如何在C#中更改Excel表格单元格的背景色

using Excel = Microsoft.Office.Interop.Excel;

Excel.Application excelApp = new Excel.Application();
Excel.Workbook workbook = excelApp.Workbooks.Open("path_to_your_excel_file");

Excel.Worksheet worksheet = workbook.Worksheets[1]; // 选择第一个工作表，索引从1开始

Excel.Range range = worksheet.Range["A1:B2"]; // 选择范围为A1到B2的单元格

range.Interior.Color = Excel.XlRgbColor.rgbRed; // 将单元格背景色更改为红色

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

System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp);