Question

我很确定我真的很接近这个问题。我在导入的Excel文档中有数千个IP地址。我输入了一个IP，我想要它，所以程序将该IP地址与excel表中最接近的IP地址匹配，然后打印到控制台。我认为我的问题出在我解析工作表的第一个if语句中。任何帮助将不胜感激。我收到一条错误消息Unhandled Exception：System.NullReferenceException：对象引用不是对象的实例。然后它给出了我的excel表的路径，然后是异常，我猜它假设它在第一个if语句。

using System;
using System.Net;
using Microsoft.Office.Interop.Excel;
using Excel = Microsoft.Office.Interop.Excel;
using System.Data.OleDb;
using System.Data;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;

namespace Investigations
{
    class Program
    {


        static void Main(string[] args)
        {



            IPAddress addr = IPAddress.Parse("8.8.8.8");
            IPHostEntry entry = Dns.GetHostEntry(addr);
            Console.WriteLine("IP Address: " + addr);
            Console.WriteLine("Host Name: " + entry.HostName);


            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(@"C:\subnets.xlsx");
            Excel._Worksheet xlWorksheet = xlWorkbook.Sheets[1];
            Excel.Range xlRange = xlWorksheet.UsedRange;


            bool foundIP = false;
            IPAddress excelIP = IPAddress.Parse("8.8.8.8");

            for (int i = 0; i < xlWorksheet.Rows.Count; i++)
            {


                if (IPAddress.TryParse(xlWorksheet.Cells[i + 1, 1].Value.ToString(), out excelIP))
                    Console.WriteLine(excelIP);
                {

                    // Compare the IP address we found with the one we're looking for                 
                    if (excelIP.Equals(addr))
                    {
                        foundIP = true;
                        break;
                    }
                }
            }

            if (foundIP)
            {
                Console.WriteLine("Found the IP address!");
                Console.WriteLine(excelIP);

                }
            else
            {
                Console.WriteLine("Found the IP address!");
            }

        }

Answer 1

可能是因为您声明了范围对象（使用过的行和列）但随后遍历工作表行（工作表中使用或不使用的所有行）。

试

Excel._Worksheet xlWorksheet = xlWorkbook.Sheets[1];
Excel.Range xlRange = xlWorksheet.UsedRange;

for (int i = 0; i < xlRange.Rows.Count; i++)

...

将字符串值与导入的Excel图纸单元格

1 个答案: