9.ContactDetailPage2功能页的代码非常直观。再次强调要把类型参数改为Object。
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace AddressBook
{
/// <summary>
/// Interaction logic for ContactDetailPage2.xaml
/// </summary>
public partial class ContactDetailPage2 : PageFunction<Object>
{
public ContactDetailPage2()
{
InitializeComponent();
}
/// <summary>
/// Create a ContactDetailPage2 with specified edit mode value.
/// Since we won’t be displaying this page on the right hand side
/// Frame, this constructor does not accept and use the index
/// of selected element in the ContactList.
/// </summary>
public ContactDetailPage2(bool editmode)
{
InitializeComponent();
if (editmode == false)
{
ContactList cl =
Application.Current.Properties["ContactList"]
as ContactList;
Contact c = cl[0];
this.RootGrid.DataContext = c;
this.RootGrid.IsEnabled = false;
this.ButtonPanel1.Visibility = Visibility.Hidden;
this.ButtonPanel2.Visibility = Visibility.Hidden;
}
}
//
// Navigate back if the Back button is clicked
//
private void OnBackClick(object sender, RoutedEventArgs e)
{
NavigationService ns =
NavigationService.GetNavigationService(this);
ns.GoBack();
}
//
// Close window if Cancel button is clicked
//
private void OnCancelClick(object sender, RoutedEventArgs e)
{
((NavigationWindow)(this.Parent)).Close();
}
//
// When the Finish button is clicked, hydrate the Contact
// object with page data and return to our caller, which is
// ContactDetailPage1 page function.
//
private void OnFinishClick(object sender, RoutedEventArgs e)
{
Contact c = new Contact();
c.HomeAddress = this.txtHomeAddress.Text;
c.BusinessAddress = this.txtBusinessAddress.Text;
OnReturn(new ReturnEventArgs<object>(c));
// close the wizard
Window w = Application.Current.Properties["AddContactWizard"]
as Window;
w.Close();
}
}
}
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace AddressBook
{
/// <summary>
/// Interaction logic for ContactDetailPage2.xaml
/// </summary>
public partial class ContactDetailPage2 : PageFunction<Object>
{
public ContactDetailPage2()
{
InitializeComponent();
}
/// <summary>
/// Create a ContactDetailPage2 with specified edit mode value.
/// Since we won’t be displaying this page on the right hand side
/// Frame, this constructor does not accept and use the index
/// of selected element in the ContactList.
/// </summary>
public ContactDetailPage2(bool editmode)
{
InitializeComponent();
if (editmode == false)
{
ContactList cl =
Application.Current.Properties["ContactList"]
as ContactList;
Contact c = cl[0];
this.RootGrid.DataContext = c;
this.RootGrid.IsEnabled = false;
this.ButtonPanel1.Visibility = Visibility.Hidden;
this.ButtonPanel2.Visibility = Visibility.Hidden;
}
}
//
// Navigate back if the Back button is clicked
//
private void OnBackClick(object sender, RoutedEventArgs e)
{
NavigationService ns =
NavigationService.GetNavigationService(this);
ns.GoBack();
}
//
// Close window if Cancel button is clicked
//
private void OnCancelClick(object sender, RoutedEventArgs e)
{
((NavigationWindow)(this.Parent)).Close();
}
//
// When the Finish button is clicked, hydrate the Contact
// object with page data and return to our caller, which is
// ContactDetailPage1 page function.
//
private void OnFinishClick(object sender, RoutedEventArgs e)
{
Contact c = new Contact();
c.HomeAddress = this.txtHomeAddress.Text;
c.BusinessAddress = this.txtBusinessAddress.Text;
OnReturn(new ReturnEventArgs<object>(c));
// close the wizard
Window w = Application.Current.Properties["AddContactWizard"]
as Window;
w.Close();
}
}
}
10.到此为止第二个功能页面就完全定义好了。我们把它们和第一个页面上的返回事件处理函数和Next按钮click处理函数绑定到一起。在第一个页面的代码文件ContactDetailPage1.xaml.cs里添加如下代码：
//
// On clicking the next button on PF1, navigate to PF2
//
private void OnNextClick(object sender, RoutedEventArgs e)
{
NavigationService ns =
NavigationService.GetNavigationService(this);
ContactDetailPage2 pageFunction = new ContactDetailPage2();
pageFunction.Return += new
ReturnEventHandler<Object>(pageFunction2_Return);
ns.Navigate(pageFunction);
}
//
// When the second PF returns, get the Contact object it
// sent back and add the first PF’s data to it
// Then return to the UILessPageFunction that called this
// ContactDetailPage1 PF.
//
void pageFunction2_Return(object sender, ReturnEventArgs<object> e)
{
Contact c = e.Result as Contact;
c.FirstName = this.txtFirstName.Text;
c.LastName = this.txtLastName.Text;
c.HomePage = new Uri(this.txtHomePage.Text);
c.EmailAddress = this.txtEmailAddress.Text;
OnReturn(new ReturnEventArgs<object>(c));
}
// On clicking the next button on PF1, navigate to PF2
//
private void OnNextClick(object sender, RoutedEventArgs e)
{
NavigationService ns =
NavigationService.GetNavigationService(this);
ContactDetailPage2 pageFunction = new ContactDetailPage2();
pageFunction.Return += new
ReturnEventHandler<Object>(pageFunction2_Return);
ns.Navigate(pageFunction);
}
//
// When the second PF returns, get the Contact object it
// sent back and add the first PF’s data to it
// Then return to the UILessPageFunction that called this
// ContactDetailPage1 PF.
//
void pageFunction2_Return(object sender, ReturnEventArgs<object> e)
{
Contact c = e.Result as Contact;
c.FirstName = this.txtFirstName.Text;
c.LastName = this.txtLastName.Text;
c.HomePage = new Uri(this.txtHomePage.Text);
c.EmailAddress = this.txtEmailAddress.Text;
OnReturn(new ReturnEventArgs<object>(c));
}
11.当联系人列表当中的某一项被选定的时候，我们要把联系人详细信息显示在右边的面板。下面我么就来写这一段代码。我们不是曾经在MainWindow.xaml.cs里面创建了一个空的ListItemSelected方法吗？现在我们把它实现吧：
//
// Triggered when an item in the Contacts list is selected
//
void ListItemSelected(object sender, SelectionChangedEventArgs args)
{
// show first page function on the right hand side frame
ContactDetailPage1 pageFunction =
new ContactDetailPage1(false, allContacts.SelectedIndex);
pageFunction.Return += new
System.Windows.Navigation.ReturnEventHandler<object>
(pageFunction0_Return);
this.Frame_RightPane.Navigate(pageFunction);
//update status bar
ContactList cl =
Application.Current.Properties["ContactList"]
as ContactList;
Contact c = cl[allContacts.SelectedIndex];
this.tb.Text = c.FirstName + " " + c.LastName;
}
// Triggered when an item in the Contacts list is selected
//
void ListItemSelected(object sender, SelectionChangedEventArgs args)
{
// show first page function on the right hand side frame
ContactDetailPage1 pageFunction =
new ContactDetailPage1(false, allContacts.SelectedIndex);
pageFunction.Return += new
System.Windows.Navigation.ReturnEventHandler<object>
(pageFunction0_Return);
this.Frame_RightPane.Navigate(pageFunction);
//update status bar
ContactList cl =
Application.Current.Properties["ContactList"]
as ContactList;
Contact c = cl[allContacts.SelectedIndex];
this.tb.Text = c.FirstName + " " + c.LastName;
}
因为ContactDetailPage1对话框是以只读模式显示的，它不应该返回任何值。我们就在MainWindow.xaml.cs里创建一个空的pageFunction0_Return，好让程序能顺利编译。
