using System;using Microsoft.Office.Interop.Excel;using Excel = Microsoft.Office.Interop.Excel;using System.IO;using System.Windows.Forms;using System.Runtime.InteropServices;public class Class2    {        private string filePath;        private Excel.Application app = null;        private Workbook wb;        private Worksheet ws;        private Workbooks wbs;        /// <summary>        /// 创建        /// </summary>        /// <param name="filePath"></param>        public void create(string filePath)        {            this.filePath = filePath;            app = new Excel.Application();            if (app == null)            {                Out.show("无法创建Excel对象,可能您的电脑未安装Excel!");                app.Quit();                GC.Collect();                return;            }            try            {                app.Visible = false;                app.Application.DisplayAlerts = false;            }            catch (Exception e)            {            }            wbs = app.Workbooks;            wb = wbs.Add(Excel.XlWBATemplate.xlWBATWorksheet);            ws = wb.Worksheets[1] as Worksheet;        }        public void Write()        {            ws.Cells[1, 1] = "hello";        }        /// <summary>        /// 保存文件        /// </summary>        public void Save()        {            while (File.Exists(filePath))            {                try                {                    File.Delete(filePath);                    break;                }                catch (Exception e)                {                    if (MessageBox.Show("该文件已被占用,请关闭", "提示", MessageBoxButtons.RetryCancel)                        != DialogResult.Retry)                    {                        break;                    };                }            }            wb.Saved = true;            wb.SaveAs(filePath);            Kill();        }        [DllImport("User32.dll", CharSet = CharSet.Auto)]        public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);        /// <summary>        /// 杀掉对应进程,释放资源        /// </summary>        public void Kill()        {            int processId;            GetWindowThreadProcessId(new IntPtr(app.Hwnd), out processId);            Out.show(processId.ToString());            System.Diagnostics.Process.GetProcessById(processId).Kill();        }    }