using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;


namespace MTS.CommonComponent
{
    /// <summary>
    /// Gridview绑定的数据记录为空时显示Gridview的表头，并显示没有记录的提示
    /// </summary>
    public class GridViewNull
    {

        //当Gridview数据为空时显示的信息
        private static string EmptyText = "暂无数据";

        public GridViewNull()
        {

        }



        /// <summary>
        /// 防止PostBack后Gridview不能显示
        /// </summary>
        /// <param name="gridview"></param>
        public static void ResetGridView(GridView gridview)
        {
            //如果数据为空则重新构造Gridview
            if (gridview.Rows.Count == 1 && gridview.Rows[0].Cells[0].Text == EmptyText)
            {
                int columnCount = gridview.Columns.Count;
                gridview.Rows[0].Cells.Clear();
                gridview.Rows[0].Cells.Add(new TableCell());
                gridview.Rows[0].Cells[0].ColumnSpan = columnCount;
                gridview.Rows[0].Cells[0].Text = EmptyText;
                gridview.Rows[0].Cells[0].Style.Add("text-align", "center");
            }

        }



        /// <summary>
        /// 绑定数据到GridView，当表格数据为空时显示表头
        /// </summary>
        /// <param name="gridview"></param>
        /// <param name="table"></param>
        public static void GridViewDataBind(GridView gridview, DataTable table, string EmptyText)
        {
            //记录为空重新构造Gridview
            if (table.Rows.Count == 0)
            {

                table = table.Clone();
                table.Rows.Add(table.NewRow());
                gridview.DataSource = table;
                gridview.DataBind();
                int columnCount = table.Columns.Count;
                gridview.Rows[0].Cells.Clear();
                gridview.Rows[0].Cells.Add(new TableCell());
                gridview.Rows[0].Cells[0].ColumnSpan = columnCount;
                gridview.Rows[0].Cells[0].Text = EmptyText;
                gridview.Rows[0].Cells[0].Style.Add("text-align", "center");
            }

            else
            {
                //数据不为空直接绑定
                gridview.DataSource = table;
                gridview.DataBind();
            }

            //重新绑定取消选择
            gridview.SelectedIndex = -1;
        }

    }

}

------解决方案--------------------

在调用的时候~这样做

if (dt.Rows.Count > 0)
           {
               // 当有数据时候，进行这样的帮顶
               GV_DelDoc.DataSource = dt;
               GV_DelDoc.DataBind();
               divDoArea.Visible = true;
           }

           else
           {   // 当没哟数据的时候，自己帮顶一个空的字段