Last Row in a column in excel file using C# (cells does not have get_end method)

Question

When I try and call Cells[fullRow, 1].get_end I get an error, object does not contain a definition for get_end and no extension method could be found.

I never saw anyone complain about this or describe this in comments of old stack overflow threads re the subject of finding last row in an excel column using C#

string path = @"Z:\New folder\Test123.xlsx";
    MyApp = new Excel.Application();
    MyApp.Visible = true;
    MyBook = MyApp.Workbooks.Open(path);
    MySheet = (Excel.Worksheet)MyBook.Sheets[1];

    int fullRow = MySheet.Rows.Count;
    int LastRow = MySheet.Cells[1,1].get_end(Excel.XlDirection.xlUp).Row;

Answer 1

If you assign the return from MySheet.Cells[1, 1] in to a Range object or call the function End , you should find that it works as expected. Also, note the case of the function, it is meant to be: get_End .

        // Working
        Excel.Range firstCell1 = MySheet.Cells[1, 1];
        int LastRow1 = firstCell1.get_End(Excel.XlDirection.xlUp).Row;

        // Working
        Excel.Range firstCell2 = MySheet.Cells[fullRow, 1];
        int LastRow2 = firstCell2.get_End(Excel.XlDirection.xlUp).Row;

        // Working
        int LastRow3 = MySheet.Cells[fullRow, 1].End(Excel.XlDirection.xlUp).Row;

        // Does not work
        int LastRow4 = MySheet.Cells[1, 1].get_End(Excel.XlDirection.xlUp).Row;

I believe the problem is down to the Dynamic Binding done at runtime for COM Interop, but, I am not 100% certain of the reason.

Answer 2

You can use something like this

void Main()
{

    Microsoft.Office.Interop.Excel.Application app;
    Microsoft.Office.Interop.Excel.Workbook wkb;
    app = new Microsoft.Office.Interop.Excel.Application();
    wkb = app.Workbooks.Open(@"e:\temp\test.xlsx");
    int row = GetLastRow(wkb, "sheet1", "A");
    Console.WriteLine(row);
    app.Quit();
}

int GetLastRow(Workbook wkb, string sheet, string column)
{
    Microsoft.Office.Interop.Excel.Worksheet sht = wkb.Worksheets[sheet] as Worksheet;
    Microsoft.Office.Interop.Excel.Range range = sht.Range[column + ":" + column];
    range = range.Cells[range.Rows.Count, range.Column] as Range;
    return range.End[XlDirection.xlUp].Row;
}

You can remove all that Microsoft.Office.Interop.Excel stuff adding the appropriate using directive.