如何用C#获取Excel表格中给定行的列数？

using Excel = Microsoft.Office.Interop.Excel;

// 创建Excel应用程序对象
Excel.Application excelApp = new Excel.Application();

// 打开Excel文件
Excel.Workbook workbook = excelApp.Workbooks.Open("文件路径");

// 获取工作表对象
Excel.Worksheet worksheet = workbook.Worksheets["工作表名称"];

int rowNumber = 1; // 给定行号
int columnCount = worksheet.Cells[rowNumber, worksheet.Columns.Count].End[Excel.XlDirection.xlToLeft].Column;

// 关闭工作簿
workbook.Close();

// 关闭Excel应用程序
excelApp.Quit();

// 释放资源
System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp);