How to get <checkbox> state inside <datagridtemplatecolumn> on any row's checkbox event in datagrid

Question

I have a datagrid - dgUserSession in my WPF application. It contains 3 columns where only 2 text columns are bound with database and first one is checkbox created manually.

<DataGridTemplateColumn>
                                    <DataGridTemplateColumn.CellTemplate>
                                        <DataTemplate>
                                            <CheckBox IsChecked="False" Name="userSelection" Checked="DataGridCheckBox_Checked" Unchecked="DataGridCheckBox_Unchecked"/>
                                        </DataTemplate>
                                    </DataGridTemplateColumn.CellTemplate>
                                    <DataGridTemplateColumn.HeaderTemplate>
                                        <DataTemplate>
                                            <CheckBox Checked="chkHeader_Checked" Unchecked="chkHeader_Unchecked" Name="headerSelection">
                                            </CheckBox>
                                        </DataTemplate>
                                    </DataGridTemplateColumn.HeaderTemplate>
                                </DataGridTemplateColumn>

I want to iterate through each rows state in all four events

private void chkHeader_Checked(object sender, RoutedEventArgs e)
    { 
        for (int i = 0; i < dgUserSession.Items.Count; i++)
        {
}
}

But how to get the checkbox is wether checked or not during this iteration? I spent 3hrs in goggle but no result.

Thanks in advance.

Answer 1

In WPF, it is always best to create your data type classes in the form that is required by the UI . By that, I mean that instead of data binding to two of the three columns in your DataGrid , you should be binding to all three columns. If you add a bool property into the class that is being displayed in each row of the DataGrid , then you can get access to the value of the Checkbox from that class.

If you have not data bound a collection of a custom type to your DataGrid.ItemsSource , then I'd recommend that you do that. Just create a class (that implements the INotifyPropertyChanged interface) and has a property for each column (3 in your case). Then data bind an ObservableCollection of that type to your DataGrid.ItemsSource property:

public ObservableCollection<YourDataType> Items { get; set; }

...

Then in the property setters of your YourDataType class, you will have access to the values of each property/column each time any value is changed:

public someType SomeProperty
{
    get { return someProperty; }
    set 
    {
        someProperty = value;
        NotifyPropertyChanged("SomeProperty");
        // each time this is changed, you have access to the other property values here
    }
}

You can also iterate through the collection to find the values of the Checkbox es:

foreach (YourDataType item in Items)
{
    bool checkBoxValue = item.NewBoolProperty;
}