通過菜單項單擊WPF更改窗口的內容

Question

我必須做一個WPF應用程序，它需要包含菜單欄。 當用戶單擊每個菜單項時，窗口應加載不同的內容。 請任何人提出任何想法以實現這一目標。

<Window  x:Class="win3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
        Title="MainWindow" Height="700" Width="600" >
    <Grid>

        <DockPanel>
            <Menu DockPanel.Dock="Top">
                <MenuItem Header="Student" Click="StudentMenuItem_Click"/>
                <MenuItem Header="Academic" Click="AcademicMenuItem_Click"/>
            </Menu>
            <TextBox AcceptsReturn="True" />
        </DockPanel>
        <Grid x:Name="grdStudent"  Height="500" Width="550" Margin="22,56,22,115">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="2*"/>
                <ColumnDefinition Width="3*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="6*"/>
                <RowDefinition Height="1*"/>
            </Grid.RowDefinitions>
            <Label Content="Student Id" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="57,51,0,0"/>
            <Label Content="Student Name: " HorizontalAlignment="Left" Margin="57,110,0,0" VerticalAlignment="Top" Width="84"/>
            <TextBox Grid.Column="1" HorizontalAlignment="Left" Height="23" Margin="46,51,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="175"/>
            <TextBox Grid.Column="1" HorizontalAlignment="Left" Height="23" Margin="46,110,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="175"/>
        </Grid>

        <Grid x:Name="grdAcademic" Height="500" Width="550" Margin="22,56,22,115" >
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="2*"/>
                <ColumnDefinition Width="3*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="1*"/>
                <RowDefinition Height="5*"/>
            </Grid.RowDefinitions>
            <ComboBox x:Name="cmbFloor" HorizontalAlignment="Left" VerticalAlignment="Top" Width="80" SelectionChanged="cmbFloor_SelectionChanged" Margin="130,29,0,0"/>
            <ComboBox x:Name="cmbDoor" HorizontalAlignment="Left" Margin="130,10,0,0" VerticalAlignment="Top" Width="80" SelectionChanged="cmbDoor_SelectionChanged" Grid.Row="1"/>
        </Grid>
    </Grid>
</Window >

.cs文件

  private void StudentMenuItem_Click(object sender, RoutedEventArgs e)
        {
            this.grdStudent.Visibility = Visibility.Visible;
            this.grdAcademic.Visibility = Visibility.Collapsed;
        }

      private void AcademicMenuItem_Click(object sender, RoutedEventArgs e)
        {
            this.grdAcademic.Visibility = Visibility.Collapsed;
            this.grdStudent.Visibility = Visibility.Collapsed;
        }

上面的代碼按預期工作，但.XMAL文件顯得笨拙（稍后我們需要添加更多控制器）

Answer 1

您可以將不同的內容放在單獨的文件中，例如：

StudentView.xaml

<UserControl
    <!-- Standard UC code here -->
    >
    <Grid x:Name="grdStudent"  Height="500" Width="550" Margin="22,56,22,115">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="2*"/>
            <ColumnDefinition Width="3*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="6*"/>
            <RowDefinition Height="1*"/>
        </Grid.RowDefinitions>
        <Label Content="Student Id" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="57,51,0,0"/>
        <Label Content="Student Name: " HorizontalAlignment="Left" Margin="57,110,0,0" VerticalAlignment="Top" Width="84"/>
        <TextBox Grid.Column="1" HorizontalAlignment="Left" Height="23" Margin="46,51,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="175"/>
        <TextBox Grid.Column="1" HorizontalAlignment="Left" Height="23" Margin="46,110,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="175"/>
    </Grid>
</UserControl>

然后將MainWindow.xaml更改為

<Grid>
    <DockPanel>
        <!-- Put your menu code here -->
    </DockPanel>
    <ContentControl x:Name="content" />
</Grid>

並在您的代碼后面

private readonly FrameworkElement _academicView;
private readonly FrameworkElement _studentView;

public MainWindow()
{
    InitializeComponent();

    _academicView = new AcademicView();
    _studentView = new StudentView();

    content.Content = _academicView; // set the default view
}

private void StudentMenuItem_Click(object sender, RoutedEventArgs e)
{
    content.Content = _studentView;
}

private void AcademicMenuItem_Click(object sender, RoutedEventArgs e)
{
    content.Content = _academicView;
}

除此之外，我建議您研究MVVM模式。

Answer 2

您可以使用DataTemplate和ContentControl。 在2個用戶控件中定義視圖“ grdAcademic”和“ grdStudent”，並為其定義數據模板。

<DataTemplate x:Key="grdAcademicView">
    <local:UserControlGrdAcademic />
</DataTemplate>

<DataTemplate x:Key="grdStudentView" >
    <local:UserControlGrdStudent />
</DataTemplate>

假設，這里的“本地”是您的clr命名空間（xmlns：local =“ clr-namespace：”）

菜單按鈕單擊可以與視圖模型中的2個變量關聯，例如“ IsStudent”和“ IsAcademic”，並按如下方式使用它們：

<ContentControl Content="{Binding }">
    <ContentControl.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=IsStudent}" Value="True">
                    <Setter Property="ContentControl.ContentTemplate" Value="{StaticResource grdStudentView}" />
                </DataTrigger>
                <DataTrigger Binding="{Binding Path=IsAcademic}" Value="True">
                    <Setter Property="ContentControl.ContentTemplate" Value="{StaticResource grdAcademicView}" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ContentControl.Style>
</ContentControl>