Get the list of types to search through
// If we have explicitly set a list of allowed types, just use those
// otherwise attempt to search through loaded assemblies
IEnumerable <Type> types;
if (AllowedTypes != null && AllowedTypes.Length > 0)
{
types = AllowedTypes;
}
else
{
types = (IEnumerable <Type>)ApplicationContext.ApplicationCache.StaticCache.GetCacheItem(
$"DittoFactoryAttribute_ResolveTypes_{baseType.AssemblyQualifiedName}",
() =>
{
// Workaround for http://issues.umbraco.org/issue/U4-9011
if (baseType.Assembly.IsAppCodeAssembly())
{
// This logic is taken from the core type finder so it should be performing the same checks.
return(baseType.Assembly
.GetTypes()
.Where(t => baseType.IsAssignableFrom(t) &&
t.IsClass &&
!t.IsAbstract &&
!t.IsSealed &&
!t.IsNestedPrivate &&
t.GetCustomAttribute <HideFromTypeFinderAttribute>(true) == null)
.ToArray());
}
// Find the appropriate types
// There is no non generic version of ResolveTypes so we have to
// call it via reflection.
var method = typeof(PluginManager).GetMethod("ResolveTypes");
var generic = method.MakeGenericMethod(baseType);
return(((IEnumerable <Type>)generic.Invoke(PluginManager.Current, new object[] { true, null })).ToArray());
});
}
// Check for IEnumerable<IPublishedContent> value
if (this.Value is IEnumerable <IPublishedContent> enumerableValue && enumerableValue != null)
{
var items = enumerableValue.Select(x =>
{
var typeName = this.ResolveTypeName(x);
var type = types.FirstOrDefault(y => y.Name.InvariantEquals(typeName));
return(type != null ? x.As(type, chainContext: ChainContext) : null);
});
return(EnumerableInvocations.Cast(baseType, items));
}
// Check for IPublishedContent value
if (this.Value is IPublishedContent ipublishedContentValue && ipublishedContentValue != null)
{
var typeName = this.ResolveTypeName(ipublishedContentValue);
var type = types.FirstOrDefault(y => y.Name.InvariantEquals(typeName));
return(type != null
? ipublishedContentValue.As(type, chainContext : ChainContext)
: null);
}
// No other possible options
return(null);
}
/// <summary>
/// Returns the processed value for the given type and property.
/// </summary>
/// <param name="content">The content.</param>
/// <param name="propertyInfo">The property information.</param>
/// <param name="contextAccessor">The context accessor.</param>
/// <param name="baseProcessorContext">The base processor context.</param>
/// <param name="chainContext">The <see cref="DittoChainContext"/> for the current processor chain.</param>
/// <returns>Returns the processed value.</returns>
private static object DoGetProcessedValue(
IPublishedContent content,
PropertyInfo propertyInfo,
IDittoContextAccessor contextAccessor,
DittoProcessorContext baseProcessorContext,
DittoChainContext chainContext)
{
// Check the property for any explicit processor attributes
var processorAttrs = propertyInfo.GetCustomAttributes <DittoProcessorAttribute>(true)
.OrderBy(x => x.Order)
.ToList();
if (!processorAttrs.Any())
{
// Adds the default processor for this conversion
processorAttrs.Add(DittoProcessorRegistry.Instance.GetDefaultProcessorFor(baseProcessorContext.TargetType));
}
var propertyType = propertyInfo.PropertyType;
// Check for type registered processors
processorAttrs.AddRange(propertyType
.GetCustomAttributes <DittoProcessorAttribute>(true)
.OrderBy(x => x.Order));
// Check any type arguments in generic enumerable types.
// This should return false against typeof(string) etc also.
var typeInfo = propertyType.GetTypeInfo();
bool isEnumerable = false;
Type typeArg = null;
if (propertyType.IsCastableEnumerableType())
{
typeArg = typeInfo.GenericTypeArguments.First();
processorAttrs.AddRange(typeInfo
.GenericTypeArguments
.First()
.GetCustomAttributes <DittoProcessorAttribute>(true)
.OrderBy(x => x.Order)
.ToList());
isEnumerable = true;
}
// Check for globally registered processors
processorAttrs.AddRange(DittoProcessorRegistry.Instance.GetRegisteredProcessorAttributesFor(propertyInfo.PropertyType));
// Add any core processors onto the end
processorAttrs.AddRange(DittoProcessorRegistry.Instance.GetPostProcessorAttributes());
// Create holder for value as it's processed
object currentValue = content;
// Process attributes
foreach (var processorAttr in processorAttrs)
{
using (DittoDisposableTimer.DebugDuration <Ditto>($"Processor '{processorAttr.GetType().Name}' ({content.Id})"))
{
// Get the right context type
var ctx = chainContext.ProcessorContexts.GetOrCreate(baseProcessorContext, processorAttr.ContextType);
// Populate UmbracoContext & ApplicationContext
processorAttr.UmbracoContext = contextAccessor.UmbracoContext;
processorAttr.ApplicationContext = contextAccessor.ApplicationContext;
// Process value
currentValue = processorAttr.ProcessValue(currentValue, ctx, chainContext);
}
}
// The following has to happen after all the processors.
if (isEnumerable && currentValue != null && currentValue.Equals(Enumerable.Empty <object>()))
{
if (propertyType.IsInterface)
{
// You cannot set an enumerable of type from an empty object array.
currentValue = EnumerableInvocations.Cast(typeArg, (IEnumerable)currentValue);
}
else
{
// This should allow the casting back of IEnumerable<T> to an empty List<T> Collection<T> etc.
// I cant think of any that don't have an empty constructor
currentValue = propertyType.GetInstance();
}
}
return((currentValue == null && propertyType.IsValueType)
? propertyInfo.PropertyType.GetInstance() // Set to default instance of value type
: currentValue);
}
/// <summary>
/// Converts the given object to the type of this converter, using the specified context and culture information.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context.</param>
/// <param name="culture">The <see cref="T:System.Globalization.CultureInfo" /> to use as the current culture.</param>
/// <param name="value">The <see cref="T:System.Object" /> to convert.</param>
/// <returns>
/// An <see cref="T:System.Object" /> that represents the converted value.
/// </returns>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
if (context == null || context.PropertyDescriptor == null)
{
// There's no way to determine the type here.
return(null);
}
var propertyType = context.PropertyDescriptor.PropertyType;
var isGenericType = propertyType.IsGenericType;
var targetType = isGenericType
? propertyType.GenericTypeArguments.First()
: propertyType;
if (value.IsNullOrEmptyString())
{
if (isGenericType)
{
return(EnumerableInvocations.Empty(targetType));
}
return(null);
}
// If a single item is selected, this comes back as an int, not a string.
if (value is int)
{
var id = (int)value;
// CheckBoxList, ListBox
if (targetType != null)
{
return(this.ConvertContentFromInt(id, targetType, culture).YieldSingleItem());
}
// AutoComplete, DropDownList, RadioButton
return(this.ConvertContentFromInt(id, propertyType, culture));
}
if (value != null)
{
string s = value as string ?? value.ToString();
if (!string.IsNullOrWhiteSpace(s))
{
int n;
var nodeIds = s
.ToDelimitedList()
.Select(x => int.TryParse(x, NumberStyles.Any, culture, out n) ? n : -1)
.Where(x => x > 0)
.ToArray();
if (nodeIds.Any())
{
var ultimatePicker = new List <IPublishedContent>();
// ReSharper disable once LoopCanBeConvertedToQuery
foreach (var nodeId in nodeIds)
{
var item = UmbracoContext.Current.ContentCache.GetById(nodeId);
if (item != null)
{
ultimatePicker.Add(item);
}
}
// CheckBoxList, ListBox
if (isGenericType)
{
return(ultimatePicker.As(targetType, culture));
}
// AutoComplete, DropDownList, RadioButton
return(ultimatePicker.As(targetType, culture).FirstOrDefault());
}
}
}
return(base.ConvertFrom(context, culture, value));
}
/// <summary>
/// Converts the given object to the type of this converter, using the specified context and culture information.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context.</param>
/// <param name="culture">The <see cref="T:System.Globalization.CultureInfo" /> to use as the current culture.</param>
/// <param name="value">The <see cref="T:System.Object" /> to convert.</param>
/// <returns>
/// An <see cref="T:System.Object" /> that represents the converted value.
/// </returns>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
if (context == null || context.PropertyDescriptor == null)
{
return(Enumerable.Empty <object>());
}
var propertyType = context.PropertyDescriptor.PropertyType;
var isGenericType = propertyType.IsGenericType;
var targetType = isGenericType
? propertyType.GenericTypeArguments.First()
: propertyType;
if (value.IsNullOrEmptyString())
{
return(EnumerableInvocations.Empty(targetType));
}
// Single IPublishedContent
IPublishedContent content = value as IPublishedContent;
if (content != null)
{
return(content.As(targetType, null, null, culture));
}
// ReSharper disable once PossibleNullReferenceException
var type = value.GetType();
// Multiple IPublishedContent
if (type.IsEnumerableOfType(typeof(IPublishedContent)))
{
return(((IEnumerable <IPublishedContent>)value).As(targetType, null, null, null, culture));
}
int[] nodeIds = { };
// First try enumerable strings, ints.
if (type.IsGenericType || type.IsArray)
{
if (type.IsEnumerableOfType(typeof(string)))
{
int n;
nodeIds = ((IEnumerable <string>)value)
.Select(x => int.TryParse(x, NumberStyles.Any, culture, out n) ? n : -1)
.ToArray();
}
if (type.IsEnumerableOfType(typeof(int)))
{
nodeIds = ((IEnumerable <int>)value).ToArray();
}
}
// Now csv strings.
if (!nodeIds.Any())
{
var s = value as string ?? value.ToString();
if (!string.IsNullOrWhiteSpace(s))
{
int n;
nodeIds = XmlHelper.CouldItBeXml(s)
? s.GetXmlIds()
: s
.ToDelimitedList()
.Select(x => int.TryParse(x, NumberStyles.Any, culture, out n) ? n : -1)
.Where(x => x > 0)
.ToArray();
}
}
if (nodeIds.Any())
{
var umbracoContext = UmbracoContext.Current;
var membershipHelper = new MembershipHelper(umbracoContext);
var objectType = UmbracoObjectTypes.Unknown;
var multiPicker = new List <IPublishedContent>();
// Oh so ugly if you let Resharper do this.
// ReSharper disable once LoopCanBeConvertedToQuery
foreach (var nodeId in nodeIds)
{
var item = this.GetPublishedContent(nodeId, ref objectType, UmbracoObjectTypes.Document, umbracoContext.ContentCache.GetById)
?? this.GetPublishedContent(nodeId, ref objectType, UmbracoObjectTypes.Media, umbracoContext.MediaCache.GetById)
?? this.GetPublishedContent(nodeId, ref objectType, UmbracoObjectTypes.Member, membershipHelper.GetById);
if (item != null)
{
multiPicker.Add(item);
}
}
return(multiPicker.As(targetType, null, null, null, culture));
}
return(base.ConvertFrom(context, culture, value));
}
