.NET Simplified

The below is the code that was discussed and created during the training session about using the collections and List available in .NET like Queue, Stack, HashTable and SortedList. In the process, using Indexers were also covered. Students were asked to create a small application using everything learnt. The extract of that code is given below.

        private void RunExample()
        {
            // Queue Example
            QueueExample();

            // Stack Example
            StackExample();

            // Hash Table Example
            HashTableExample();

            // Hash Table Example
            SortedListExample();

            // Indexer Example
            Indexer();
        }

        private void QueueExample()
        {
            Queue<Employee> employeeQueue = new Queue<Employee>();
            // Load Applicants
            for (int i = 1; i <= 10; i++)
            {
                Employee employee = new Employee() { Name = "Employee No. " + i.ToString() };
                employeeQueue.Enqueue(employee);
                lstEmployeeQueue.Items.Add(employee.Name);
            }

            // Select 5 applicants based on their order in the queue
            for (int i = 1; i <= 5; i++)
            {
                Employee queuedEmployee = employeeQueue.Dequeue();
                lstEmployeeSelected.Items.Add(queuedEmployee.Name);
            }
        }

        private void StackExample()
        {
            Stack<Employee> seniorityStack = new Stack<Employee>();

            // Load Employees
            for (int i = 10; i >= 1; i--)
            {
                Employee employee = new Employee() { Name = "Employee Exp: " + i.ToString() + " Years."};
                seniorityStack.Push(employee);
                lstSeniority.Items.Add(employee.Name);
            }

            // Select 5 junior employees based on their level of seniority
            for (int i = 1; i <= 5; i++)
            {
                Employee juniorEmployee = seniorityStack.Pop();
                lstTerminated.Items.Add(juniorEmployee.Name);
            }
        }

        private void HashTableExample()
        {
            country.Add("US", "United States");
            country.Add("UK", "United Kingdom");
            country.Add("IN", "India");
            country.Add("AU", "Australia");
            country.Add("CA", "Canada");

            cmbCountry.Items.Add(country["US"].ToString());
            cmbCountry.Items.Add(country["UK"].ToString());
            cmbCountry.Items.Add(country["IN"].ToString());
            cmbCountry.Items.Add(country["AU"].ToString());
            cmbCountry.Items.Add(country["CA"].ToString());
        }

        private void cmbCountry_SelectedIndexChanged(object sender, EventArgs e)
        {
            foreach (DictionaryEntry de in country)
            {
                if (de.Value.Equals(cmbCountry.Text))
                {
                    lblCode.Text = de.Key.ToString();
                    lblCountry.Text = de.Value.ToString();
                    return;
                }
            }
        }

        private void SortedListExample()
        {
            // Load employees into ArrayList that's unsorted
            ArrayList employeeListUnSorted = new ArrayList();

            employeeListUnSorted.Add(new Employee() { Name = "Lakshman" });
            employeeListUnSorted.Add(new Employee() { Name = "Richard" });
            employeeListUnSorted.Add(new Employee() { Name = "Arjun" });
            employeeListUnSorted.Add(new Employee() { Name = "John" });
            employeeListUnSorted.Add(new Employee() { Name = "Rajesh" });
            employeeListUnSorted.Add(new Employee() { Name = "Kareem" });

            foreach (Employee employee in employeeListUnSorted)
            {
                lstUnSorted.Items.Add(employee.Name);
            }

            // Create Sorted List from UnSorted list
            SortedList<string, Employee> employeeListSorted = new SortedList<string, Employee>();
            foreach (Employee employee in employeeListUnSorted)
            {
                employeeListSorted.Add(employee.Name, employee);
            }

            // Display the employees in SortedList
            foreach (string key in employeeListSorted.Keys)
            {
                lstSorted.Items.Add(key);
            }
        }

        private void Indexer()
        {
            // The Employee class has an indexer for address defined
            Employee employee = new Employee { Name = "Rakesh" };
            employee[0] = "Address 1";
            employee[1] = "Address 1";
            employee[2] = "Address 1";

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < 3; i++)
            {
                sb.AppendLine(employee[i]);
            }
            MessageBox.Show(sb.ToString());
        }

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