Question

嗨我有wpf应用程序，其中我有一个数据网格，标题中有3个复选框。

当选中任何标题复选框时，我希望检查该特定部分中的所有正文复选框。

问题是当我检查标题时，只检查视图中可见的复选框。当我使用滚动条向下滚动时，向下移动scollbar时可见的不可见复选框，将取消选中这些复选框。有谁可以帮忙。谢谢。这是代码。

public IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
        {
            if (depObj != null)
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    var child = VisualTreeHelper.GetChild(depObj, i);
                    // If there is a child found and if the child is of the T type. 
                    //Dont remove null check . If no check i
                    if (child != null && child is T)
                    {
                        yield return (T)child;
                    }
                    foreach (T childOfChild in FindVisualChildren<T>(child))
                    {
                        yield return childOfChild;
                    }
                }
            }
        }
private void ChkHeaderExtract_OnChecked(object sender, RoutedEventArgs e)
        {
            var extractCheckBoxes = GetAllCheckBoxs();
            var i = 0;
            foreach (var chk in extractCheckBoxes)
            {
                if (i % 3 == 0)
                {
                    chk.IsChecked = true;
                }
                i++;
            }

        }

XAML：

 <DataGrid x:Name="DgEntities" FrozenColumnCount="13" IsReadOnly="True" MaxWidth="854" Height="444" CanUserAddRows="false" ItemsSource="{Binding JobEntitiesCollectionViewSource.View, Mode=OneWay, NotifyOnTargetUpdated=True}" AutoGenerateColumns="False" SelectionMode="Single" SelectionUnit="FullRow" HorizontalScrollBarVisibility="Disabled" Margin="21,-49,106,5" Width="763">
                <DataGrid.Columns>
                    <DataGridTextColumn Binding="{Binding Name}" Header="Entity" Width="220" MinWidth="172" MaxWidth="215"/>
                    <DataGridTemplateColumn Header="Status" Width="138" MaxWidth="138" MinWidth="138">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Button Margin="5" Content="{Binding ExtractStatus, Mode=TwoWay, NotifyOnTargetUpdated=True}" Command="{Binding DataContext.HyperlinkCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" CommandParameter="{Binding SelectedItem, ElementName=DgEntities}" Foreground="Blue" Cursor="Hand" MouseDoubleClick="Control_OnMouseDoubleClick" >
                                    <Button.Template>
                                        <ControlTemplate TargetType="{x:Type Button}">
                                            <TextBlock TextDecorations="Underline"><InlineUIContainer>
                                                    <ContentPresenter />
                                                </InlineUIContainer></TextBlock>
                                        </ControlTemplate>
                                    </Button.Template>
                                </Button>
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>

                    <DataGridTemplateColumn Width="40" MaxWidth="40" MinWidth="40">
                        <DataGridTemplateColumn.Header>
                            <CheckBox x:Name="ChkHeaderExtract" Checked="ChkHeaderExtract_OnChecked" Unchecked="ChkHeaderExtract_OnUnchecked"/>
                        </DataGridTemplateColumn.Header>

                        <DataGridTemplateColumn.CellTemplate>

                            <DataTemplate>

                                <CheckBox HorizontalAlignment="Center" Unchecked="ChkExtract_OnUnchecked" VerticalAlignment="Center" x:Name="chkExtract" IsChecked="{Binding ExtractIsSelected, Mode=TwoWay, NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged}" />

                            </DataTemplate>

                        </DataGridTemplateColumn.CellTemplate>

                    </DataGridTemplateColumn>

                    <DataGridTemplateColumn Header="Status" Width="128" MaxWidth="128" MinWidth="128">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Button Margin="5" Content="{Binding TransformStatus, Mode=TwoWay, NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged}" Command="{Binding DataContext.HyperlinkCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" CommandParameter="{Binding SelectedItem, ElementName=DgEntities}" Cursor="Hand" Foreground="Blue" MouseDoubleClick="Control_OnMouseDoubleClick_2" >
                                    <Button.Template>
                                        <ControlTemplate TargetType="{x:Type Button}">
                                            <TextBlock TextDecorations="Underline"><InlineUIContainer>
                                                    <ContentPresenter />
                                                </InlineUIContainer></TextBlock>
                                        </ControlTemplate>
                                    </Button.Template>
                                </Button>

                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>

                    <DataGridTemplateColumn Width="40" MaxWidth="40" MinWidth="40">
                        <DataGridTemplateColumn.Header>
                            <CheckBox x:Name="ChkHeaderTransform" Checked="ChkHeaderTransform_OnChecked" Unchecked="ChkHeaderTransform_OnUnchecked"/>
                        </DataGridTemplateColumn.Header>
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>

                                <CheckBox HorizontalAlignment="Center" Unchecked="ChkTransform_OnUnchecked" VerticalAlignment="Center" x:Name="chkTransform" IsChecked="{Binding TransformIsSelected, Mode=TwoWay, NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged}"/>

                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>

                    <DataGridTemplateColumn Header="Status" Width="137.5" MaxWidth="137.5" MinWidth="137.5">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Button Margin="5" Content="{Binding LoadStatus, Mode=TwoWay, NotifyOnTargetUpdated=True}" Command="{Binding DataContext.HyperlinkCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" CommandParameter="{Binding SelectedItem, ElementName=DgEntities}" Cursor="Hand" Foreground="Blue" MouseDoubleClick="Control_OnMouseDoubleClick" >
                                    <Button.Template>
                                        <ControlTemplate TargetType="{x:Type Button}">
                                            <TextBlock TextDecorations="Underline"><InlineUIContainer>
                                                    <ContentPresenter />
                                                </InlineUIContainer></TextBlock>
                                        </ControlTemplate>
                                    </Button.Template>

                                </Button>

                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                    <DataGridTemplateColumn Width="56" MaxWidth="56" MinWidth="56">
                        <DataGridTemplateColumn.Header>
                            <CheckBox x:Name="ChkHeaderLoad" HorizontalAlignment="Center" Margin="0.3" Checked="ChkHeaderLoad_OnChecked" Unchecked="ChkHeaderLoad_OnUnchecked" />
                        </DataGridTemplateColumn.Header>
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <CheckBox Margin="8" x:Name="chkLoad" Checked="ChkLoad_OnChecked" Unchecked="ChkLoad_OnUnchecked" IsChecked="{Binding LoadIsSelected, Mode=TwoWay, NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged}"/>
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>

Answer 1

这只会返回已加载的孩子..

VisualTreeHelper.GetChildrenCount(depObj)

你应该更新实际的绑定对象，然后真正刷新itemssource。

检查标题时如何检查正文中的所有复选框

1 个答案: