s WINDOWS FORMS UI in VB.NET

Encoder PDF417 in VB.NET s WINDOWS FORMS UI

CHAPTER 9 s WINDOWS FORMS UI
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Figure 9-13. Data properties for the ListBox control
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The DataSource property points to the ProjectListBindingSource control. Again, this follows the new data binding approach, with which UI controls are bound to BindingSource controls, which in turn are bound to the underlying data source itself. Also notice the DisplayMember and ValueMember properties. DisplayMember indicates the property value from the data source that will be displayed to the user. ValueMember indicates the property from the data source that will be invisibly maintained for each item in the ListBox control. The ListBox control has a SelectedValue property that you can use to get the ValueMember value for the currently selected item in the ListBox. This makes it very easy to retrieve the Id value for the project that the user selected from the list.
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When ProjectSelect is displayed, it presents the user with a list of projects. At this point, the user can either select one and click OK, or click Cancel. Either way, the DialogResult property is set and the form is closed. For instance, here s the code for the Cancel button: Private Sub Cancel_Button_Click( _ ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles Cancel_Button.Click Me.Close() End Sub The DialogResult property is set to Cancel (because the DialogResult property of the Cancel button is set to Cancel) and the form is closed. The code that displayed this dialog in the first place can retrieve the DialogResult value like this: If dlg.ShowDialog = DialogResult.OK Then
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CHAPTER 9 s WINDOWS FORMS UI
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The DialogResult value from the dialog form s code flows through as the result of the ShowDialog() method call in this calling code. If the user clicks the OK button, things are a bit more interesting. The code behind the OK button stores the SelectedValue property from the ListBox control, sets the DialogResult value, and closes the form: Private mProjectId As Guid Private Sub OK_Button_Click( _ ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles OK_Button.Click mProjectId = CType(Me.ProjectListListBox.SelectedValue, Guid) Me.Close() End Sub The value of SelectedValue needs to be stored so that it can be retrieved by the calling code. After all, the reason this ProjectSelect dialog was called in the first place was to allow the user to select that value! The OK button s DialogResult property is set to OK, indicating that the user clicked the OK button, and then the form is closed to return control to the code that called the dialog. The final bit of code is a read-only ProjectId property: Public ReadOnly Property ProjectId() As Guid Get Return mProjectId End Get End Property It is important to realize that closing a form doesn t destroy the object; it merely causes the form to no longer be displayed. This means that the code that created and displayed the ProjectSelect dialog still has a valid reference to the ProjectSelect dialog object, even after it has been closed. The calling code can then retrieve the selected ProjectId value, somewhat like this: Dim projectId As Guid Using dlg As New ProjectSelect If dlg.ShowDialog = DialogResult.OK Then projectId = dlg.ProjectId End If End Using With this small bit of effort, the ProjectSelect dialog is complete and can be used any time the user needs to select a project. The form is highly reusable, because ProjectSelect doesn t care what s done with the selected value; it simply allows the user to select a project.
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ProjectEdit
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The final item I ll cover in detail is the ProjectEdit user control. In some ways, this is like RolesEdit, because it inherits from WinPart and is hosted in MainForm. But the goal here is to show how a detail form can be created, along with using a DataGridView for editing child objects. Figure 9-14 shows the layout of the ProjectEdit user control.
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