后台动态绑定Gridview时,数据怎么绑定了2次


gvTest.DataSource = DataTable();//绑定的数据类型为DataTable类型
gvTest.DataBind();//这一步的时候会调用InstantiateIn(System.Web.UI.Control container)
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---------------------------------------后台动态绑定Gridview------------------------------
/// <summary>
/// 实现了ITemplate的InstantiateIn方法。在数据绑定的时候，gridview会自动条用该方法。
/// </summary>
/// <param name="container"></param>
public void InstantiateIn(System.Web.UI.Control container)
{    switch (this.RowType)
    {
        case DataControlRowType.Header:
            Literal headerTitle = new Literal();
            headerTitle.Text = this.ColumnName;
            string htmlTitle = "<div class=\"regWrap\"><div class=\"map\"><ol><li class=\"current\"><b>{0}</b>{1}</li></ol></div></div>";
            string htmlTitleLast = "<div class=\"regWrap\"><div class=\"map\"><ol><li class=\"last\"><b>{0}</b>{1}</li></ol></div></div>";
            LiteralControl div = null;
            if (this.ColumnIndex == this.ColumnCont)//ColumnIndex为当前列下标， ColumnCont为列的
            {
                div = new LiteralControl(string.Format(htmlTitleLast, this.ColumnIndex, this.ColumnName));
            }
            else
            {
                div = new LiteralControl(string.Format(htmlTitle, this.ColumnIndex, this.ColumnName));
            }
            container.Controls.Add(div);
            break;        case DataControlRowType.DataRow:
            HyperLink lb = new HyperLink();
            lb.ID = this.CtlID;
            lb.DataBinding += new EventHandler(LinkButton_DataBinding);
            container.Controls.Add(lb);
            break;        default:
            break;
    }}