public void SelectManyWithAverage1()
{
var updates = 0;
var coll = new NotifyCollection<TestItem>();
var query = from item in coll
group item by item.Team into team
let avg = team.Average(it => it.Items)
from item2 in team
where item2.Items < avg
select item2;
var testItem1 = new TestItem() { Items = 1, Team = "A" };
var testItem2 = new TestItem() { Items = 2, Team = "A" };
query.CollectionChanged += (o, e) =>
{
updates++;
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(1, e.NewItems.Count);
Assert.AreSame(testItem1, e.NewItems[0]);
};
coll.Add(testItem1);
Assert.AreEqual(0, updates);
coll.Add(testItem2);
Assert.AreEqual(1, updates);
Assert.AreEqual(1, query.Count());
Assert.IsTrue(query.Contains(testItem1));
}
public void SelectManyWithAverage1()
{
var updates = 0;
INotifyCollection <TestItem> coll = new NotifyCollection <TestItem>();
var query = from item in coll
group item by item.Team into team
let avg = team.Average(it => it.Items)
from item2 in team
where item2.Items < avg
select item2;
var testItem1 = new TestItem()
{
Items = 1, Team = "A"
};
var testItem2 = new TestItem()
{
Items = 2, Team = "A"
};
query.CollectionChanged += (o, e) =>
{
updates++;
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(1, e.NewItems.Count);
Assert.AreSame(testItem1, e.NewItems[0]);
};
coll.Add(testItem1);
Assert.AreEqual(0, updates);
coll.Add(testItem2);
Assert.AreEqual(1, updates);
Assert.AreEqual(1, query.Count());
Assert.IsTrue(query.Contains(testItem1));
}
public void SelectWithAverage2()
{
var updates = 0;
var coll = new ObservableCollection <TestItem>();
var query = from item in coll.WithUpdates()
where item.Items < coll.WithUpdates().Average(t => t.Items)
select item;
var testItem1 = new TestItem()
{
Items = 1, Team = "A"
};
var testItem2 = new TestItem()
{
Items = 2, Team = "A"
};
query.CollectionChanged += (o, e) =>
{
updates++;
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(1, e.NewItems.Count);
Assert.AreSame(testItem1, e.NewItems[0]);
};
coll.Add(testItem2);
Assert.AreEqual(0, updates);
coll.Add(testItem1);
Assert.AreEqual(1, updates);
Assert.AreEqual(1, query.Count());
Assert.IsTrue(query.Contains(testItem1));
}
public void SelectWithAverage2()
{
var updates = 0;
var coll = new NotifyCollection<TestItem>();
var query = from item in coll
where item.Items < coll.Average(t => t.Items)
select item;
var testItem1 = new TestItem() { Items = 1, Team = "A" };
var testItem2 = new TestItem() { Items = 2, Team = "A" };
query.CollectionChanged += (o, e) =>
{
updates++;
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action);
Assert.AreEqual(1, e.NewItems.Count);
Assert.AreSame(testItem1, e.NewItems[0]);
};
coll.Add(testItem2);
Assert.AreEqual(0, updates);
coll.Add(testItem1);
Assert.AreEqual(1, updates);
Assert.AreEqual(1, query.Count());
Assert.IsTrue(query.Contains(testItem1));
}