I faced a problem yesterday where I have to export a gridview content to excel. The problem was as follows :
User is generating some reports –those reports are displaying in gridview and he also wants to download these reports into a .xls file. So here is the solution-
I created a class GridViewExportToExcel,there is a method: Export which will perform the necessary task. GridViewExportToExcel’s code is given below :-
using System;
using System.Data;
using System.Configuration;
using System.IO;
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;
public class GridViewExportToExcel
{
public static void Export(string fileName, GridView gv)
{
HttpContext.Current.Response.Clear();
//Export will take two parameter first one the name of Excel File, and second one for gridview to be exported
HttpContext.Current.Response.AddHeader(
"content-disposition", string.Format("attachment; filename={0}", fileName));
HttpContext.Current.Response.ContentType = "application/octet-stream";
using (StringWriter strWriter = new StringWriter())
{
using (HtmlTextWriter htmlWriter = new HtmlTextWriter(strWriter))
{
// Create a form to contain the grid
Table table = new Table();
// add the header row to the table
if (gv.HeaderRow != null)
{
GridViewExportToExcel.ExportControl(gv.HeaderRow);
table.Rows.Add(gv.HeaderRow);
}
// add each of the data rows to the table
foreach (GridViewRow row in gv.Rows)
{
GridViewExportToExcel.ExportControl(row);
table.Rows.Add(row);
}
// add the footer row to the table
if (gv.FooterRow != null)
{
GridViewExportToExcel.ExportControl(gv.FooterRow);
table.Rows.Add(gv.FooterRow);
}
// render the table into the htmlwriter
table.RenderControl(htmlWriter);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(strWriter.ToString());
HttpContext.Current.Response.End();
}
}
}
/// Replace controls with literals
private static void ExportControl(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"));
}
//Like that you may convert any control to literals
if (current.HasControls())
{
GridViewExportToExcel.ExportControl(current);
}
}
}
}
Using the above code you may export any data representation control’s data to Excel.
Leave comments if its help you and your suggestion are also welcome.
Happy Programming….:)
For more details, visit http://kaniks.blog.co.in/2008/07/31/aspnet-20-export-gridview-to-excel-c/
|
| Author: FROSTY 19 Feb 2009 | Member Level: Bronze Points : 2 |
I am looking to export a GridView control to Excel. However, here's my catch. The Gridview has 100,000+ rows = multiple pages worth of data.
I have yet to see any C# code that handles more than one page worth of Gridview Data.
Is there a way to do this using the Gridview or should I build the spreadsheet from a direct call to SQL Server???
|