在c#中用DataSource DataTable绑定嵌套网格视图

DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(int));
dt.Columns.Add("Name", typeof(string));
dt.Columns.Add("City", typeof(string));

dt.Rows.Add(1, "John", "New York");
dt.Rows.Add(2, "Emma", "London");
dt.Rows.Add(3, "Mike", "Tokyo");

GridView gridView = new GridView();
gridView.DataSource = dt;
gridView.DataBind();

GridView nestedGridView = new GridView();
nestedGridView.DataSource = dt;
nestedGridView.DataBind();

TemplateField nestedField = new TemplateField();
nestedField.ItemTemplate = new GridViewTemplate(ListItemType.Item, nestedGridView);

gridView.Columns.Add(nestedField);

public class GridViewTemplate : ITemplate
{
    private ListItemType _templateType;
    private GridView _nestedGridView;

    public GridViewTemplate(ListItemType templateType, GridView nestedGridView)
    {
        _templateType = templateType;
        _nestedGridView = nestedGridView;
    }

    public void InstantiateIn(Control container)
    {
        if (_templateType == ListItemType.Item)
        {
            container.Controls.Add(_nestedGridView);
        }
    }
}