如何以编程方式设置模板和填充WPF DataGrid的内容？

<DataGrid x:Name="myDataGrid">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
        <DataGridTextColumn Header="Age" Binding="{Binding Age}" />
        <!-- 其他列 -->
    </DataGrid.Columns>
</DataGrid>

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    // 其他属性
}

ObservableCollection<Person> people = new ObservableCollection<Person>();
people.Add(new Person { Name = "John", Age = 25 });
people.Add(new Person { Name = "Jane", Age = 30 });
// 添加更多数据

myDataGrid.ItemsSource = people;

<DataGridTemplateColumn Header="Actions">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <!-- 自定义模板内容，例如按钮、图标等 -->
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>