public void ExportToExecl()
        {
            System.Windows.Forms.SaveFileDialog sfd = new SaveFileDialog();
            sfd.DefaultExt = "xls";
            sfd.Filter = "Excel文件(*.xls)|*.xls";
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                DoExport(this.lvreport, sfd.FileName);
            }
        }


        #region Kill Special Excel Process
        [DllImport("user32.dll", SetLastError = true)]
        static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);


        private void DoExport(ListView listView, string strFileName)
        {
            int rowNum = listView.Items.Count;
            int columnNum = listView.Items[0].SubItems.Count;
            int rowIndex = 1;
            int columnIndex = 0;
            if (rowNum == 0 || string.IsNullOrEmpty(strFileName))
            {
                return;
            }
            if (rowNum > 0)
            {


                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
                if (xlApp == null)
                {
                    MessageBox.Show("无法创建excel对象，可能您的系统没有安装excel");
                    return;
                }
                xlApp.DefaultFilePath = "";
                xlApp.DisplayAlerts = true;
                xlApp.SheetsInNewWorkbook = 1;
                Microsoft.Office.Interop.Excel.Workbook xlBook = xlApp.Workbooks.Add(true);
                //将ListView的列名导入Excel表第一行
                foreach (ColumnHeader dc in listView.Columns)
                {
                    columnIndex++;
                    xlApp.Cells[rowIndex, columnIndex] = dc.Text;
                }
                //将ListView中的数据导入Excel中
                for (int i = 0; i < rowNum; i++)
                {
                    rowIndex++;
                    columnIndex = 0;
                    for (int j = 0; j < columnNum; j++)
                    {
                        columnIndex++;
                        //注意这个在导出的时候加了“\t” 的目的就是避免导出的数据显示为科学计数法。可以放在每行的首尾。
                        xlApp.Cells[rowIndex, columnIndex] = Convert.ToString(listView.Items[i].SubItems[j].Text) + "\t";
                    }
                }
                //例外需要说明的是用strFileName,Excel.XlFileFormat.xlExcel9795保存方式时 当你的Excel版本不是95、97 而是2003、2007 时导出的时候会报一个错误：异常来自 HRESULT:0x800A03EC。 解决办法就是换成strFileName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal。
                xlBook.SaveAs(strFileName, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                xlApp = null;
                xlBook = null;
                MessageBox.Show("导出报表成功！");
                
                try
                {
                    if (xlApp != null)
                    {
                        int lpdwPeocessId;
                        GetWindowThreadProcessId(new IntPtr(xlApp.Hwnd), out lpdwPeocessId);
                        System.Diagnostics.Process.GetProcessById(lpdwPeocessId).Kill();
                    }
                }
                catch (System.Exception ex)
                {
                    Console.WriteLine("Delete Excel Process Error:" + ex.Message);
                }
            }
        }
        #endregion