Excel单元格值在Excel.Interop和C＃中显示不正确

Question

I am dynamically adding a 13 digit value to an Excel cell via Excel.Interop and C#. However, the value is displayed as something in the lines of 7,21119E+12 instead of 7211192800080 . If you click on the cell, then the display is correct.

//_ReportData is a DataTable with a single item
for (int i = 0; i < _ReportData[0].Rows.Count; i++)
{
    for (int j = 0; j < _ReportData[0].Columns.Count; j++)
    {
        excelCellRange_data = ((Worksheet)excelWorksheet_data).Cells;
        var cellValueRange = ((Range)excelCellRange_data)[i, j + 1];
        if (i == 0)
            ((Range)cellValueRange).Value2 = _ReportData[0].Columns[j].ToString(); //This is where the columns are set
        else
            ((Range)cellValueRange).Value2 = _ReportData[0].Rows[i][j].ToString(); //This is where the values are set
    }
}

Any help please?

Answer 1

That's a Excel-"problem". If you type the number directly in a cell an press enter, the same issue will appear. If you first format the cell as number, it will be shown right.

((Range)cellValueRange).NumberFormat = "0";

Answer 2

You should insert value without ToString() method. Excel should apply format automatically from inserted value type.