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Software ==>	Visual C# (55 exercises)
Topic ==>	Inheritance (5 exercises)
Level ==>	Average difficulty
Subject ==>	C# training

Create a recurring task class inheriting from a base to-do task

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

The aim of this exercise is to be able to create a sorted dictionary:

Create this so that we can later sort the tasks by date.

You should then be able to create new Task objects:

SingleTask t1 = new SingleTask(System.DateTime.Now.AddDays(7), "Give up smoking");

t1.Create();

SingleTask t2 = new SingleTask(System.DateTime.Now.AddDays(20), "Give up drinking");

t2.Create();

SingleTask t3 = new SingleTask(System.DateTime.Now.AddDays(11), "Audtion for BGT");

t3.Priority = SingleTask.TaskPriority.High;

t3.Create();

// cat needs feeding every week

SingleTask t4 = new RecurringTask(System.DateTime.Today.AddDays(6), "Feed the cat");

t4.Recurrence = SingleTask.TaskRecurrence.Week;

t4.Create();

You can then loop over the dictionary to get the tasks in sorted order:

// create dictionary of normal tasks

foreach (SingleTask t in SingleTask.tasks)

{

SortedTasks.Add(t.DateDue, t.Description);

}

// list out tasks in date order

string s = "";

foreach (KeyValuePair t in SortedTasks)

{

s += t.Key.ToString("dd MMM") + " - " + t.Value + "\n";

}

MessageBox.Show(s);

When this is all working, the exercise will then ask you to create a RecurringTask class. First things first!

Creating a Task Class

Create a SingleTask class to hold the details of each task. You could include the following two enumerations:

public enum TaskPriority { Low, Medium, High }

public enum TaskRecurrence {

Once=0, Day=1, Week=7, Month=30, Year=365 }

By default, tasks should have Medium priority and Once task recurrence.

When code consuming the task calls the Create method, this should add the current instance of the class to a static list of type Task. You'll need to create a constructor and propertes to get the code shown at the start of this exercise to work!

Recurring Tasks

When you've got all of the above working, add a RecurringTask class which inherits from the Task class. Include this in your code so that the new version allows you to add recurring tasks:

// cat needs feeding every week

Task t4 = new RecurringTask(System.DateTime.Today.AddDays(6), "Feed the cat");

t4.Recurrence = Task.TaskRecurrence.Week;

t4.Create();

When you add your 4 tasks (the 3 previous ones and this recurring one), you should see them sorted in date order:

The tasks you've created - recurring ones recur, as you'd expect!

Save and close any files, and give yourself another big pat on the back!

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

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EXERCISE TOPIC

C# EXERCISES

VISUAL C# EXERCISES

Create a recurring task class inheriting from a base to-do task

Creating a Task Class

Recurring Tasks

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