demo20230512/Models/ExtensionMethods/PowerUsageExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Weee.Models.ExtensionMethods
{
    public static class PowerUsageExtension
    {
        public static decimal GetTotalPowerPeak(this ICollection<PowerUsage> powerUsages)
        {
            decimal totalPowerPeak = 0;
            foreach (var powerUsage in powerUsages) {
                if (powerUsage.Peak.HasValue) totalPowerPeak += powerUsage.Peak.Value;
            }

            return totalPowerPeak;
        }

        public static decimal GetTotalPowerHalfPeak(this ICollection<PowerUsage> powerUsages)
        {
            decimal totalPowerHalfPeak = 0;
            foreach (var powerUsage in powerUsages) {
                if (powerUsage.HalfPeak.HasValue) totalPowerHalfPeak += powerUsage.HalfPeak.Value;
            }

            return totalPowerHalfPeak;
        }

        public static decimal GetTotalPowerSaturdayHalfPeak(this ICollection<PowerUsage> powerUsages)
        {
            decimal totalPowerSaturdayHalfPeak = 0;
            foreach (var powerUsage in powerUsages) {
                if (powerUsage.SaturdayHalfPeak.HasValue) totalPowerSaturdayHalfPeak += powerUsage.SaturdayHalfPeak.Value;
            }

            return totalPowerSaturdayHalfPeak;
        }

        public static decimal GetTotalPowerOffPeak(this ICollection<PowerUsage> powerUsages)
        {
            decimal totalPowerOffPeak = 0;
            foreach (var powerUsage in powerUsages) {
                if (powerUsage.OffPeak.HasValue) totalPowerOffPeak += powerUsage.OffPeak.Value;
            }

            return totalPowerOffPeak;
        }

        public static decimal GetTotalPowerUsage(this ICollection<PowerUsage> powerUsages)
        {
            return powerUsages.GetTotalPowerPeak() +
                   powerUsages.GetTotalPowerHalfPeak() +
                   powerUsages.GetTotalPowerSaturdayHalfPeak() +
                   powerUsages.GetTotalPowerOffPeak();
        }
    }
}