如何知道c#中的excel文件是否为空

using Microsoft.Office.Interop.Excel;

Application excelApp = new Application();

Workbook workbook = excelApp.Workbooks.Open("路径/文件名.xlsx");

Worksheet worksheet = workbook.Worksheets[1]; // 或者使用名称：workbook.Worksheets["Sheet1"];

bool isEmpty = (worksheet.UsedRange.Cells.Count == 1 && worksheet.UsedRange.Cells[1, 1].Value == null);

workbook.Close();
excelApp.Quit();

using Microsoft.Office.Interop.Excel;

public bool IsExcelFileEmpty(string filePath)
{
    Application excelApp = new Application();
    Workbook workbook = excelApp.Workbooks.Open(filePath);
    Worksheet worksheet = workbook.Worksheets[1];

    bool isEmpty = (worksheet.UsedRange.Cells.Count == 1 && worksheet.UsedRange.Cells[1, 1].Value == null);

    workbook.Close();
    excelApp.Quit();

    return isEmpty;
}