Tuesday, September 9, 2008

ASP.Net 2.0: Export GridView to Excel + c#


I faced a problem yesterday where I have to export a gridview content to excel. The problem was as follows :


User is genearating some reports –those reports are displaying in grdviews and he also wants to download these reports into a xls file. So here is the solution-



I cerated 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….:)


1 comment:

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