How could I access checkbox control placed in WPF datagrid columnHeaderStyle as ContentTemplate

Question

I have placed a checkbox control in an auto-generated WPF datagrid ColumnHeaderStyle as shown below:

<DataGrid.ColumnHeaderStyle>
            <Style TargetType="DataGridColumnHeader">
                <Setter Property="ContentTemplate">
                    <Setter.Value>
                        <DataTemplate>
                            <CheckBox x:Name="HeaderCheckBox" Content="{Binding}" />
                        </DataTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </DataGrid.ColumnHeaderStyle>

How could I access the CheckBox in code behind? There would be multiple columns in datagrid, how could I find out (column-wise) checkbox is selected or not ?
Please suggest.

Find a WPF element inside DataTemplate in the code-behind

franssu
– franssu

2014-06-23 10:52:23 +00:00
Commented Jun 23, 2014 at 10:52 — franssu
– franssu, Commented Jun 23, 2014 at 10:52

MRebai · Accepted Answer · 2014-06-23 11:06:20Z

1

Just add the events Checked and Unchecked and once you checked it the event ll be raised

 <DataGrid.ColumnHeaderStyle>
                <Style TargetType="DataGridColumnHeader">
                    <Setter Property="ContentTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <CheckBox x:Name="HeaderCheckBox" Content="{Binding}"
                                 Checked="CheckBoxChanged" Unchecked="CheckBoxChanged"/>
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
    </DataGrid.ColumnHeaderStyle>

answered Jun 23, 2014 at 11:06

MRebai

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3 Comments

DevX Over a year ago

Thanks moez for the response. I have one more query, my datagrid have some readonly columns and I don't want to show checkbox in header for these columns, how could I achieve this?

MRebai Over a year ago

ok, First if this answer works fine plz make it as answer, then to fix your issue you just need to add a DataTemplate.Triggers to your column datatemplate

DevX Over a year ago

Thanks moez.I have marked your response as answer. Your response was helpful. I tried to use DataTemplate.Triggers but didn't find IsReadOnly property to check in this context. Could you please help, how to use triggers to hide checkbox for readonly columns.

user2815841 · Accepted Answer · 2014-06-23 15:49:43Z

Just implement Checked and Unchecked events

  <DataGrid.ColumnHeaderStyle>
                    <Style TargetType="DataGridColumnHeader">
                        <Setter Property="ContentTemplate">
                            <Setter.Value>
                                <DataTemplate>
                                    <CheckBox x:Name="HeaderCheckBox" Content="{Binding}"
                                     Checked="CheckBoxChanged" Unchecked="CheckBoxChanged"/>
                                </DataTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
        </DataGrid.ColumnHeaderStyle>

     private void CheckBoxChanged(object sender, RoutedEventArgs e)
     {
                // add what you want
     }

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