• C# GridViewExportUtil


    using System.Data;
    using System.IO;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    
    /// <summary>
    /// 导出EXCEL
    /// </summary>
    public class GridViewExportUtil
    {
        /// <summary>
        /// 将GRIDVIEW导出excel
        /// </summary>
        /// <param name="fileName">excel文件名</param>
        /// <param name="gv">GridView</param>
        public static void Export(string fileName, GridView gv)
        {
            HttpContext.Current.Response.Clear();
            //HttpContext.Current.Response.Charset = "GB2312";
            //HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            HttpContext.Current.Response.AddHeader(
                "content-disposition", string.Format("attachment; filename={0}", fileName));
            HttpContext.Current.Response.ContentType = "application/ms-excel";
            HttpContext.Current.Response.Write("<meta http-equiv=Content-Type content="text/html; charset=utf-8">");
    
            using (StringWriter sw = new StringWriter())
            {
                using (HtmlTextWriter htw = new HtmlTextWriter(sw))
                {
                    //  Create a form to contain the grid
                    Table table = new Table();
                    table.GridLines = gv.GridLines;
                    //table.BackColor = gv.BackColor;
                    //  add the header row to the table
                    if (gv.HeaderRow != null)
                    {
                        GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                        table.Rows.Add(gv.HeaderRow);
                        table.Rows[0].BackColor = System.Drawing.Color.Black;
                        table.Rows[0].ForeColor = System.Drawing.Color.White;
                        table.Rows[0].Height = Unit.Pixel(24);
                    }
    
                    //  add each of the data rows to the table
                    foreach (GridViewRow row in gv.Rows)
                    {
                        GridViewExportUtil.PrepareControlForExport(row);
                        row.Height = Unit.Pixel(22);
                        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();
                }
            }
        }
    
        public static void Export(string fileName, DataTable dt)
        {
            using (GridView gv = new GridView())
            {
                gv.DataSource = dt;
                gv.DataBind();
    
                Export(fileName, gv);
            }
        }
    
        /// <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);
                }
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/ilookbo/p/4988491.html
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