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Convert datatable to excel or csv file and save to client computer(asp.net application)

Posted on 2010-09-14
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Last Modified: 2012-05-10
On the click of a button I pass a datatable to a method to generate an excel file.
Since this is a web application I want to be able to use a file dialog to save the file
locally to my computer.

how can i acheive this pls ?




/// <summary>

    /// The click of this button will convert the datatable to csv format and save in the c:\directory

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    protected void btnExcel_Click(object sender, EventArgs e)

    {

        SaveDataTableToCsvFile(@"c:\sample.csv", dtg, ",");

    }





    public static void SaveDataTableToCsvFile(string AbsolutePathAndFileName, DataTable TheDataTable, params string[] Options)

    {



        try

        {

            //variables

            string separator;

            if (Options.Length > 0)

            {

                separator = Options[0];

            }

            else

            {

                separator = ","; //default

            }

            string quote = "\"";



            //create CSV file

            StreamWriter sw = new StreamWriter(AbsolutePathAndFileName);

           

            //write header line

            int iColCount = TheDataTable.Columns.Count;

            for (int i = 0; i < iColCount; i++)

            {

                sw.Write(TheDataTable.Columns[i]);

                if (i < iColCount - 1)

                {

                    sw.Write(separator);

                }

            }

            sw.Write(sw.NewLine);



            //write rows

            foreach (DataRow dr in TheDataTable.Rows)

            {

                for (int i = 0; i < iColCount; i++)

                {

                    if (!Convert.IsDBNull(dr[i]))

                    {

                        string data = dr[i].ToString();

                        data = data.Replace("\"", "\\\"");

                        sw.Write(quote + data + quote);

                    }

                    if (i < iColCount - 1)

                    {

                        sw.Write(separator);

                    }

                }

                sw.Write(sw.NewLine);

            }

            sw.Close();

        }

        catch (Exception ex)

        {

            //MessageBox.Show(ex.Message);

        }

    }

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Comment
Question by:Sirdots
3 Comments
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 33679030
Since the code you have will be executed on the SERVER, not on the client, you may have a bit of a problem.  

Generally, web apps do not have WRITE permission on the client - that would be a serious security hole.

AW
0
 
LVL 42

Accepted Solution

by:
sedgwick earned 500 total points
ID: 33679811
attached is a function which exports datatable to csv.

to enable saving it on the local computer you can stream the csv file to the client browser:

HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.AddHeader( "content-disposition","attachment;
filename=" + <filename>);
HttpContext.Current.Response.BinaryWrite(File.ReadAllBytes(<filename>));
HttpContext.Current.Response.End();

<filename> - csv file path


http://dotnetguts.blogspot.com/2007/01/exporting-datatable-to-csv-file-format.html
http://www.velocityreviews.com/forums/t92977-csv-file-download-from-an-asp-net-page-issue.html
public static void ExportToCSV(DataTable dt, string strFilePath, string fileName)
        {
            var sw = new StreamWriter(strFilePath + fileName, false);

            // Write the headers.
            int iColCount = dt.Columns.Count;
            for (int i = 0; i < iColCount; i++)
            {
                sw.Write(dt.Columns[i]);
                if (i < iColCount - 1) sw.Write(",");
            }

            sw.Write(sw.NewLine);

            // Write rows.
            foreach (DataRow dr in dt.Rows)
            {
                for (int i = 0; i < iColCount; i++)
                {
                    if (!Convert.IsDBNull(dr[i]))
                    {
                        if (dr[i].ToString().StartsWith("0"))
                        {
                            sw.Write(@"=""" + dr[i] + @"""");
                        }
                        else
                        {
                            sw.Write(dr[i].ToString());
                        }
                    }

                    if (i < iColCount - 1) sw.Write(",");
                }
                sw.Write(sw.NewLine);
            }

            sw.Close();
        }

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Author Closing Comment

by:Sirdots
ID: 33855368
The file dialog was not shown here
0

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