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Added InsertRange #22

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Added InsertRange #22

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ca2e289
Added InsertRange
Jun 13, 2017
55ca84a
Create ObservableRangeCollection.cs
Jun 13, 2017
9bfc0b0
Missing namespace
Jun 13, 2017
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27 changes: 27 additions & 0 deletions MvvmHelpers/ObservableRangeCollection.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;


namespace MvvmHelpers
Expand Down Expand Up @@ -103,6 +104,32 @@ public void RemoveRange(IEnumerable<T> collection, NotifyCollectionChangedAction
OnPropertyChanged(new PropertyChangedEventArgs("Item[]"));
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, changedItems, -1));
}

/// <summary>
/// Insert a collection in the specified index keeping the order of the specified collection
/// </summary>
public void InsertRange(int index, IEnumerable<T> collection)
{
if (collection == null)
throw new ArgumentNullException(nameof(collection));

if (collection.Count() == 0)
return;

CheckReentrancy();

// Reverse items to insert from last to start
foreach (T item in collection.Reverse())
{
Items.Insert(index, item);
}

OnPropertyChanged(new PropertyChangedEventArgs("Count"));
OnPropertyChanged(new PropertyChangedEventArgs("Item[]"));

// Casted collection to IList to use the overload that take an IList and have a better NotifyCollectionChangedEventArgs to use
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, (IList)collection, index));
}

/// <summary>
/// Clears the current collection and replaces it with the specified item.
Expand Down