public static CollectionWrapper GetCollectionWrapperInstance(IEnumerable collection, bool shareCollectionPerThread)
{
if (shareCollectionPerThread)
{
lock (CollectionWrapper.collectionWrappers)
{
Dispatcher CurrentDispatcher = Dispatcher.CurrentDispatcher;
if (CollectionWrapper.collectionWrappers.ContainsKey(CurrentDispatcher))
{
return(CollectionWrapper.GetCollectionWrapperInstance(CollectionWrapper.collectionWrappers[CurrentDispatcher], collection,
CurrentDispatcher));
}
else
{
Dictionary <IEnumerable, CollectionWrapper> CollectionWrappers =
new Dictionary <IEnumerable, CollectionWrapper>();
CollectionWrapper.collectionWrappers.Add(CurrentDispatcher, CollectionWrappers);
return(CollectionWrapper.GetCollectionWrapperInstance(CollectionWrappers, collection, CurrentDispatcher));
}
}
}
else
{
return(new CollectionWrapper(collection, Dispatcher.CurrentDispatcher));
}
}
private static CollectionWrapper GetCollectionWrapperInstance(IDictionary <IEnumerable, CollectionWrapper> collectionWrappers, IEnumerable collection, Dispatcher dispatcher)
{
lock (collectionWrappers)
{
if (collectionWrappers.ContainsKey(collection))
{
return(collectionWrappers[collection]);
}
else
{
CollectionWrapper Wrapper = new CollectionWrapper(collection, dispatcher);
collectionWrappers.Add(collection, Wrapper);
return(Wrapper);
}
}
}
/// <summary>
/// Converts a value.
/// </summary>
/// <returns>
/// A converted value. If the method returns null, the valid null value is used.
/// </returns>
/// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
object Collection = value;
if (Collection == null)
{
return(null);
}
else if (Collection is IEnumerable && Collection is INotifyCollectionChanged)
{
return(CollectionWrapper.GetCollectionWrapperInstance((IEnumerable)Collection, this.ShareCollectionPerThread));
}
else
{
throw new InvalidOperationException("Collection to wrap is either not enumerable or does not support INotifyCollectionChanged");
}
}