private static (List <VM_Branch> branches, List <BranchMeter> branchMeters) getBranchesAndBranchMeter(int PID)
{
//读取所有仪表
var meters = MeterDAL.GetViewListByPID(PID);
//读取所有支路
var branches = BranchDAL.GetViewListByPID(PID);
var branchMeters = ModelLink.BranchMeterLink(branches, meters);
return(branches, branchMeters);
}