在带有多个选择列表框的DataTemplate中查找控件 [英] Find Control in DataTemplate with a multi selection listbox

问题描述

我有一个多选列表框，用户可以在其中勾选列表中的多个项目.目前我有它因此，当一个复选框被打勾ListBoxItem中它也是被选中内:

I have a multi selection listbox where a user can tick multiple items in the list. At the moment I have it so when a checkbox is ticked the ListBoxItem it is within also gets selected:

private void CheckBox_Checked(object sender, RoutedEventArgs e)
            {
                //Select the Item using the DataContext of the Button
                object clicked = (e.OriginalSource as FrameworkElement).DataContext;
                var lbi = LstDistro.ItemContainerGenerator.ContainerFromItem(clicked) as ListBoxItem;
                lbi.IsSelected = true;
            }

现在，我正尝试以其他方式进行操作.只要选择了一个ListBoxItem中的复选框被选中.到目前为止，我已经选中了您选择的第一个项目，但是此后您选择的其他所有项目都没有被打勾.我需要以某种方式让它遍历所有当前选定的项目.

Now I am trying to do it the other way. Whenever a ListBoxItem is selected the checkbox within it gets ticked. So far I have it so the first item you select will get ticked but after that none of the other items you select get ticked. I need to somehow have it loop through all the current selected items.

我当前的代码:

WPF:

<ListBox x:Name="LstDistro" HorizontalAlignment="Left" Margin="10,10,0,42" Width="235" BorderBrush="Black" BorderThickness="2,2,1,1" SelectionMode="Multiple" SelectionChanged="LstDistro_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid>
                        <Canvas x:Name="EventItem" HorizontalAlignment="Left" Height="42" VerticalAlignment="Top" Width="215" Background="{Binding Path=LBackground}">
                            <Label Content="{Binding LInits}" HorizontalAlignment="Left" Height="33" VerticalAlignment="Top" Width="40" FontWeight="Bold" FontSize="12" Canvas.Top="5"/>
                            <Label Content="{Binding LFullName}" HorizontalAlignment="Left" Height="33" VerticalAlignment="Top" Width="164" FontSize="12" Canvas.Left="40" Canvas.Top="5"/>
                            <CheckBox x:Name="ChkName" Height="20" Width="20" Canvas.Left="190" Canvas.Top="12" Checked="CheckBox_Checked"  IsChecked="False"/>
                        </Canvas>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

C#:

private void CheckBox_Checked(object sender, RoutedEventArgs e)
            {
                //Select the Item using the DataContext of the Button
                object clicked = (e.OriginalSource as FrameworkElement).DataContext;
                var lbi = LstDistro.ItemContainerGenerator.ContainerFromItem(clicked) as ListBoxItem;
                lbi.IsSelected = true;
            }

            private void LstDistro_SelectionChanged(object sender, SelectionChangedEventArgs e)
            {

                //Get the current selected item
                ListBoxItem item = LstDistro.ItemContainerGenerator.ContainerFromIndex(LstDistro.SelectedIndex) as ListBoxItem;
                CheckBox ChkName = null;

                //Get the item's template parent
                ContentPresenter templateParent = GetFrameworkElementByName<ContentPresenter>(item);
                //Get the DataTemplate that the Checkbox is in.
                DataTemplate dataTemplate = LstDistro.ItemTemplate;
                ChkName = dataTemplate.FindName("ChkName", templateParent) as CheckBox;
                ChkName.IsChecked = true;
            }

            private static T GetFrameworkElementByName<T>(FrameworkElement referenceElement) where T : FrameworkElement
            {
                FrameworkElement child = null;
                for (Int32 i = 0; i < VisualTreeHelper.GetChildrenCount(referenceElement); i++)
                {
                    child = VisualTreeHelper.GetChild(referenceElement, i) as FrameworkElement;
                    System.Diagnostics.Debug.WriteLine(child);
                    if (child != null && child.GetType() == typeof(T))
                    { break; }
                    else if (child != null)
                    {
                        child = GetFrameworkElementByName<T>(child);
                        if (child != null && child.GetType() == typeof(T))
                        {
                            break;
                        }
                    }
                }
                return child as T;
            }

推荐答案

您应像这样设置Checkbox IsChecked绑定:

You should set the Checkbox IsChecked binding like this:

IsChecked="{Binding Path=IsSelected, RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}}"

这意味着每当您选择ListBoxItem时，您的复选框也会被选中.

This means whenever you select a ListBoxItem your checkbox will also become checked.

希望这会有所帮助:)

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