c# code for select all checkbox in wpf datagrid

Question

I need some c# code to select / deselect all checkboxes in a datagrid in WPF 3.5 framework. I would like to do this by clicking a single header checkbox in the grid.

Please help.

Answer 1

This is based on someone else's source that I can't recall, but we use it to help find visual children of a type. It may not be the most efficient use for this scenario but it might help get you on the right track.

    public static childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
 {
  for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
  {
   DependencyObject child = VisualTreeHelper.GetChild(obj, i);
   if (child != null && child is childItem)
    return (childItem)child;

   childItem childOfChild = FindVisualChild<childItem>(child);
   if (childOfChild != null)
    return childOfChild;
  }
  return null;
 }

[Edit 4.16.09] Based on that, try out this method. Should find all CheckBoxes and change the state as provided, callable from your event handler on the Checked/Unchecked events.

   public static void CheckAllBoxes(DependencyObject obj, bool isChecked)
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
        {
            // If a checkbox, change IsChecked and continue.
            if (obj is CheckBox)
            {
                ((CheckBox) obj).IsChecked = isChecked;
                continue;
            }

            DependencyObject child = VisualTreeHelper.GetChild(obj, i);
            CheckAllBoxes(child, isChecked);
        }
    }

Answer 2

I would use the new databinding features in WPF. Give all of the checkboxes a one-way binding on their IsChecked property with the binding source being the master checkbox's IsChecked property.

Another option would be to use triggers

Answer 3

Hi,

I want code for select all checkbox in datagrid in C# winforms.

Hope you can help me..

Regards, Shyam

Answer 4

This can be done declaratively. The following creates a checkbox column for each row and which can toggle row selections. The header of the checkbox column can be clicked to do a select all of the rows.

Relevant portions from the xaml

<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"&gt;
    <toolkit:DataGrid Name="dataGrid" 
     ItemsSource="{Binding}" AutoGenerateColumns="True" 
     SelectionMode="Extended" CanResizeRows="False">
    <toolkit:DataGrid.RowHeaderTemplate>
       <DataTemplate>
           <Grid>
               <CheckBox IsChecked="{
                  Binding Path=IsSelected, 
                  Mode=TwoWay, 
                  RelativeSource={RelativeSource FindAncestor, 
                  AncestorType={x:Type toolkit:DataGridRow}}}"
            />
           </Grid>
       </DataTemplate>
    </toolkit:DataGrid.RowHeaderTemplate>
    </toolkit:DataGrid>
</Window>

Answer 5

DataColumn dt = null;            
        for (int i = 0; i < dataGrid.Columns.Count; i++)
        {

     dt = new DataColumn("Column Name");

            dt.DataType = typeof(Boolean);
            dt.DefaultValue = false;
             dataTable.Add(dt);
        }

dataGied.DataContext = dataTable;



<Custom:DataGrid x:Name="dataGrid" AutoGenerateColumns="True" ItemsSource="{Binding}" />

Well it is just a rough Idea, hope this works

Answer 6

Hi, I have the checkbox in the RowHeader. How can I get the checkbox isChecked value by loop through the records in the datagrid?