Merge multiple excel files into one excel File

Good afternoon, everyone:

When the younger brother merged multiple excel files from the crystal mirror table into one excel file, he found the following problem:

The sheet and the table are duplicated, that is, the text of the sheet is overwritten. If I create an excel file separately, each file contains porn and text. There is no problem with using the same method (as shown below) (the text is separated ). How can you solve this problem. Multi-region !!!


Private void MergeExcelFiles (string fileName, System. Collections. ArrayList
Files)
{
Excel. Application exlApp = new Excel. ApplicationClass ();

ExlApp. Application. SheetsInNewWorkbook = 1;
Excel. Workbook excelWorkBook =
ExlApp. Workbooks. Add (Excel. XlWBATemplate. xlWBATWorksheet );
ExcelWorkBook = exlApp. Workbooks. Add (Excel. XlWBATemplate. xlWBATWorksheet );
Excel. Worksheet excelWorkSheet =
(Excel. Worksheet) excelWorkBook. ActiveSheet;
ExcelWorkBook. Saved = true;
ExcelWorkBook. SaveCopyAs (fileName );
ExcelWorkBook. Close (null, null, null );
ExcelWorkBook = null;
ExcelWorkSheet = null;

ExlApp. Application. Visible = false;
ExlApp. Application. AlertBeforeOverwriting = false;

Object missing = System. Reflection. Missing. Value;
Excel. Workbook wkBookDest;
Excel. Workbook wkBookOrign;

Try
{
WkBookDest = exlApp. Workbooks. Open (fileName,
Missing, false, missing,
Missing, true, missing,
Missing, missing );


For (int I = 0; I <files. Count; I ++)
{

String OrignfileName = files [I]. ToString ();

WkBookOrign = exlApp. Workbooks. Open (OrignfileName,
Missing, true, missing,
Missing, false, missing,
Missing, missing );


Int nOrignSheetsCount = wkBookOrign. Worksheets. Count;
Int nDestSheetsCount = wkBookDest. Worksheets. Count;

Excel. Worksheet wkSheetDest;

WkSheetDest = wkBookDest. Worksheets. Add (missing,
WkBookDest. Worksheets [nDestSheetsCount],
NOrignSheetsCount,
Excel. XlSheetType. xlWorksheet) as Excel. Worksheet;


For (int j = 1; j <= nOrignSheetsCount; j ++)
{
Excel. Worksheet wkSheetOrign = wkBookOrign. Worksheets [j]
Excel. Worksheet;

WkSheetDest = wkBookDest. Worksheets [nDestSheetsCount + j]
Excel. Worksheet;
WkSheetDest. Activate ();
WkSheetDest. Name = GetSheetName (OrignfileName );
Excel. Range range =
WkSheetOrign. Cells. SpecialCells (Excel. XlCellType. xlCellTypeLastCell, missing );

Int nRow = range. Row;
Int nColumn = range. Column;

Excel. Range rngOrign =
WkSheetOrign. get_Range (wkSheetOrign. Cells [1,1], wkSheetOrign. Cells [nRow,
NColumn]);

Excel. Range rngDest = wkSheetDest. get_Range (wkSheetDest. Cells [1, 1],
WkSheetDest. Cells [nRow, nColumn]);

RngOrign. Copy (missing );
WkSheetDest. Paste (rngDest, missing );
WkBookDest. Save ();
}
WkBookOrign. Close (false, null, null );
}

Excel. Worksheet temp = (Excel. Worksheet) (wkBookDest. Worksheets [1]);
Temp. Delete ();
Temp = null;

WkBookDest. Save ();
WkBookDest. Close (null, null, null );
}
Catch (Exception ex)
{
CommonModule. Functions. ShowErrorMessageBox (ex. Message, "Save response parameters ");
}
Finally
{
WkBookDest = null;
WkBookOrign = null;
ExlApp. Quit ();
ExlApp = null;

GC. Collect ();
}

CommonModule. Functions. DeleteTempFiles ();
}
Private string GetSheetName (string fullName)
{
String fileName = new System. IO. FileInfo (fullName). Name;
Int index = fileName. IndexOf (".");
String sheetName = fileName. Substring (0, index );
Return sheetName;
}