public void ReplaceTest()
{
ObservableCollection <TestClass> testCollection = new ObservableCollection <TestClass>()
{
new TestClass()
{
IntProperty = 1, StringProperty = "C"
},
new TestClass()
{
IntProperty = 2, StringProperty = "A"
},
new TestClass()
{
IntProperty = 3, StringProperty = "D"
},
new TestClass()
{
IntProperty = 4, StringProperty = "B"
},
};
PagedCollectionView cv = new PagedCollectionView(testCollection);
Assert.AreEqual("C", (cv[0] as TestClass).StringProperty);
Assert.AreEqual("A", (cv[1] as TestClass).StringProperty);
Assert.AreEqual("D", (cv[2] as TestClass).StringProperty);
Assert.AreEqual("B", (cv[3] as TestClass).StringProperty);
// replace first item
testCollection[0] = new TestClass()
{
IntProperty = 5, StringProperty = "E"
};
// verify new data (still in same index)
Assert.AreEqual("E", (cv[0] as TestClass).StringProperty);
Assert.AreEqual("A", (cv[1] as TestClass).StringProperty);
Assert.AreEqual("D", (cv[2] as TestClass).StringProperty);
Assert.AreEqual("B", (cv[3] as TestClass).StringProperty);
// now sort and page the data
cv.PageSize = 2;
cv.SortDescriptions.Add(new System.ComponentModel.SortDescription("StringProperty", System.ComponentModel.ListSortDirection.Ascending));
// ----------------
// |Page | 0 | 1 |
// ----------------
// | 0 | A | B | <---- Current Page
// | 1 | D | E |
Assert.AreEqual("A", (cv[0] as TestClass).StringProperty);
Assert.AreEqual("B", (cv[1] as TestClass).StringProperty);
// replace 'B', which is the 4th item in the collection
testCollection[3] = new TestClass()
{
IntProperty = 6, StringProperty = "F"
};
// ----------------
// |Page | 0 | 1 |
// ----------------
// | 0 | A | D | <---- Current Page
// | 1 | E | F | (because of sorting/paging)
Assert.AreEqual("A", (cv[0] as TestClass).StringProperty);
Assert.AreEqual("D", (cv[1] as TestClass).StringProperty);
cv.MoveToNextPage();
Assert.AreEqual("E", (cv[0] as TestClass).StringProperty);
Assert.AreEqual("F", (cv[1] as TestClass).StringProperty);
}