[英]WPF page navigation in c#
我正在嘗試學習C#和WPF應用程序。 在這里,我試圖在按鈕單擊事件上從一個WPF頁面(MainWindow.xaml)重定向到另一個(HandWash.xaml)。 但是下面的代碼拋出NULLReferenceException。 這是MainWindow.xaml文件。
<Window x:Class="MyApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
d:DesignHeight="720" d:DesignWidth="1284"
Title="StartPage" WindowStartupLocation="CenterScreen" WindowStyle="None" WindowState="Maximized" Closed="Window_Closed">
<Window.Background>
<ImageBrush ImageSource="/Images/StartPage.png"></ImageBrush>
</Window.Background>
<Grid>
<Button Content="Hand Wash" Height="794" HorizontalAlignment="Left" Name="HandWash" VerticalAlignment="Top" Width="353" FontSize="50" Background="Transparent" BorderThickness="0" Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" Click="HandWash_Click"/>
<Button Content="Bathing" Height="794" HorizontalAlignment="Left" Margin="390,0,0,0" Name="Bathing" VerticalAlignment="Top" Width="301" FontSize="50" Background="Transparent" BorderThickness="0" Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" Click="Bathing_Click"/>
<Button Content="Nail-Clip" Height="794" HorizontalAlignment="Left" Margin="730,0,0,0" Name="NailClip" VerticalAlignment="Top" Width="295" FontSize="50" Background="Transparent" BorderThickness="0" Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" Click="NailClip_Click"/>
<Button Content="Teeth Brush" Height="794" HorizontalAlignment="Left" Margin="1067,0,0,0" Name="TeethBrush" VerticalAlignment="Top" Width="310" FontSize="50" Background="Transparent" BorderThickness="0" Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" Click="TeethBrush_Click"/>
</Grid>
</Window>
后台代碼:
private void TeethBrush_Click(object sender, RoutedEventArgs e)
{
try
{
TeethBrush teeth = new TeethBrush(myarg);
NavigationService navService = NavigationService.GetNavigationService(this);
navService.Navigate(teeth); // NULL REFERENCE EXCEPTION at this line
}
catch (NullReferenceException ex)
{
System.Windows.MessageBox.Show(ex.Message);
}
}
這是TeethBrush.xaml的代碼:
<Page x:Class="MyApplication.TeethBrush"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
d:DesignHeight="720" d:DesignWidth="1284"
Title="TeethBrush">
<Grid>
</Grid>
<Page.Background>
<ImageBrush ImageSource="C:\Users\Tonmoy\Documents\Visual Studio 2010\Projects\MyKinectApp\MyKinectApp\Images\StartPage.png"></ImageBrush>
</Page.Background>
</Page>
后台代碼是:
public TeethBrush(Myargs arg)
{
InitializeComponent();
//Rest of the code
}
請幫忙....
您需要在主窗口中有一個框架,在該框架中將托管頁面的內容。 如果將以下名稱空間添加到MainWindow:
xmlns:local="clr-namespace:System.Windows.Controls;assembly=PresentationFramework"
您可以在某處定義框架,例如在網格中:
<Grid>
<local:Frame x:Name="mainFrame">
</local:Frame>
....
然后,您可以從事件處理程序進行導航,如下所示:
TeethBrush teeth = new TeethBrush(myarg);
this.mainFrame.Navigate(teeth);
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