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我正在处理的应用程序必须获取保存在 excel 中的每个链接并运行它，如果页面状态为 404，我必须将每个链接保存在新的 excel 中（我的意思是在 excel 中是全部，而不是每个链接在一个单独的 excel 中）。到目前为止，我已经设法让每个链接都运行起来，并创建了一个新的 excel，以防我设法让它工作，但不幸的是，我被困在这一点上，我不知道如何或写什么检查现有 Excel 中的 URL 后，每次状态为 404 时保存的代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Office.Interop.Excel;
using OfficeOpenXml;

namespace StartaproUrls
{
 partial class Program
 {
    private static int statusCode;
    private static HttpResponseMessage result;
    private static object[,] valueArray;
    static async Task Main(string[] args)
    {
        using var client = new HttpClient();

        

        string path = @"C:\Users\stefanv\Downloads\startapro_urls.xlsx";
        Application excelApp = new();

        if (excelApp != null)
        {
            Workbook excelWorkbook = excelApp.Workbooks.Open(path);
            Worksheet excelWorksheet = (Worksheet)excelWorkbook.Sheets[1];

            Microsoft.Office.Interop.Excel.Range excelRange = excelWorksheet.UsedRange;
            int rowCount = excelRange.Rows.Count;
            int colCount = excelRange.Columns.Count;

            valueArray = (object[,])excelRange.get_Value(
                        XlRangeValueDataType.xlRangeValueDefault);

            for (int i = 1; i <= 20; i++)
            {
                for (int j = 1; j <= colCount; j++)
                {
                    
                    result = await client.SendAsync(new HttpRequestMessage(HttpMethod.Head, $"https://beta.startapro.hu{valueArray[i, j]}"));
                    statusCode = (int)result.StatusCode;
                    Console.WriteLine(statusCode);  // or result

                } 
            }

            excelWorkbook.Close();
            excelApp.Quit();
        }

        ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
        var file = new FileInfo(@"C:\Users\stefanv\Downloads\startapro_urlsError.xlsx");

        var urlError = GetSetupData();
        await CreateExcelForErrorUrls.SaveExcelFile(urlError, file);
    }


    public static List<UrlErrorModel> GetSetupData()
    {
        List<UrlErrorModel> output = new()
        {
            new() { UrlWithError = valueArray }
        };

        return output;
    }
  }
}

Bellow 是用于创建 Excel 的类

using OfficeOpenXml;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static StartaproUrls.Program;

namespace StartaproUrls
 {
  class CreateExcelForErrorUrls
  {
    public static async Task SaveExcelFile(List<UrlErrorModel> urlError, FileInfo file)
    {
        DeleteIFExists(file);

        using var package = new ExcelPackage(file);

        var ws = package.Workbook.Worksheets.Add("ErrorRaport");

        var range = ws.Cells["A1"].LoadFromCollection(urlError, true);
        range.AutoFitColumns();

        await package.SaveAsync();

    }

    private static void DeleteIFExists(FileInfo file)
    {
        if (file.Exists)
        {
            file.Delete();
        }
    }
   }
 }

Bellow 是 UrlError 的模型

namespace StartaproUrls
 {
  partial class Program
   {
    public class UrlErrorModel
    {
        public object UrlWithError { get; set; }
    }
  }
}
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