从GridView中导出Excel代码

/// <summary>/// /// </summary>public class GridViewExportUtil{    /// <summary>    ///     /// </summary>    /// <param name="fileName"></param>    /// <param name="gv"></param>    public static void Export(string fileName, GridView gv)    {        HttpContext.Current.Response.Clear();        HttpContext.Current.Response.AddHeader(            "content-disposition", string.Format("attachment; filename={0}", fileName));        HttpContext.Current.Response.ContentType = "application/ms-excel";        using (StringWriter sw = new StringWriter())        {            using (HtmlTextWriter htw = new HtmlTextWriter(sw))            {                //  Create a table to contain the grid                Table table = new Table();                //  include the gridline settings                table.GridLines = gv.GridLines;                //  add the header row to the table                if (gv.HeaderRow != null)                {                    GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);                    table.Rows.Add(gv.HeaderRow);                }                //  add each of the data rows to the table                foreach (GridViewRow row in gv.Rows)                {                    GridViewExportUtil.PrepareControlForExport(row);                    table.Rows.Add(row);                }                //  add the footer row to the table                if (gv.FooterRow != null)                {                    GridViewExportUtil.PrepareControlForExport(gv.FooterRow);                    table.Rows.Add(gv.FooterRow);                }                //  render the table into the htmlwriter                table.RenderControl(htw);                //  render the htmlwriter into the response                HttpContext.Current.Response.Write(sw.ToString());                HttpContext.Current.Response.End();            }        }    }    /// <summary>    /// Replace any of the contained controls with literals    /// </summary>    /// <param name="control"></param>    private static void PrepareControlForExport(Control control)    {        for (int i = 0; i < control.Controls.Count; i++)        {            Control current = control.Controls[i];            if (current is LinkButton)            {                control.Controls.Remove(current);                control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));            }            else if (current is ImageButton)            {                control.Controls.Remove(current);                control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));            }            else if (current is HyperLink)            {                control.Controls.Remove(current);                control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));            }            else if (current is DropDownList)            {                control.Controls.Remove(current);                control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));            }            else if (current is CheckBox)            {                control.Controls.Remove(current);                control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));            }            if (current.HasControls())            {                GridViewExportUtil.PrepareControlForExport(current);            }        }    }}

调用示例：GridViewExportUtil.Export("Customers.xls", this.gvCustomers);