表达式计算器中的内部错误

Question

我有一个C＃项目，我需要更改Excel单元格中的值。这适用于某些部分而不是其他部分，这真的很奇怪。不起作用的部分在这里：

    exApp =  new Microsoft.Office.Interop.Excel.Application();         
        Excel.Workbook exWb = exApp.Workbooks.Open(filepath);
        Excel.Worksheet SumSheet = exWb.Worksheets[1];

        Excel.Range line = (Excel.Range)SumSheet.Rows[4];
        line.Insert();
        SumSheet.Range[SumSheet.Cells[13, 4], SumSheet.Cells[13, 4]].Value = "t1";
        Debug.Print((string)SumSheet.Range[SumSheet.Cells[13, 4], SumSheet.Cells[13, 4]].Value);
        SumSheet.Range[SumSheet.Cells[15, 4], SumSheet.Cells[15, 4]].Value = "t2";
        SumSheet.Range[SumSheet.Cells[15, 4], SumSheet.Cells[15, 5]].FormulaR1C1 = "=SUMME(O6:O400)";

当我尝试更改值时，它会给我错误。 以下代码有效：

 for (int i = 2; i <= exWb.Worksheets.Count; i++)
        {
            int counter = 0;
            int counterMax = 0;
            Excel.Worksheet exWs = exWb.Worksheets[i];
           line = (Excel.Range)exWs.Rows[15];
            line.NumberFormat = "##";
            line.Insert();               
            line.Insert();
            line.Insert();

            for (int j = 2 ; j <= exWs.UsedRange.Columns.Count; j++)
            {                   
                if (exWs.Range[exWs.Cells[13, j], exWs.Cells[13, j]].Value <= 0.3)
                {
                    counter ++;
                    exWs.Range[exWs.Cells[14, j], exWs.Cells[14, j]].Value = 1;
                    exWs.Range[exWs.Cells[14, j], exWs.Cells[14, j]].Interior.Color = Color.Green;
                    exWs.Range[exWs.Cells[15, j], exWs.Cells[15, j]].Value = counter;
                    exWs.Range[exWs.Cells[15, j], exWs.Cells[15, j]].Interior.Color = Color.Green;
                    counterMax = (counter > counterMax) ?  counter : counterMax;
                }
                else
                {
                    counter = 0;
                }                    
            }
            exWs.Range[exWs.Cells[16, 2], exWs.Cells[16, 2]].Value = counterMax;
            fillStart(exWs.Name, counterMax, SumSheet);

            if (counterMax > 45)
            {
                exWs.Range[exWs.Cells[16, 2], exWs.Cells[16, 2]].Interior.Color = Color.Green;
            }
            else
            {
                exWs.Range[exWs.Cells[16, 2], exWs.Cells[16, 2]].Interior.Color = Color.Red;
            }
        }

有什么想法吗？