当AutogenerateColumns == True时，是否可以向DataGrid添加更多列？

Question

Simply put, I have a DataGrid in my XML file that I bound to a list - in this example, a list of Person s. However, I also want an extra column, as all entries in this list are going to be a subclass of Person , ie PersonWithAge . I am not allowed to change the type of ListOfPeople , though.

If I add the column in XAML manually, it crashes right away. How can I add this columns and synchronise it with all the rest? Is there some way to cast it within the XAML file? Or can one be added in the m_grid_AutoGeneratingColumn method?

This is my code:

// In MyGridView.xaml.cs
public class MyGridView
{
    public ObservableCollection<Person> ListOfPeople { get; set; }

    private void m_grid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e) 
    {
        /* Some formatting here... */
    }
}

public class Person
{
    public string Name { get; set; }
}

public class PersonWithAge : Person
{
    public int Age{ get; set; }
}

And the XAML code:

// MyGridView.xaml
<UserControl x:Class="Project.MyGridView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>    
         <DataGrid Name="m_myGrid" 
                   ItemsSource="{Binding ListOfPeople}
                   AutoGenerateColumns="True" AutoGeneratingColumn="m_grid_AutoGeneratingColumn" >
                <!--DataGridTextColumn Header="Age" /-->  <!-- This makes the thing crash -->
         </DataGrid >
    </Grid>
</UserControl>

Answer 1

Move columns you are adding in DataGrid.Columns

    <DataGrid Name="m_myGrid" 
               ItemsSource="{Binding ListOfPeople}
               AutoGenerateColumns="True" AutoGeneratingColumn="m_grid_AutoGeneratingColumn" >
            <DataGrid.Columns>
               <DataGridTextColumn Header="Age" Binding="{Binding Age}"/>
            </DataGrid.Columns>
     </DataGrid >