/// <summary>
/// Creates the silent event args list.
/// </summary>
/// <param name="suspensionContext">The suspension context.</param>
/// <typeparam name="T">The type of collection item.</typeparam>
/// <returns>The <see cref="ICollection{NotifyRangedCollectionChangedEventArgs}"/>.</returns>
public static ICollection <NotifyRangedCollectionChangedEventArgs> CreateSilentEvents <T>(this SuspensionContext <T> suspensionContext)
{
Argument.IsNotNull(nameof(suspensionContext), suspensionContext);
Argument.IsValid(nameof(suspensionContext.Mode), suspensionContext.Mode, mode => mode == SuspensionMode.Silent);
return(ArrayShim.Empty <NotifyRangedCollectionChangedEventArgs>());
}
/// <summary>
/// The create event args list.
/// </summary>
/// <param name="suspensionContext">The suspension context.</param>
/// <typeparam name="T">The type of collection item.</typeparam>
/// <returns>The <see cref="ICollection{NotifyRangedCollectionChangedEventArgs}"/>.</returns>
public static ICollection <NotifyRangedCollectionChangedEventArgs> CreateEvents <T>(this SuspensionContext <T> suspensionContext)
{
// No suspension context is the same as None mode
var mode = suspensionContext?.Mode ?? SuspensionMode.None;
// Fast return for no items in not None modes
if (mode != SuspensionMode.None && suspensionContext?.ChangedItems.Count == 0)
{
return(ArrayShim.Empty <NotifyRangedCollectionChangedEventArgs>());
}
if (!SuspensionContext <T> .EventsGeneratorsRegistry.Value.TryGetValue(mode, out var createEvents))
{
// ReSharper disable once LocalizableElement
throw new ArgumentOutOfRangeException(nameof(mode), $"The suspension mode '{mode}' is unhandled.");
}
return(createEvents(suspensionContext));
}
/// <summary>
/// Converts the collection to an array.
/// </summary>
/// <param name="collection">The collection.</param>
/// <param name="elementType">Type of the element.</param>
/// <returns>Array.</returns>
public static Array ToArray(this IEnumerable collection, Type elementType)
{
Argument.IsNotNull("elementType", elementType);
var internalList = new List <object>(collection != null ? collection.Cast <object>() : ArrayShim.Empty <object>());
var array = Array.CreateInstance(elementType, internalList.Count);
var index = 0;
foreach (var item in internalList)
{
array.SetValue(item, index++);
}
return(array);
}
