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Private Sub Window_Loaded( ByVal sender As SystemObject, ByVal e As SystemWindowsRoutedEventArgs) Handles MyBaseLoaded Dim OrderViewSource As CollectionViewSource = CType(FindResource("OrderViewSource"), CollectionViewSource) OrderViewSourceSource = New List(Of Order) From { New Order With { OrderDate = DateTimeNow } } CustomerIDComboBoxItemsSource = From cust In New MyShopDataContext()Customers End Sub
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The previous re-write of Window_Loaded accomplishes two things: assigning an order to orderViewSource and populating customerIDComboBox with customers The Order object assigned to the Source property of orderViewSource is empty, except assigning today s date to OrderDate, demonstrating how you can set default values When the user fills out the form on the page, WPF will populate this Order with data because it is data bound, through orderViewSource, to the controls on the screen This section showed you how the data is assigned to the controls, but some controls require even more attention to ensure they display the data correctly The next section expands upon what you must do to get the ComboBox to work
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A couple of the particularly more complex controls to configure are ComboBox and ListBox The reason is that they have a few different properties that must be set to ensure that whatever is selected can be read and correctly referenced back to the original data source This section doesn t try to teach you about WPF binding because there are entire books with multiple chapters related to the subject Instead, you ll learn an essential skill for helping you figure out how to set the right properties on a ComboBox control In so doing, you ll get a better feel for the features of VS that help you perform the task of setting up controls
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The previous example assigns the results of a LINQ query for Customer objects to the customerIDComboBox, but this is only the first step to getting the combo box to work properly; you must specify which property of Customer must display, which property of Customer maps to Order, and which property of Order to bind the selected item to To do this binding, open the NewOrderxaml file in the Designer, select the combo box, and set the properties as specified in Table 8-2 The following XAML shows the results of the settings you should make in the Properties window, based on Table 8-2:
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<ComboBox DisplayMemberPath="Name" SelectedValue="{Binding Path=CustomerID}" SelectedValuePath="CustomerID" GridColumn="1" GridRow="1" Height="23" HorizontalAlignment="Left" Margin="3" Name="customerIDComboBox" VerticalAlignment="Center" Width="120"> </ComboBox>
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DisplayMemberPath and SelectedValuePath are names of the properties from the Customer objects bound to the ComboBox However, the SelectedValue syntax uses a binding expression, where Path identifies the property of the Order that will be assigned to with SelectedValuePath The binding for SelectedValue is based on the Order object
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ItemsSource
Explanation
We set this through code in the Window_Loaded event It holds the collection of objects that will appear in the combo box You need two properties, one to display and one for the key of the object being displayed The key will be used to map the object back to the database or associate the object in a relationship with another object In the case of the Customer list, the properties of interest are Name for display and CustomerID for key Since we are creating a new Order, the CustomerID for the Name selected in the combo box will be assigned to the CustomerID field of the Order That way, when the Order is saved, its database record will have the CustomerID for the customer the user selected This is the Name property from each Customer object bound to the combo box As explained for ItemsSource, you need to associate the selected Customer with the Order being created SelectedValuePath is the name of the Customer object s key, which is CustomerID in our example When saving the Order, you must have the key associated with the selected customer The SelectedValue is a binding to the property of the Order that will be set with the key from the selected Customer
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