扩展：gridview 空数据时显示表头

2015年7月14日16:50:06  Gridview 默认展示数据时，若数据为空，则表格不显示，显示不美观。

针对此问题进行扩展：

using System.Web.UI.WebControls;

public static class GridViewExtension
{
    public static void BindEmptyData(this GridView g)
    {
        if (g.Rows.Count == 0)
        {
            //表头的设置
            GridViewRow row = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
            foreach (DataControlField field in g.Columns)
            {
                TableCell cell = new TableCell();
                cell.Text = field.HeaderText;
                cell.Width = field.HeaderStyle.Width;
                cell.Height = field.HeaderStyle.Height;
                cell.ForeColor = field.HeaderStyle.ForeColor;
                cell.Font.Size = field.HeaderStyle.Font.Size;
                cell.Font.Bold = field.HeaderStyle.Font.Bold;
                cell.Font.Name = field.HeaderStyle.Font.Name;
                cell.Font.Strikeout = field.HeaderStyle.Font.Strikeout;
                cell.Font.Underline = field.HeaderStyle.Font.Underline;
                cell.BackColor = field.HeaderStyle.BackColor;
                cell.VerticalAlign = field.HeaderStyle.VerticalAlign;
                cell.HorizontalAlign = field.HeaderStyle.HorizontalAlign;
                cell.CssClass = field.HeaderStyle.CssClass;
                cell.BorderColor = field.HeaderStyle.BorderColor;
                cell.BorderStyle = field.HeaderStyle.BorderStyle;
                cell.BorderWidth = field.HeaderStyle.BorderWidth;
                row.Cells.Add(cell);
            }
            TableItemStyle headStyle = g.HeaderStyle;
            TableItemStyle emptyStyle = g.EmptyDataRowStyle;
            emptyStyle.Width = headStyle.Width;
            emptyStyle.Height = headStyle.Height;
            emptyStyle.ForeColor = headStyle.ForeColor;
            emptyStyle.Font.Size = headStyle.Font.Size;
            emptyStyle.Font.Bold = headStyle.Font.Bold;
            emptyStyle.Font.Name = headStyle.Font.Name;
            emptyStyle.Font.Strikeout = headStyle.Font.Strikeout;
            emptyStyle.Font.Underline = headStyle.Font.Underline;
            emptyStyle.BackColor = headStyle.BackColor;
            emptyStyle.VerticalAlign = headStyle.VerticalAlign;
            emptyStyle.HorizontalAlign = headStyle.HorizontalAlign;
            emptyStyle.CssClass = headStyle.CssClass;
            emptyStyle.BorderColor = headStyle.BorderColor;
            emptyStyle.BorderStyle = headStyle.BorderStyle;
            emptyStyle.BorderWidth = headStyle.BorderWidth;
            //空白行的设置
            GridViewRow row1 = new GridViewRow(0, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);

            TableCell cell1 = new TableCell();

            cell1.Text = "没有任何数据可以显示";
            cell1.ForeColor = System.Drawing.Color.Purple;
            cell1.BackColor = System.Drawing.Color.White;
            row1.Cells.Add(cell1);
            cell1.ColumnSpan = g.Columns.Count;

            if (g.Controls.Count == 0)
            {
                g.Page.Response.Write("<script language=‘javascript‘>alert(‘请先调用GridView的BindData()方法后 调用此扩展方法!‘);</script>");
            }
            else
            {
                g.Controls[0].Controls.Clear();
                g.Controls[0].Controls.AddAt(0, row);
                g.Controls[0].Controls.AddAt(1, row1);
            }
        }
    }
}

代码调用方式如下：

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindData();
        }
    }

    protected void BindData()
    {
        this.grid_PlantVarietyRight.DataBind();
        this.grid_PlantVarietyRight.BindEmptyData();

    }

显示效果如下图

本扩展主要参考  http://www.cnblogs.com/muer/archive/2010/03/26/1697178.html  稍作扩展，感谢这位哥。