在ContentControl中的两个控件之间切换

问题描述

您好，目前，我正在尝试构建一个具有ContentControl的应用程序，该控件可在派生的DataGrid和ListBox之间切换，以提供有关Data的两个不同视图:

Hello, currently I am trying to build an application which has a ContentControl which switches between a derived DataGrid and a ListBox to provide two different views on Data:

<ContentControl Content="{Binding ElevationsView}" x:Name="ElevationsContentControl">
            <ContentControl.Resources>
                <DataTemplate x:Key="ElevationsDetailedList">
                    <local:ExtendedDataGrid ItemsSource="{Binding}" ScrollViewer.ScrollChanged="ElevationsDetailedList_ScrollChanged" AutoGenerateColumns="True" />
                </DataTemplate>
                <DataTemplate x:Key="ElevationsTileView">
                    <ListBox ItemsSource="{Binding}" ScrollViewer.ScrollChanged="ListBox_ScrollChanged" />
                </DataTemplate>
            </ContentControl.Resources>
            <ContentControl.Style>
                <Style TargetType="{x:Type ContentControl}">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ViewMode}" Value="{x:Static local:ViewMode.DetailedList}">
                            <Setter Property="ContentTemplate" Value="{StaticResource ElevationsDetailedList}" />
                        </DataTrigger>
                    </Style.Triggers>
                    <Setter Property="ContentTemplate" Value="{StaticResource ElevationsTileView}" />
                </Style>
            </ContentControl.Style>
        </ContentControl>

ExtendedDataGrid目前仅是DataGrid的派生类，没有任何其他功能.但是，如果我启动应用程序，并且初始ViewMode为"DetailedList"，则会收到错误"Type of ExtendedDataGrid"的对象. 无法转换为类型"System.Windows.Controls.ListBox".

The ExtendedDataGrid is at the moment only a derived class from DataGrid without any additional functionality. But if I start the application and the initial ViewMode is "DetailedList", I get the error "An object of Type "ExtendedDataGrid" cannot be converted into the type "System.Windows.Controls.ListBox".

如果我从ExtendedDataGrid或ListView中删除ScrollChanged事件，或者当我将ExtendedDataGrid更改为DataGrid时，它将起作用.但是对于我来说，这都不是可接受的解决方案，因为我需要ExtendedDataGrid和ScrollChanged事件.

It works, if I delete the ScrollChanged Event from either the ExtendedDataGrid or the ListView, or when I change the ExtendedDataGrid to DataGrid. But both aren't acceptable solutions for me, as I need the ExtendedDataGrid and the ScrollChanged event.

有人知道原因吗，或者可以给我解决方法?

Does somebody knows the cause of this or can give me a workaround?

推荐答案

            <ContentControl.Resources>
                <DataTemplate x:Key="ElevationsDetailedList">
                    <local:ExtendedDataGrid ItemsSource="{Binding}" Loaded="ExtendedDataGrid_Loaded"  AutoGenerateColumns="True" />
                </DataTemplate>
                <DataTemplate x:Key="ElevationsTileView">
                    <ListBox ItemsSource="{Binding}" Loaded="ListBox_Loaded" />
                </DataTemplate>
            </ContentControl.Resources>

        private void ListBox_Loaded(object sender, RoutedEventArgs e)
        {
            ListBox listBox = sender as ListBox;
            listBox.AddHandler(ScrollViewer.ScrollChangedEvent, new RoutedEventHandler(ListBox_ScrollChanged));
        }

        private void ExtendedDataGrid_Loaded(object sender, RoutedEventArgs e)
        {
            ExtendedDataGrid grid = sender as ExtendedDataGrid;
            grid.AddHandler(ScrollViewer.ScrollChangedEvent, new RoutedEventHandler(ExtendedDataGrid_Loaded));
        }

这应该满足XAML解析器:)

希望有帮助.

This should satisfy the XAML parser :)

Hope that helps.

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