FileStream BookStream = new FileStream(saveFileDialog.FileName.ToString(), FileMode.Create, FileAccess.Write);//定义文件流 book.Write(BookStream);//将工作薄写入文件流 BookStream.Seek(0, SeekOrigin.Begin); //输出之前调用Seek（偏移量，游标位置）方法：获取文件流的长度 BookStream.Close(); MessageBox.Show("导出保存成功！");