using System;

using System.Collections.Generic;

using System.Linq;

​

class WarehouseHandlingFee

{

    public decimal startValue { get; set; }

    public decimal fee { get; set; }

    public string calculation_type { get; set; }

    public string value_unit { get; set; }

}

​

class Program

{

    static WarehouseHandlingFee GetHandlingFee(List<WarehouseHandlingFee> warehouseHandlingFeeList, decimal weightKg)

    {

        weightKg = weightKg < warehouseHandlingFeeList.Min(f => f.startValue)

            ? warehouseHandlingFeeList.Min(f => f.startValue)

            : weightKg;

        decimal feeWeight = warehouseHandlingFeeList.Where(x => x.startValue <= weightKg).Max(x => x.startValue);

​

        return warehouseHandlingFeeList.Single(x => x.startValue == feeWeight);

    }

​

    static void Main(string[] args)

    {

        var warehouseHandlingFeeList = new List<WarehouseHandlingFee>

        {

            new WarehouseHandlingFee { startValue = 1.000m, fee = 3.000m, calculation_type = "fixed-fee", value_unit = "weight" },

            new WarehouseHandlingFee { startValue = 10.010m, fee = 7.000m, calculation_type = "fixed-fee", value_unit = "weight" },

            new WarehouseHandlingFee { startValue = 20.010m, fee = 10.000m, calculation_type = "fixed-fee", value_unit = "weight" },

            new WarehouseHandlingFee { startValue = 30.010m, fee = 0.500m, calculation_type = "rate", value_unit = "weight" }

        };

​

        // decimal inputWeight = 30001 / 1000m;

        decimal inputWeight = 30001 / 1000; // wrong

        var handlingFee = GetHandlingFee(warehouseHandlingFeeList, inputWeight);

​

        Console.WriteLine("Input Weight: " + inputWeight);

        Console.WriteLine("Fee Start Value: " + handlingFee.startValue);

        Console.WriteLine("Fee: " + handlingFee.fee);

        Console.WriteLine("Calculation Type: " + handlingFee.calculation_type);

        Console.WriteLine("Value Unit: " + handlingFee.value_unit);

    }

}