Export datatable to excel file

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Hi i have the following codes which allow me to export the data in datatable into excel file. But every time i run the program, the data would not be saved. Or more precise, it didnt run some part of the code at all. Below are my codes:

C#

public static class DataTable_Extensions
    {
        public static void ExportToExcel(this DataTable dt, string folderPath) 
        {
            try 
            {
                if (dt == null || dt.Columns.Count == 0) 
                {
                    throw new Exception("ExportToExcel: Null or empty input table!\n");
                }

                //load the excel and create a new one
                Excel.Application excelApp = new Excel.Application();
                excelApp.Workbooks.Add();

                //one worksheet
                Excel._Worksheet workSheet = excelApp.ActiveSheet;

                //heading for the columns
                for (int i = 0; i < dt.Columns.Count; i++) 
                {
                    workSheet.Cells[1, (i + 1)] = dt.Columns[i].ColumnName;
                }
                //rows
                for (int i = 0; i < dt.Rows.Count; i++) 
                {
                    for (int j = 0; j < dt.Columns.Count; j++) 
                    { 
                        workSheet.Cells[(i+2), (j+1)] = dt.Rows[i][j];
                    }
                }

                //filepath
                //part that it didnt enter
                if (folderPath != null && folderPath != "") 
                {
                    try
                    {
                        workSheet.SaveAs(folderPath);
                        excelApp.Quit();
                        Console.Write("Excel file saved!");
                    }
                    catch (Exception ex)
                    {
                        throw new Exception("ExportToExcel: Excel file could not be saved! Please check file path again." + ex.Message);
                    }
                }
                else 
                {
                    excelApp.Visible = true;
                }
            }
            catch (Exception ex) 
            {
                throw new Exception("ExportToExcel: \n" + ex.Message);
            }
        }

Posted 4-Jun-14 21:14pm

Jamie888

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Comments

Bhushan Patki 5-Jun-14 3:45am

where exactly the code break?

Jamie888 5-Jun-14 3:52am

if (folderPath != null && folderPath != "") at here

DamithSL 5-Jun-14 4:06am

how you call this method?

Jamie888 5-Jun-14 4:56am

from another function like : dt.ExportToExcel(TargetFolder);

DamithSL 5-Jun-14 4:59am

check my answer

Jamie888 5-Jun-14 5:08am

i have tried to debug it. At the line where "workSheet.Cells[(i+2), (j+1)] = dt.Rows[i][j];" locate. Everytime it loops until count 38 it will stop and exit automatically. I have total count of rows at 48.

Jamie888 5-Jun-14 5:53am

i have found this link. Quite helpful.

http://www.codeproject.com/Reference/753207/Export-DataSet-into-Excel-using-Csharp-Excel-Inter

DamithSL 5-Jun-14 5:57am

Add answer to your question and mark it as answer to your question. in future it will help someone. And also mark as answer will remove this question from unanswered list.

3 solutions

Solution 1

Save excelApp also

excelApp .SaveAs(folderPath);

Posted 4-Jun-14 21:22pm

Nivedita_Parihar

Comments

Jamie888 5-Jun-14 3:25am

excepApp didnt have an extension for SaveAs.

Solution 2

in case of no folderpath provider you need to set folder path like below. add below code at the beginning of your method

C#

if (string.IsNullOrEmpty(folderPath))
{
  folderPath= Path.Combine( Environment.CurrentDirectory ,DateTime.Now.ToString("yyyyMMddHHmmssfff")+".xlsx");
}

Posted 4-Jun-14 22:13pm

DamithSL

Updated 4-Jun-14 22:16pm

v2

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Jamie888 · Accepted Answer · 2014-06-05T14:55:00

C#

class Program
    {
        public static bool DebugMode { get; set; }
        public static string TargetFolder { get; set; }
        public static DateTime StartDate { get; set; }
        public static DateTime EndDate { get; set; }
        public static string DebugFolder { get; set; }
        static void Main(string[] args)
        {
            //new Gemini();
            Program p = new Program();

            DebugMode = Convert.ToBoolean(ConfigurationManager.AppSettings["DebugMode"]);
            TargetFolder = Convert.ToString(ConfigurationManager.AppSettings["TargetFolder"]);
            DebugFolder = Convert.ToString(ConfigurationManager.AppSettings["DebugFolder"]);
            StartDate = Convert.ToDateTime(ConfigurationManager.AppSettings["StartDate"]);
            EndDate = Convert.ToDateTime(ConfigurationManager.AppSettings["EndDate"]);

            if (DebugMode)
            {
                var GeminiConnString = ConfigurationManager.ConnectionStrings["GeminiConnString"].ConnectionString;
                SqlConnection conn = null;
                SqlCommand command = null;
                DataTable dt = new DataTable();
                DataSet ds = new DataSet();

                using (conn = new SqlConnection(GeminiConnString)) 
                {
                    using (command = new SqlCommand("dbo.GetGeminiRecordByDate", conn))
                    {
                        conn.Open();
                        command.CommandType = CommandType.StoredProcedure;
                        command.Parameters.AddWithValue("@startDate", StartDate);
                        command.Parameters.AddWithValue("@endDate", EndDate);
                        
                        command.ExecuteNonQuery();

                        SqlDataAdapter da = new SqlDataAdapter(command);
                        da.Fill(ds);
                        dt = ds.Tables[0];

                        //Console.Write("Issue ID");

                        foreach (DataRow dRow in dt.Rows)
                        {
                            Console.WriteLine();
                            Console.Write(dRow["issueid"].ToString());
                            Console.Write('\t');
                            Console.Write(dRow["typedesc"].ToString());
                        }                      
                    } 
                }
                p.ExportToExcel(ds, TargetFolder);
            }
            
        }
        private void ExportToExcel(DataSet ds, string folderPath)
        {
            try
            {
                //load the excel and create a new one
                Excel.Application excelApp = new Excel.Application();

                //open a predefine excel file
                Excel.Workbook excelWorkBook = excelApp.Workbooks.Add();

                foreach (DataTable dt in ds.Tables)
                {
                    //one worksheet
                    Excel.Worksheet workSheet = excelApp.Sheets.Add();

                    //heading for the columns
                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        workSheet.Cells[1, (i + 1)] = dt.Columns[i].ColumnName;
                    }
                    //rows
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        for (int j = 0; j < dt.Columns.Count; j++)
                        {
                            workSheet.Cells[(i + 2), (j + 1)] = dt.Rows[i].ItemArray[j].ToString();
                        }
                    }
                }

                excelWorkBook.SaveCopyAs(folderPath);
                excelWorkBook.Close(false, System.Reflection.Missing.Value, System.Reflection.Missing.Value);
                excelApp.Quit();
                Console.Write("Excel file saved!");
            }

            catch (Exception ex)
            {
                throw new Exception("ExportToExcel: \n" + ex.Message);
            }
        }
    }