public void BeginEndBulkOperationTest()
{
DictionaryChangedEventArgs <int, string> args = null;
var dictionary = new ObservableDictionary <int, string>();
dictionary.DictionaryChanged += (sender, e) => args = e;
dictionary.BeginBatch();
dictionary.Add(1, "1");
Assert.IsNull(args);
dictionary.Add(2, "2");
Assert.IsNull(args);
dictionary.EndBatch();
Assert.IsNotNull(args);
args = null;
dictionary.BeginBatch();
dictionary.AddRange(MakeTestPairs(4, 5, 6));
Assert.IsNull(args);
dictionary.Add(10, "10");
Assert.IsNull(args);
dictionary.Remove(4);
Assert.IsNull(args);
dictionary[4] = "44";
Assert.IsNull(args);
dictionary[44] = "44";
Assert.IsNull(args);
dictionary.Clear();
Assert.IsNull(args);
dictionary.EndBatch();
Assert.IsNotNull(args);
}
public void OperationCollapseTest()
{
var argsList = new List <DictionaryChangedEventArgs <int, string> >();
var dictionary = new ObservableDictionary <int, string>();
dictionary.DictionaryChanged += (sender, e) => argsList.Add(e);
dictionary.BeginBatch();
dictionary.Add(1, "1"); // \
dictionary.Add(2, "2"); // > collapse into [0] add
dictionary.Add(3, "3"); // /
dictionary.Remove(1); // \
dictionary.Remove(2); // > collapse into [1] remove
dictionary.Remove(3); // /
dictionary.AddRange(MakeTestPairs(1, 2, 3)); // \
dictionary.Add(4, "4"); // > collapse into [2] add
dictionary.AddRange(MakeTestPairs(5, 6, 7)); // /
dictionary.Remove(7); // \
dictionary.Remove(6); // > collapse into [3] reset
dictionary.Clear(); // /
dictionary[1] = "1"; // \
dictionary[2] = "2"; // > collapse into [4] add
dictionary[3] = "3"; // /
dictionary[1] = "1234"; // no collapse - [5] replace
dictionary.Remove(1); // \
dictionary.Clear(); // / collapse into [6] reset
Assert.AreEqual(0, argsList.Count);
dictionary.EndBatch();
Assert.AreEqual(7, argsList.Count);
Assert.AreEqual(NotifyCollectionChangedAction.Add, argsList[0].Action);
Assert.IsTrue(Enumerable.SequenceEqual(MakeTestPairs(1, 2, 3), argsList[0].NewItems));
Assert.AreEqual(NotifyCollectionChangedAction.Remove, argsList[1].Action);
Assert.IsTrue(Enumerable.SequenceEqual(MakeTestPairs(1, 2, 3), argsList[1].OldItems));
Assert.AreEqual(NotifyCollectionChangedAction.Add, argsList[2].Action);
Assert.IsTrue(Enumerable.SequenceEqual(MakeTestPairs(1, 2, 3, 4, 5, 6, 7), argsList[2].NewItems));
Assert.AreEqual(NotifyCollectionChangedAction.Reset, argsList[3].Action);
Assert.AreEqual(NotifyCollectionChangedAction.Add, argsList[4].Action);
Assert.IsTrue(Enumerable.SequenceEqual(MakeTestPairs(1, 2, 3), argsList[4].NewItems));
Assert.AreEqual(NotifyCollectionChangedAction.Replace, argsList[5].Action);
Assert.AreEqual(NotifyCollectionChangedAction.Reset, argsList[6].Action);
}