关掉由C#自身打开的Excel进程方法

#region 结束EXCEL.EXE进程的方法
        /// <summary>
        /// 结束EXCEL.EXE进程的方法
        /// </summary>
        /// <param name="m_objExcel">EXCEL对象</param>
        [DllImport("user32.dll", SetLastError = true)]
        static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);

        private static void KillSpecialExcel(Microsoft.Office.Interop.Excel.Application m_objExcel)
        {
            try
            {
                if (m_objExcel != null)
                {
                    int lpdwProcessId;
                    GetWindowThreadProcessId(new IntPtr(m_objExcel.Hwnd), out lpdwProcessId);

                    System.Diagnostics.Process.GetProcessById(lpdwProcessId).Kill();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        #endregion