WPF--窗口之間的值傳遞

WPF中，如何使窗口與窗口之間進行值的傳遞呢？

如果窗口A要傳遞一個值給窗口B。那麼就在窗口A上，賦值給窗口B的屬性上。

實例如下：

主窗口MainWindow.xaml

    <Grid>
        <TextBlock HorizontalAlignment="Left" Margin="139,67,0,0" TextWrapping="Wrap" Text="用戶名" VerticalAlignment="Top"/>
        <TextBox Name="txtUserName" HorizontalAlignment="Left" Height="23" Margin="252,64,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="120"/>
        <TextBlock HorizontalAlignment="Left" Margin="139,134,0,0" TextWrapping="Wrap" Text="密  碼" VerticalAlignment="Top" Height="17"/>
        <PasswordBox Name="pwdPassword" HorizontalAlignment="Left" Margin="252,134,0,0" VerticalAlignment="Top" Width="120"/>
        <Button Name="btnLogin" Content="登  錄" HorizontalAlignment="Left" Margin="231,222,0,0" VerticalAlignment="Top" Width="75" Click="btnLogin_Click"/>


    </Grid>

主窗口的後臺代碼（其實就是一個Button事件）

 private void btnLogin_Click(object sender, RoutedEventArgs e)
        {
            if (txtUserName.Text.Length <= 0 || pwdPassword.Password.Length <= 0)
            {
                Button btn = (Button) sender;
                btn.Content = "內容不能爲空";
            }
            if (txtUserName.Text != "admin" && pwdPassword.Password != "123456")
            {
                MessageBox.Show("用戶名或者密碼錯誤");
                return;
            }
            else
            {
                Index index=new Index();
                index.Username = txtUserName.Text;
                index.ShowDialog();
            }

        }

傳遞值的窗口index

前臺代碼（一個Label）

<span style="white-space:pre">	</span><Label Name="labName" Content="Label" HorizontalAlignment="Left" Margin="44.724,50,0,0" VerticalAlignment="Top"/>

後臺代碼

        public string Username { get; set; }

        public Index()
        {
            InitializeComponent();
        }

        private void Window_Loaded_1(object sender, RoutedEventArgs e)
        {
            labName.Content = "歡迎你"+Username+"先生";         
        }

解析：

MainWindow的用戶名，是通過Index的屬性（Username）來，存儲傳遞過來的值。