public double GetSettingDouble(string key, double defaultvalue)
 {
     return(registerclass.GetSettingDouble(key, defaultvalue));
 }
 static public double GetSettingDouble(string key, double defaultvalue, TConn conn = null)
 {
     return(RegisterGet(key, defaultvalue, cn => { var reg = new SQLExtRegister(cn); return reg.GetSettingDouble(key, defaultvalue); }, conn));
 }