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Exporting a Datatable to Excel C#

Posted on 2007-12-05
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I need to put data in the first 5 columns of a datatable into excel usin C#. I tried to start writing it, but I am stuck. I am not an expert at this stuff by no means here is what I have so far:

app = new Excel.Application();
            workbook = app.Workbooks.Open(inputData.testPath, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows,
              "\t", false, false, 0, true, 0, true);

            Excel.Sheets sheets = workbook.Worksheets;

            Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);

            DataTable outputData = sdc.ResultData.Tables[0];

            Excel.Range theRange = FindPlaceToAppendData(worksheet);

            foreach (DataRow row in outputData.Rows)
            {
                //Insert a new Row in excel
                Excel.Range newRow = theRange.EntireRow;
                newRow.Insert(Excel.XlInsertShiftDirection.xlShiftDown, false);

                //dunno if this code is even right
               //  HERE TRYING TO INSERT A ROW INTO EXCEL THEN FILL THE ROW WITH THE VALUES OF
               // THE ROW IN THE DATATABLE (THE FIRST 5 COLUMNS OF IT)
               // IF THERES A BETTER WAY BY ALL MEANS PLEASE HELP!
                int endIndex = worksheet.Cells.SpecialCells(Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeLastCell,Type.Missing).Column;

                for(int i=0;i<endIndex-1;i++)
                {
                   
                }

                    //Set the range value to the array.
                    theRange.set_Value(Missing.Value, saRet);
                }

            }

            app.Workbooks.Close();
            app.Quit();
            GC.Collect();
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Question by:npl77
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5 Comments
 
LVL 7

Expert Comment

by:bungHoc
ID: 20413644
Try this:
public void ToExcel(DataTable dataTable)
{
      string sData = "";
      for(int i = 0; i < dataTable.Columns.Count; i++)
      {
            sData += dataTable.Columns[i].ToString() + "\t";
      }
      sData += "\r\n";
      
      for(int i = 0; i < dataTable.Rows.Count; i++)
      {
            for(int j = 0; j < dataTable.Columns.Count; j++)
            {
                  sData += dataTable.Rows[i][j] + "\t";
            }
            sData += "\r\n";
      }
 
      System.Windows.Forms.Clipboard.SetDataObject(sData);                    
 
      xlsExcel = new Excel.Application();
      xlsBooks = (Excel.Workbooks)m_objExcel.Workbooks;
      xlsBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));
 
      xlsSheets = (Excel.Sheets)m_objBook.Worksheets;
      xlsSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));
      xlsRange = m_objSheet.get_Range("A1", m_objOpt);
      xlsSheet.Paste(m_objRange, false);
 
      // Save the workbook      
}

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Author Comment

by:npl77
ID: 20421092
what is m_objOpt?
0
 

Author Comment

by:npl77
ID: 20421141
also what is m_objRange
0
 

Author Comment

by:npl77
ID: 20421281
this solution is pasting everything in column A1, the needs to go in like this:

Preview of dataTable:

"Data1"     "Data2"     "Data3"   "Data4"    "Data5"
   a                b                 c             d             e
   f                 g                 h             i               j
   k                 l                  m            n              o
...
Excel should look like this:

in row 1 are the headers are already there:
"Data1"     "Data2"     "Data3"  
   a                b                 c          
   f                 g                 h          
   k                 l                  m
...
           
0
 
LVL 7

Accepted Solution

by:
bungHoc earned 2000 total points
ID: 20440082
Been on vacation last week. Sorry for getting back to you late. This is what I forgot to give you ;)


private Excel.Application m_objExcel =  null;
private Excel.Workbooks m_objBooks = null;			
private Excel._Workbook m_objBook = null;		
private Excel.Sheets m_objSheets = null;
private Excel._Worksheet m_objSheet = null;
private Excel.Range m_objRange =  null;
private object m_objOpt = System.Reflection.Missing.Value;

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