一天是一日，一日是一天（GridView的小常识）

[twtetg]

唉，日来日去的，虚度光阴，真无聊啊。。。

以下是GridView绑定无数据时显示表头和空行文字代码，希望能对初学者有用，

 1 //使用方法:
  2 //在page_load事件中加入下列样式代码,其中grdPay为GridView. 必须设置grdPay的EmptyDataText属性不为空.
  3         if (this.IsPostBack == false)
  4         {
  5                 grdPay.DataBind();
  6         }
  7         UGridView grd = new UGridView(grdPay);
  8 
  9 //源程序
 10 using System;
 11 using System.Data;
 12 using System.Configuration;
 13 using System.Web;
 14 using System.Web.Security;
 15 using System.Web.UI;
 16 using System.Web.UI.WebControls;
 17 using System.Web.UI.WebControls.WebParts;
 18 using System.Web.UI.HtmlControls;
 19 
 20 public class UGridView
 21 {
 22     public UGridView(GridView grd)
 23     {
 24         if (grd.EmptyDataText == "")
 25         {
 26             grd.EmptyDataText = "没有符合条件的数据";
 27         }
 28         grd.PreRender += new EventHandler(grd_PreRender);        
 29     }
 30 
 31     void grd_PreRender(object sender, EventArgs e)
 32     {
 33         DrawHeader(sender);
 34     }
 35     private void Grd_RowDataBound(object sender, GridViewRowEventArgs e)
 36     {
 37         if (e.Row.RowIndex == -1)
 38         {
 39             DrawHeader(sender);
 40         }
 41     }
 42     private void DrawHeader(object sender)
 43     { 
 44         GridView grd = (GridView)sender;
 45         if (grd.Rows.Count > 0) return; //有数据，不要处理
 46         if (grd.DataSource != null)
 47         {
 48             if (((DataTable)grd.DataSource).Rows.Count > 0)
 49             {
 50                 return;
 51             }
 52         }
 53         GridViewRow row = new GridViewRow(-1, -1,DataControlRowType.EmptyDataRow,DataControlRowState.Normal);
 54         foreach (DataControlField field in grd.Columns) 
 55         {
 56             TableCell cell = new TableCell();
 57             cell.Text = field.HeaderText;
 58             cell.Width = field.HeaderStyle.Width;
 59             cell.Height = field.HeaderStyle.Height;
 60             cell.ForeColor = field.HeaderStyle.ForeColor;
 61             cell.Font.Size = field.HeaderStyle.Font.Size;
 62             cell.Font.Bold = field.HeaderStyle.Font.Bold;
 63             cell.Font.Name = field.HeaderStyle.Font.Name;
 64             cell.Font.Strikeout = field.HeaderStyle.Font.Strikeout;
 65             cell.Font.Underline = field.HeaderStyle.Font.Underline;
 66             cell.BackColor = field.HeaderStyle.BackColor;
 67             cell.VerticalAlign = field.HeaderStyle.VerticalAlign;
 68             cell.HorizontalAlign = field.HeaderStyle.HorizontalAlign;
 69             cell.CssClass = field.HeaderStyle.CssClass;
 70             cell.BorderColor = field.HeaderStyle.BorderColor;
 71             cell.BorderStyle = field.HeaderStyle.BorderStyle;
 72             cell.BorderWidth = field.HeaderStyle.BorderWidth;
 73             row.Cells.Add(cell);                
 74         }     
 75        
 76         TableItemStyle headStyle = grd.HeaderStyle;
 77         TableItemStyle emptyStyle = grd.EmptyDataRowStyle;
 78         emptyStyle.Width = headStyle.Width;
 79         emptyStyle.Height = headStyle.Height;
 80         emptyStyle.ForeColor = headStyle.ForeColor;
 81         emptyStyle.Font.Size = headStyle.Font.Size;
 82         emptyStyle.Font.Bold = headStyle.Font.Bold;
 83         emptyStyle.Font.Name = headStyle.Font.Name;
 84         emptyStyle.Font.Strikeout = headStyle.Font.Strikeout;
 85         emptyStyle.Font.Underline = headStyle.Font.Underline;
 86         emptyStyle.BackColor = headStyle.BackColor;
 87         emptyStyle.VerticalAlign = headStyle.VerticalAlign;
 88         emptyStyle.HorizontalAlign = headStyle.HorizontalAlign;
 89         emptyStyle.CssClass = headStyle.CssClass;
 90         emptyStyle.BorderColor = headStyle.BorderColor;
 91         emptyStyle.BorderStyle = headStyle.BorderStyle;
 92         emptyStyle.BorderWidth = headStyle.BorderWidth;
 93         if (grd.Controls.Count == 0)
 94         {
 95             grd.Page.Response.Write("<script language='javascript'>alert('必须在初始化表格类之前执行DataBind方法并设置EmptyDataText属性不为空!');</script>");
 96         }
 97         else
 98         {
 99             grd.Controls[0].Controls.Clear(); //删除没数据时的提示
100             grd.Controls[0].Controls.AddAt(0, row);
101         }          
102 
103     }
104 
105