VB.NET 2015: Date format column on export to excel file RRS feed

  • Question

  • Hello, firstly thanks for your attemption.
    Some time ago i asked about the fastest way to export to excel from form. I receibed the response y it works propertly.

    About the speed to export the data with this metho is awesome.

    Dim sheetIndex As Integer
                Dim Ex As Object
                Dim Wb As Object
                Dim Ws As Object
                Ex = CreateObject("Excel.Application")
                Wb = Ex.workbooks.add
                Dim col, row As Integer
                Dim rawData(tb_registros.Rows.Count, tb_registros.Columns.Count - 1) As Object
                For col = 0 To tb_registros.Columns.Count - 1
                    rawData(0, col) = tb_registros.Columns(col).ColumnName.ToUpper
                Dim NroCol As Integer = 0
                For col = 0 To tb_registros.Columns.Count - 1
                    fila = 0
                    For row = 0 To tb_registros.Rows.Count - 1
                        rawData(row + 1, col) = tb_registros.Rows(row).ItemArray(col)
                        fila = fila + 1
                    BackgroundWorker1.ReportProgress(NroCol * 100 / tb_registros.Columns.Count)
                    NroCol = NroCol + 1
                    columna = columna + 1
                Dim finalColLetter As String = String.Empty
                finalColLetter = ExcelColName(tb_registros.Columns.Count)
                sheetIndex = sheetIndex + 1
                Ws = Wb.Worksheets(sheetIndex)
                ' = lb_vista.Text
                Dim excelRange As String = String.Format("A1:{0}{1}", finalColLetter, tb_registros.Rows.Count + 1)
                Ws.Range(excelRange, Type.Missing).Value2 = rawData
                Ws = Nothing
                Ex.Application.Visible = True

    The problem with this method is that exports all columns on string format, this means that the date format columns, showes like a number.

    I would be grateful if someone could helpme.


    Monday, February 26, 2018 12:25 PM


  • Use NumberFormat. Simple example

    workRange.NumberFormat = "MM/DD/YYYY"

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    Monday, February 26, 2018 1:26 PM

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