access control in datagirdheaderstyle

Question

hi all

i wrote an datagridheader style

<Grid Height="430" HorizontalAlignment="Left" Margin="14,10,0,0" Name="gridDataGrid" VerticalAlignment="Top" Width="489" Visibility="Hidden" Grid.ColumnSpan="4">
            <DataGrid AutoGenerateColumns="True" Name="dataGridBook" ItemsSource="{Binding}" >
                <DataGrid.ColumnHeaderStyle>
                    <Style TargetType="{x:Type DataGridColumnHeader}">
                        <Style.Setters>
                        <Setter Property="Template">
                            <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
                                        <Grid>
                                            <Grid.ColumnDefinitions>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                                <ColumnDefinition Width="*"></ColumnDefinition>
                                                <ColumnDefinition Width="*"></ColumnDefinition>
                                            </Grid.ColumnDefinitions>
                                            <Button Content="{TemplateBinding Content}" Grid.Column="0" Click="GridHeaderButton_Click"></Button>
                                            <TextBox x:Name="txt1" Grid.Column="2" Text="{TemplateBinding Content}"></TextBox>
                                            <TextBlock Grid.Column="1" Text="{TemplateBinding Content}"></TextBlock>
                                        </Grid>
                                    </ControlTemplate>
                                </Setter.Value>
                        </Setter>
                        </Style.Setters>
                    </Style>
                </DataGrid.ColumnHeaderStyle>
            </DataGrid>
        </Grid>

i want access txt1 in my code.

i try alot but dont access that.

any one can help?

thankful.

Answer 1

Hi rastinrastini,

You can go through below link

http://msdn.microsoft.com/en-us/library/bb613586.aspx

http://stackoverflow.com/questions/820201/how-to-access-a-wpf-control-located-in-a-controltemplate

or here is the sample code in which i am accessing control which is inside the ControlTemplate from code behind

You can create an application with name "WpfApplication28" and copy/paste below code

XAML

<Window x:Class="WpfApplication28.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <ControlTemplate x:Key="MyTemplate" TargetType="{x:Type Button}">
            <Border x:Name="border" Background="Aqua">
                <ContentPresenter  VerticalAlignment="Center"
                                   HorizontalAlignment="Center"/>
            </Border>
        </ControlTemplate>
    </Window.Resources>
    <Grid>
        <Button Content="Hello world" x:Name="myButton" Template="{StaticResource MyTemplate}" 
                VerticalAlignment="Top"/>
        <Button Content="Click" VerticalAlignment="Bottom" Click="Button_Click"/>
    </Grid>
</Window>

.cs

          

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication28
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Border b = (Border)myButton.Template.FindName("border", myButton);
            b.Background = Brushes.Gray;
        }
    }
}

Hope it will help.

Please let me know if you have any query.

Regards

Ashish

-------------------------------------------------------------------------

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Answer 2

thank you for your answer.

my problem is i cant find control template.

it is inside setter in style of datagridheaderstyle that i can not access it.

i want know how can i access it.

thankful.

Answer 3

Hi rastinrastini,

I placed template inside the style in my sample code, still i can access the border

XAML

<Window x:Class="WpfApplication28.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <Style x:Key="myStyle" TargetType="{x:Type Button}">            
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="border" Background="Aqua">
                            <ContentPresenter  VerticalAlignment="Center"
                                               HorizontalAlignment="Center"/>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid x:Name="myGrid">
        <Button Content="Hello world" x:Name="myButton" 
                Style="{StaticResource myStyle}"
                VerticalAlignment="Top"/>
        <Button Content="Click" VerticalAlignment="Bottom" Click="Button_Click"/>
    </Grid>
</Window>

.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication28
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Border b = (Border)myButton.Template.FindName("border", myButton);
            if (b != null)
            {
                b.Background = Brushes.Gray;             
            }
        }
    }
}

can you please share your cs code to find out the solution.

Regards

Ashish

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Answer 4

<Grid Height="430" HorizontalAlignment="Left" Margin="14,10,0,0" Name="gridDataGrid" VerticalAlignment="Top" Width="489" Visibility="Hidden" Grid.ColumnSpan="4">
            <DataGrid AutoGenerateColumns="True" Name="dataGridBook" ItemsSource="{Binding}" >
                <DataGrid.ColumnHeaderStyle>
                    <Style TargetType="{x:Type DataGridColumnHeader}">
                        <Style.Setters>
                        <Setter Property="Template">
                            <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
                                        <Grid x:Name="headerGrid">
                                            <Grid.ColumnDefinitions>
                                                <ColumnDefinition Width="auto"></ColumnDefinition>
                                                <ColumnDefinition Width="*"></ColumnDefinition>
                                                <ColumnDefinition Width="*"></ColumnDefinition>
                                            </Grid.ColumnDefinitions>
                                            <Button Content="{TemplateBinding Content}" Grid.Column="0" Click="GridHeaderButton_Click"></Button>
                                            <TextBox x:Name="txt1" Grid.Column="2" Text="{TemplateBinding Content}"></TextBox>
                                            <TextBlock Grid.Column="1" Text="{TemplateBinding Content}"></TextBlock>
                                        </Grid>
                                    </ControlTemplate>
                                </Setter.Value>
                        </Setter>
                        </Style.Setters>
                    </Style>
                </DataGrid.ColumnHeaderStyle>
            </DataGrid>
        </Grid>

very thankful for your answer.

my code for access is this but get null value:

var _gridTemplate = dataGridBook.Template.FindName("headerGrid", dataGridBook)

thankful.

Answer 5

hi all

Setter s1 = (Setter)dataGridBook.ColumnHeaderStyle.Setters[0];
                ControlTemplate _controlTemplate = (ControlTemplate)s1.Value;

with this code i get control template but when i use this

var _txt = _controlTemplate.FindName("headerGrid", dataGridBook);

i get this error

"This operation is valid only on elements that have this template applied."

can anyone help me?

thankful.

Answer 6

Hi rastinrastini,

the key is to get DataGridColumnHeadersPresenter firstly, I suggest you learn more about WPF DataGrid template struct, you could use below code to get the control you want:

DataGridColumnHeadersPresenter chp = null;
Control sv = dataGridBook.Template.FindName("DG_ScrollViewer", dataGridBook) as Control;
if (sv != null)
{
    chp = sv.Template.FindName("PART_ColumnHeadersPresenter", sv) as DataGridColumnHeadersPresenter;
    if (chp != null)
    {
        TextBox tb= ((DataGridColumnHeader)chp.ItemContainerGenerator.ContainerFromIndex(0)).Template.FindName("txt1", (DataGridColumnHeader)chp.ItemContainerGenerator.ContainerFromIndex(0)) as TextBox;
    }
}

You could change the ContainerFromIndex(0) to other column index.

best regards,

---

Sheldon _Xiao[MSFT]
MSDN Community Support | Feedback to us
Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 7

very thankful for your answer.

thankful.

Answer 8

i see it is for .net 4 and 4.5.

then if we use 3.5 how can access these contents?

thankful.

Answer 9

there are no different between 3.5 and 4.0, have you tried it by yourself?

I suggest you try it.

the only difference between 3.5 and 4.0 is there is no DataGrid in 3.5, you should use Toolkit datagrid instead.

I said many times about WPF VisualTree, you can learn it, you could get any control you want by VisualTree.

---

Sheldon _Xiao[MSFT]
MSDN Community Support | Feedback to us
Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 10

very thankful.