Question

所以，我试图制作一个Excel文档解析器，一切顺利，直到它在Excel中击中空单元格。然后它抛出异常* System.Core.dll中出现“Microsoft.CSharp.RuntimeBinder.RuntimeBinderException”“

namespace ExcelParser {
    class Program
    {
        static void Main(string[] args)
        {
            Excel.Application excelApp = new Excel.Application();
            excelApp.Visible = true;

            string _sourceFile = "F:\\Bullshit\\book1.xlsm";

            excelApp.Workbooks.Open(_sourceFile);

            int row = 1;
            Excel.Worksheet currentSheet = (Excel.Worksheet)excelApp.Workbooks[1].Worksheets[1];
            Console.WriteLine("Initializing");
            while (currentSheet.get_Range("A" + row).Value2 != null)
            {
                List<string> tempList = new List<string>();
                for (char column = 'A'; column < 'J'; column++)
                {
                    Console.Write(column + row.ToString());
                    Excel.Range cell = currentSheet.get_Range(column + row.ToString());
                    Console.WriteLine(cell.Value2.ToString() != "" ? cell.Value2.ToString() : "null!"); // the problem line
                }
                row++;
            }
            Console.ReadKey();
        }
    }
}

Answer 1

如果没有对象，则无法强制转换对象的ToString方法。它将返回null，但null与""不同，请尝试使用此行：

Console.WriteLine(("" + cell.Value2).ToString() != "" ? cell.Value2.ToString() : "null!");

Answer 2

摆脱异常的快速而肮脏的方法就是

try
{
   Console.WriteLine(cell.Value2.ToString() != "" ? cell.Value2.ToString(): "null!");
}
catch(exception e)
{
  Console.WriteLine(e.Argument);
}

Answer 3

对于空单元格，我猜%// read FIRST block fid = fileopen(fileName); M = textscan(fid, readFormat, nLines,'Delimiter',' '); lastPosition = ftell(fid) ; fclose(fid) %// do some stuff %// then read another block: fid = fileopen(fileName); fseek( fid , 'bof' , lastPosition ) ; M = textscan(fid, readFormat, nLines,'Delimiter',' '); lastPosition = ftell(fid) ; fclose(fid) %// and so on ...为空。在这种情况下，您无法在其上调用.ToString（）。

然而，您可以检查它：

cell.Value2

C Sharp ExcelParser在空单元格上抛出异常

3 个答案: