Question

我是C＃和WPF架构的新手。我正在尝试使用简单的页面导航创建一个应用程序。我已将我的MainWindow从Window更改为NavigationWindow。我还将以下代码放在MainWindow.xaml.cs

中

 public void View(string newView) 
    {
        Uri view = new Uri(newView, UriKind.Relative);
        NavigationService nav = NavigationService.GetNavigationService(this);
        if (nav != null) 
        {   
            nav.Navigate(view);
        }
        else
        {
            MessageBox.Show("NavNull");
        }
    }

我从默认源（“HubView.xaml”）调用此方法，这是在名为“Pages”的文件夹中。代码看起来像这样

 public void Button_Click(object sender, RoutedEventArgs e)
    {
        View = @"\Pages\UserAdd.xaml";
        MainWindow mainWindow = new MainWindow();
        mainWindow.View(View);
     }

然而，当我单击按钮时，会显示消息框，指示nav等于null。我已经阅读了this问题和随后的答案，但我仍然不完全理解。

任何建议都将不胜感激！

编辑：

这是“MainWindow.xaml”：

<NavigationWindow x:Class="Container.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    ResizeMode="CanMinimize"
    Title="MainWindow" Height="350" Width="525" Source="Pages/HubView.xaml" WindowStyle="ThreeDBorderWindow" ShowsNavigationUI="False">
    </NavigationWindow>

如您所见，窗口是导航窗口。

Answer 1

NavigationService用于在WPF中进行页面导航，就像在浏览器中一样，要使用它，您需要在MainWindow.xaml中添加Frame

<Grid>
    <Frame x:Name="mainFrame"/>

    <Button x:Name="btnPage1" Content="Page 1" Width="200" Height="50"
            Click="btnPage1_Click"/>        
</Grid>

并使用NavigationService来导航，例如

private void btnPage1_Click(object sender, RoutedEventArgs e)
{
    mainFrame.NavigationService.Navigate(new Uri("Page1.xaml", UriKind.Relative));
}

修改创建1个窗口和2个页面

MainWindow.xaml

<NavigationWindow x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" Source="Page1.xaml">

的Page1.xaml

<Page x:Class="WpfApplication1.Page1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" Title="Page1"> <Grid> <TextBlock Text="Page 1" FontWeight="Bold" /> <Button Margin="0,40" Content="Goto Page 2" Width="200" Height="50" Click="Button_Click"/> </Grid>

Page1.xaml.cs

public partial class Page1 : Page { public Page1() { InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { this.NavigationService.Navigate(new Uri("Page2.xaml", UriKind.Relative)); } }

NavigationWindow的属性为NavigationService，因此无需创建新变量。希望有所帮助。注意 Page2.xaml只是一个空白页

WPF页面导航C＃无法正常工作

1 个答案: