如何使用NPOI庫在C＃中對excel中的數據進行排序

Question

如何使用C＃和NPOI庫對Excel電子表格中的數據進行排序？

excel電子表格非常簡單。 標題有兩列，“名稱”（列A）和“生日”（列B）。 數據絕不排序。

我的目標是按名稱按字母順序對列表進行排序。 當然，每個名字仍應與正確的生日相匹配。

我該怎么做呢？

Answer 1

這是一個有效的例子。 您需要根據需要為您的文件修改它：

  // start by loading the workbook
  HSSFWorkbook workbook;
  using (var stream = new FileStream(@"c:\Temp\birthdays.xls", FileMode.Open))
  {
    var fs = new POIFSFileSystem(stream);
    workbook = new HSSFWorkbook(fs);
  }

  // now get the worksheet that has the birthdays; I am just using the first sheet
  var birthdaySheet = workbook.GetSheetAt(0);

  // we are going to populate a list of Birthday objects in memory that we can then sort and write back into the file;
  // the Birthday class is defined below
  var birthdays = new Collection<Birthday>();
  for (int i = 0; i < birthdaySheet.LastRowNum; i++) // the LastRowNum property is very useful!
  {
    birthdays.Add(new Birthday
                    {
                      Name = birthdaySheet.GetRow(i).GetCell(0).StringCellValue, // name is in column A, which is 0
                      Bday = birthdaySheet.GetRow(i).GetCell(1).NumericCellValue // birthday is in column B, which is 1
                    });
  }

  // now we sort the birthdays
  var sorted = birthdays.OrderBy(b => b.Name).ToArray();

  // now we go back through the cells and write over the values with the sorted values
  for (int i = 0; i < sorted.Length; i++)
  {
    birthdaySheet.GetRow(i).GetCell(0).SetCellValue(sorted[i].Name);
    birthdaySheet.GetRow(i).GetCell(1).SetCellValue(sorted[i].Bday);
  }

  // finally, save the workbook
  using (var stream = new FileStream(@"c:\temp\birthdays.xls", FileMode.Truncate))
  {
    workbook.Write(stream);
  }

生日課：

class Birthday
{
  public string Name { get; set; }
  public double Bday { get; set; }
}