为GridView添加模板列

public class GridViewTemplate : ITemplate
...{
    private string controlId = null;
    private string dataField = null;
    private Type type;

    public GridViewTemplate(string controlId, Type type, string dataField)
    ...{
        this.controlId = controlId;
        this.type = type;
        this.dataField = dataField;
    }

    public void InstantiateIn(System.Web.UI.Control container)
    ...{
        switch (type.FullName)
        ...{
            case ("System.Web.UI.WebControls.Label"):
                Label label = new Label();
                label.ID = controlId;
                label.DataBinding += new EventHandler(control_DataBinding);
                container.Controls.Add(label);
                break;
            case ("System.Web.UI.WebControls.TextBox"):
                TextBox textBox = new TextBox();
                textBox.ID = controlId;
                textBox.DataBinding += new EventHandler(control_DataBinding);
                container.Controls.Add(textBox);
                break;
            default:
                break;
        }
    }
    private void control_DataBinding(object sender, EventArgs e)
    ...{
        GridViewRow container;
        switch (type.FullName)
        ...{
            case ("System.Web.UI.WebControls.Label"):
                Label label = (Label)sender;
                container = (GridViewRow)label.NamingContainer;
                label.Text = ((DataRowView)container.DataItem)[dataField].ToString();
                break;
            case ("System.Web.UI.WebControls.TextBox"):
                TextBox textBox = (TextBox)sender;
                container = (GridViewRow)textBox.NamingContainer;
                textBox.Text = ((DataRowView)container.DataItem)[dataField].ToString();
                break;
            default:
                break;
        }
    }
} 
通过下面的代码调用上面的类

    protected void GenerateGridViewColumns()
    ...{
        GridView gridView = testGridView;

        TemplateField templateField = new TemplateField();

        templateField.ShowHeader = true;

        templateField.HeaderText = "Id";

        templateField.ItemTemplate = new GridViewTemplate("idLabel", typeof(Label), "Id");

        gridView.Columns.Add(templateField);

        templateField = new TemplateField();

        templateField.ShowHeader = true;

        templateField.HeaderText = "Text";

        templateField.ItemTemplate = new GridViewTemplate("textTextBox", typeof(TextBox), "Text");

        gridView.Columns.Add(templateField);

        gridView.DataSource = CreateDataSource();

        gridView.DataBind();
    }

CreateDataSource返回的是一个DataView，

我试着给gridView的DataSource返回一个List泛型，比如List<GlTreeInfo>,但编译无法通过:
((DataRowView)container.DataItem)[dataField]中的DataItem是GlTreeInfo类,无法 type to DataRowView