C# 如何导出日期？ Microsoft.Office.Interop.Excel.Application Excel=new Microsoft.Office.Interop.Excel.Application（）； 工作簿wb=Excel.Workbooks.Add（XlSheetType.xlWorksheet）； 工作表ws=（工作表）Excel.ActiveSheet； Excel.Visible=true； ws.Cells[1,1]=“Tarih”； ws.Cells[1,2]=“Kasiyer”； ws.Cells[1,3]=“Ucret”； ws.Cells[1,4]=“Bilet No”； ws.Cells[1,5]=“Firma Adı”； 对于（int j=2；j

您可能无法获取日期值，它返回null并给出错误。仅对于日期列，您尝试转换

 Microsoft.Office.Interop.Excel.Application Excel = new Microsoft.Office.Interop.Excel.Application();
        Workbook wb = Excel.Workbooks.Add(XlSheetType.xlWorksheet);
        Worksheet ws = (Worksheet)Excel.ActiveSheet;
        Excel.Visible = true;

        ws.Cells[1, 1] = "Tarih";
        ws.Cells[1, 2] = "Kasiyer";
        ws.Cells[1, 3] = "Ucret";
        ws.Cells[1, 4] = "Bilet No";
        ws.Cells[1, 5] = "Firma Adı";
        for (int j = 2; j < dataGridView1.Rows.Count; j++)
        {
            for (int i = 2; i <= 5; i++)
            {
                ws.Cells[j,i]=dataGridView1.Rows[j-2].Cells[i-1].Value;
            }
        }

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你调试过吗？dataGridView1.行[j-2]。单元格[i-1]的值是什么？值是日期、出纳、费用、票号和公司名称。日期不导出到Excel程序告诉我“HRESULTözel durum döndürdü：0x800A03EC”看。@SercanDeveci

for (int i = 1; i < dataGridView1.Rows.Count; i++)
    {
        ws.Cells[i,0] = (Convert.ToDateTime(ws.Cells[i,0]).ToOADate();
    }

Microsoft.Office.Interop.Excel.Range range = (Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Cells[1, 1];
range = range.get_Resize(rowCount, columnCount);
range.EntireColumn.NumberFormat = "DD/MM/YYYY";