通过注册表检查本地office excel版本

            RegistryKey rk = Registry.LocalMachine;
            RegistryKey key03 = rk.OpenSubKey(@"SOFTWARE\\Microsoft\\Office\\11.0\\Word\\InstallRoot\\");
            RegistryKey key07 = rk.OpenSubKey(@"SOFTWARE\\Microsoft\\Office\\12.0\\Word\\InstallRoot\\");
            //检查本机是否安装Office2003
            if (key03 != null)
            {
                //读取offcie03的版本
                string file03 = key03.GetValue("Path").ToString();
                if (File.Exists(file03 + "EXCEL.exe"))
                {
                    _OfficeVersion = "11.0";
                }
            }
            //检查本机是否安装Office2007
            if (key07 != null)
            {
                //读取offcie07的版本
                string file07 = key07.GetValue("Path").ToString();
                if (File.Exists(file07 + "EXCEL.exe"))
                {
                    _OfficeVersion = "12.0";
                }
            }