private void cmbConfigs_SelectedIndexChanged(object sender, EventArgs e)
{
string strConfigName = this.cmbConfigs.Text;
//更改数据库配置
this.ctl.SetConfigsNotUsed(strConfigName);
this.ctl.SetConfigsUsed(strConfigName);
reset_current_config_table(strConfigName);
//重新初始化教室
MemoryTable.RefreshRoomConfigTable();
this.dtRoomConfig = MemoryTable.dtRoomConfig;
this.InitialClassRoom();
}