c# - 从 Excel 电子表格读取数据 - 无法对空引用执行运行时绑定(bind)

Question

我有下面的代码从 excel 文件中读取数据，我遇到的问题是当我尝试读取范围数据时，我在这一行收到异常“无法对空引用执行运行时绑定(bind)”

if (Int32.TryParse(xlRange.Cells[1, 4].Value2.ToString(), out value)) 

我想知道的是我如何正确访问范围内的信息。提前致谢

void ReadFromExcelToGrid2(String fileNameString)
        {
            try
            {
                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
                Microsoft.Office.Interop.Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(fileNameString);
                //get list of worksheets associated with the current workbook
                Microsoft.Office.Interop.Excel.Sheets worksheets = xlWorkbook.Worksheets;
                //list the work books in a dropdownlist 
                IDictionary<int, String> sheets = new Dictionary<int, String>();
                foreach (Microsoft.Office.Interop.Excel.Worksheet displayWorksheet in xlWorkbook.Worksheets)
                {
                    sheets.Add(displayWorksheet.Index, displayWorksheet.Name);
                }
                cmbWorksheets.DataSource = new BindingSource(sheets, null);;
                cmbWorksheets.DisplayMember = "Value";
                cmbWorksheets.ValueMember = "Key";

                Microsoft.Office.Interop.Excel.Worksheet xlWorksheet = xlWorkbook.Sheets[4]; // assume it is the first sheet
                Microsoft.Office.Interop.Excel.Range xlRange = xlWorksheet.UsedRange; // get the entire used range
                int value = 0;
                if (Int32.TryParse(xlRange.Cells[1, 4].Value2.ToString(), out value)) // get the F cell from the first row
                {
                    int numberOfColumnsToRead = value * 4;
                    for (int col = 7; col < (numberOfColumnsToRead + 7); col++)
                    {
                        Console.WriteLine(xlRange.Cells[1, col].Value2.ToString()); // do whatever with value
                    }
                }
            }
            catch (Exception ex)
            {

                throw ex;
            }
            }

Answer 1

if (xlRange.Cells[row, 1].Text == "")
{
    xlRange.Cells[row, 1].value = "Blank";
}

上面的代码将解决这个问题。但是 Blank 不会出现在单元格中。但它会让你走得更远。基本上 C#/Excel 不喜欢 null。