c# Sorting an array with IComparable Interface

Question

I have a jobArray array with 5 jobs that contain a description, hours needed to complete, and an hourly pay that a user enters.

I need to sort the array when it prints by ascending order of the total fee (hours * hourly pay).

The assignment requires I use the IComparable interface when doing so but I'm unsure how to use it. Any help would be appreciated, thank you

Here is my job class

class Job : IComparable
{

    public Job(string description, int hours, double hourRate, double fee)
    {
        Description = description;
        hoursToComplete = hoursToComplete;
        hourlyRate = hourlyRate;
        totalFee = totalFee;

    }

This is the interface I've done to compare totalFees

    public int CompareTo(Job o)
    {
        int returnVal;
        Job temp = (Job)o;
        if (this.totalFee > temp.totalFee)
            returnVal = 1;
        else
            if (this.totalFee < temp.totalFee)
                returnVal = -1;
            else
                returnVal = 0;
        return returnVal;

    }

I'm unsure what do to from here as to sorting the jobs when they print out by total fees.

Answer 1

Here's the working version of your code:

class Job : IComparable<Job>
{
    public string Description { get; set;}

    public int HoursToComplete { get; set;}

    public double HourlyRate { get; set;}

    public double TotalFee { get; set;}

    public Job(string description, 
               int hoursToComplete, 
               double hourlyRate, 
               double totalFee)
    {
        Description = description;
        HoursToComplete = hoursToComplete;
        HourlyRate = hourlyRate;
        TotalFee = totalFee;
    }

    public int CompareTo(Job otherJob)
    {
        int returnVal;

        if (this.TotalFee > otherJob.TotalFee)
            returnVal = 1;
        else
            if (this.TotalFee < otherJob.TotalFee)
            returnVal = -1;
        else
            returnVal = 0;

        return returnVal;
    }
}

Now since you have implemented IComparable<Job>, then on the given List<Job>, just call Sort, which will automatically call Job class CompareTo, instead of object class. Also note I have used the generic version IComparable<Job>, instead of IComparable, to avoid unncessary type-casting