访问wpf数据网格标头中的复选框

本文关键字:复选框 网格 wpf 数据 数据网 访问 | 更新日期: 2023-09-27 17:58:12

Hei,

我需要帮助弄清楚如何访问wpf数据网格头中的复选框。这是我的:

<DataGrid.Columns>
    <DataGridTemplateColumn CanUserReorder="False" CanUserResize="False">
        <DataGridTemplateColumn.HeaderTemplate>
            <DataTemplate>
                <CheckBox Name="cbxAll" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" />
            </DataTemplate>
        </DataGridTemplateColumn.HeaderTemplate>
        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <CheckBox IsChecked="{Binding Path=Checked, UpdateSourceTrigger=PropertyChanged}" IsEnabled="{Binding Path=NoErrors}" Name="theCheckbox" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" />
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</DataGrid.Columns>

我已经为复选框设置了Name,但由于某种原因,我无法从代码端访问它。

刷新数据网格项目后,我需要访问复选框以取消选中它。我该怎么做?

访问wpf数据网格标头中的复选框

MVVM中的一个工作示例:

ViewModel

public class MainWindowViewModel : INotifyPropertyChanged
{
    private bool allItemsAreChecked;
    public event PropertyChangedEventHandler PropertyChanged;
    public bool AllItemsAreChecked
    {
        get
        {
            return this.allItemsAreChecked;
        }
        set
        {
            this.allItemsAreChecked = value;
            var handler = this.PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs("AllItemsAreChecked"));
            }
        }
    }
}

XAML

<DataGridTemplateColumn CanUserReorder="False" CanUserResize="False">
    <DataGridTemplateColumn.HeaderTemplate>
        <DataTemplate>
            <CheckBox IsChecked="{Binding
                RelativeSource={RelativeSource AncestorType={x:Type DataGrid}},
                Path=DataContext.AllItemsAreChecked}" />
        </DataTemplate>
    </DataGridTemplateColumn.HeaderTemplate>
</DataGridTemplateColumn>

尽管绑定可能是您应该采用的方式,但您可以按要求执行。这里有一种方法:

1.给你的标题CheckBox一个Uid

<CheckBox Uid="CheckAll" />

2.命名您的DataGrid

<DataGrid Name="myDataGrid" />

3.实现以下扩展方法

public static UIElement FindUid(this DependencyObject parent, string uid)
{
    var count = VisualTreeHelper.GetChildrenCount(parent);
    if (count == 0) return null;
    for (int i = 0; i < count; i++)
    {
        var el = VisualTreeHelper.GetChild(parent, i) as UIElement;
        if (el == null) continue;
        if (el.Uid == uid) return el;
        el = el.FindUid(uid);
        if (el != null) return el;
    }
    return null;
}

4.访问并取消选中代码隐藏中的CheckBox,如此

CheckBox checkBox = myDataGrid.FindUid("CheckAll") as CheckBox;
checkBox.IsChecked = false;

设置一个简单事件:

<CheckBox x:Name="cbxAll" Click="cbxAll_Click"/>

在事件中点击代码:

private void cbxAll_Click(object sender, RoutedEventArgs e)
{
   var ckbox = sender as CheckBox;
   if (ckbox.IsChecked == true)
   {
    //Check all itens
   }
   else
   {
    //Uncheck all itens
   }
}

注意:发件人是复选框