根据您的问题，您希望读取Excel文件（xlsx）。读取它的内容的最好方法是使用名为ExcelDataReader的包。安装到你的nuget包中。它是免费和开源的。
get excel sheet row id using exceldatareader into dataset
或者使用此代码作为示例。

public static DataTable ReadExcelFile(string filePath)
  {
     using (var stream = File.Open(filePath, FileMode.Open, FileAccess.Read))
      {
         using (var reader = ExcelReaderFactory.CreateReader(stream))
        {
        // Choose the specific sheet in the Excel file (e.g., 
         reader.AsDataSet().Tables["Sheet1"])
        var result = reader.AsDataSet().Tables[0];

        return result;
    }
    }
   }

如果不起作用，

string url = "blob:testPie.co.uk/c7a70bf0-7495-48f8-b989-be0035eb79fd";
 string fileName = Path.GetFileName(url);

 using (WebClient client = new WebClient())
{
  client.DownloadFile(url, fileName);
  using (FileStream stream = File.OpenRead(fileName))
  {
    // Use the file stream here as needed
    // ...
  }
   // Once you're done with the file, you can delete it
   File.Delete(fileName);
  }