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Dim products As New List(Of Product)() Try con.Open() Dim reader As SqlDataReader = cmd.ExecuteReader() Do While reader.Read() ' Create a Product object that wraps the ' current record. Dim product As New Product(CStr(reader("ModelNumber")), _ CStr(reader("ModelName")), CDec(reader("UnitCost")), _ CStr(reader("Description"))) ' Add to collection products.Add(product) Loop Finally con.Close() End Try Return products End Function When the Get Products button is clicked, the event handling code calls the GetProducts() method and supplies it as the ItemsSource for list. The collection is also stored as a member variable in the window class for easier access elsewhere in your code. Private products As List(Of Product) Private Sub cmdGetProducts_Click(ByVal sender As Object, _ ByVal e As RoutedEventArgs) products = Application.StoreDB.GetProducts() lstProducts.ItemsSource = products End Sub This successfully fills the list with Product objects. However, the list doesn t know how to display a product object, so it will simply call the ToString() method. Because this method hasn t been overridden in the Product class, this has the unimpressive result of showing the fully qualified class name for every item (see Figure 16-9).

String^ t = dict[3]; Console::WriteLine("dict[3] = {0}\n", t); Console::WriteLine("Sorted Values:"); for each (String ^s in dict->Values) Console::WriteLine("\t{0}",s); Console::WriteLine(); for each (KeyValuePair<int,String^>^ pair in dict) { Console::WriteLine("Key = [{0}]\tValue = [{1}]", pair->Key, pair->Value); } Console::WriteLine("\nSortedDictionary contains 'Six' [{0}]", dict->ContainsValue("Six")); dict->Remove(6); Console::WriteLine("\nSortedDictionary had 'Six' removed [{0}]\n", !dict->ContainsValue("Six")); SortedDictionary<int,String^>::KeyCollection::Enumerator ^key = dict->Keys->GetEnumerator(); SortedDictionary<int,String^>::ValueCollection::Enumerator ^value = dict->Values->GetEnumerator(); while ( key->MoveNext() && value->MoveNext()) { Console::WriteLine("Key = [{0}]\tValue = [{1}]", key->Current, value->Current); } }

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Figure 16-9. An unhelpful bound list You have three options to solve this problem: Set the DisplayMemberPath property of the list. For example, set this to ModelName to get the result shown in Figure 16-9. Override the ToString() method to return more useful information. For example, you could return a string with the model number and model name of each item. This approach gives you a way to show more than one property in the list (for example, it s great for combining the FirstName and LastName property in a Customer class). However, you still don t have much control over how the data is presented. Supply a data template. This way, you can show any arrangement of property values (and along with fixed text). You ll learn how to use this trick in 17. Once you ve decided how to display information in the list, you re ready to move on to the second challenge: displaying the details for the currently selected item in the grid that appears below the list. You could handle this challenge by responding to the SelectionChanged event

state (i.e., you cannot do a Get Latest, and it retrieves the latest version of the proxy server, which is actually two versions behind the central server). This can help ease the burden of slow connections on remote teams.

and manually changing the data context of the grid, but there s a quicker approach that doesn t require any code. You simply need to set a binding expression for the Grid.DataContent property that pulls the selected Product object out of the list, as shown here: <Grid DataContext="{Binding ElementName=lstProducts, Path=SelectedItem}"> ... </Grid> When the window first appears, nothing is selected in the list. The ListBox.SelectedItem property is a null reference (Nothing), and therefore the Grid.DataContext is too, and no information appears. As soon as you select an item, the data context is set to the corresponding object, and all the information appears. If you try this example, you ll be surprised to see that it s already fully functional. You can edit product items, navigate away (using the list), and then return to see that your edits were successfully committed. In fact, you can even change a value that affects the display text in the list. If you modify the model name and tab to another control, the corresponding entry in the list is refreshed automatically. (Experienced developers will recognize this as a frill that Windows Forms applications lacked.)

void main() { Console::WriteLine("Dictionary\n----------"); Dictionary<int,String^>^ dict = DictionaryExample(); Console::WriteLine(); Console::WriteLine("\nReverse SortedDictionary\n----------------"); SortedDictionaryExample(dict); Console::WriteLine(); } Figure 7-13 shows the results of the DictionaryGeneric.exe program.

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