Sunday, 29 May 2016

c# treeview


//form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using CPRG253.RealEstate.Domain;

namespace CPRG253.RealEstate.App
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            PopulateTree();
        }

        private void PopulateTree()
        {
            TreeNode citiesNode = new TreeNode("Cities");
            TreeNode cityNode = null;
            TreeNode repNode = null;
            TreeNode propertyNode = null;

            uxTree.Nodes.Add(citiesNode);

            List<City> cities = FileAccessObject.GetCities();
            citiesNode.Tag = cities;

            foreach(City city in cities)
            {
                cityNode = new TreeNode(city.Name);
                cityNode.Tag = city;
                citiesNode.Nodes.Add(cityNode);

                foreach(SalesRep rep in city.SalesReps)
                {
                    repNode = new TreeNode(rep.FullName);
                    repNode.Tag = rep;
                    cityNode.Nodes.Add(repNode);

                    foreach(Property property in rep.Properties)
                    {
                        propertyNode = new TreeNode(property.Address);
                        propertyNode.Tag = property;
                        repNode.Nodes.Add(propertyNode);
                    }
                }
            }
        }

        private void uxTree_AfterSelect(object sender, TreeViewEventArgs e)
        {
            switch (e.Node.Level)
            {
                case 0:
                    FormatCities(e.Node.Tag);
                    break;
                case 1:
                    FormatSalesReps(e.Node.Tag);
                    break;
                case 2:
                    FormatProperties(e.Node.Tag);
                    break;
                case 3:
                    FormatProperty(e.Node.Tag);
                    break;
            }
        }

        private void FormatCities(object taggedObject)
        {
            //cast the taggedObject to List<City>
            List<City> cities = (List<City>)taggedObject;

            //the list view will have 2 columns
            uxDetails.Columns.Clear();
            uxDetails.Columns.Add("City", 200);
            uxDetails.Columns.Add("Sales Reps Count", 200);

            //add the items to the listview
            uxDetails.Items.Clear();
            ListViewItem item;
            foreach(City city in cities)
            {
                item = new ListViewItem();
                item.Text = city.Name;
                item.SubItems.Add(new ListViewItem.ListViewSubItem { Text = city.SalesReps.Count.ToString() });
                uxDetails.Items.Add(item);
            }          
        }

        private void FormatSalesReps(object taggedObject)
        {
            City city = (City)taggedObject;

            //the list view will have 2 columns
            uxDetails.Columns.Clear();
            uxDetails.Columns.Add("Sales Representative", 200);
            uxDetails.Columns.Add("Property Count", 200);

            //add the items to the listview
            uxDetails.Items.Clear();
            ListViewItem item;
            foreach(SalesRep rep in city.SalesReps)
            {
                item = new ListViewItem();
                item.Text = rep.FullName;
                item.SubItems.Add(new ListViewItem.ListViewSubItem { Text = rep.Properties.Count.ToString() });
                uxDetails.Items.Add(item);
            }
        }

        private void FormatProperties(object taggedObject)
        {
            SalesRep rep = (SalesRep)taggedObject;

            //the list view will have 3 columns
            uxDetails.Columns.Clear();
            uxDetails.Columns.Add("Address", 200);
            uxDetails.Columns.Add("Property Type", 150);
            uxDetails.Columns.Add("Owner", 150);

            //add the items to the listview
            uxDetails.Items.Clear();
            ListViewItem item;
            foreach (Property property in rep.Properties)
            {
                item = new ListViewItem();
                item.Text = property.Address;
                item.SubItems.Add(new ListViewItem.ListViewSubItem { Text = property.PropertyType });
                item.SubItems.Add(new ListViewItem.ListViewSubItem { Text = property.OwnerName });
                uxDetails.Items.Add(item);
            }
        }

        private void FormatProperty(object taggedObject)
        {
            Property property = (Property)taggedObject;

            //the list view will have 3 columns
            uxDetails.Columns.Clear();
            uxDetails.Columns.Add("Address", 200);
            uxDetails.Columns.Add("Property Type", 150);
            uxDetails.Columns.Add("Owner", 150);

            //add the items to the listview
            uxDetails.Items.Clear();
            ListViewItem item;
            item = new ListViewItem();
            item.Text = property.Address;
            item.SubItems.Add(new ListViewItem.ListViewSubItem { Text = property.PropertyType });
            item.SubItems.Add(new ListViewItem.ListViewSubItem { Text = property.OwnerName });
            uxDetails.Items.Add(item);
        }

        private void expandAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            uxTree.ExpandAll();
        }

        private void collapseAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            uxTree.CollapseAll();
        }
    }
}
---------------------------------------------------------------------------------------------
//FileAccessObject.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace CPRG253.RealEstate.Domain
{
    //This object handles the file access
    public class FileAccessObject
    {
        //set class variables to path to csv files
        const string CityFileName = "cities.csv";
        const string SalesRepFileName = "salesreps.csv";
        const string propertyFileName = "properties.csv";

        //only public method returns collection of city objects (bueach city contains nested collections)
        public static List<City> GetCities()
        {
            var cities = new List<City>();
            City city = null;

            //get the cities from the csv file as a string array
            var cityArray = File.ReadAllLines(CityFileName);

            //for each city csv record in file...
            foreach (string cityData in cityArray)
            {
                //...split the csv record by the comma into a string array
                var items = cityData.Split(',');
                //instantiate the city object with items from string array
                city = new City { Id = int.Parse(items[0]), Name = items[1] };
                //city = new City (items[0], items[1]);
                //pass the city object to another method to populate the sales rep for that city
                GetRepsByCity(city);
                //then add the city object to the collections that will be returned after this loop
                cities.Add(city);
            }

            return cities;
        }

        //This private method is responsible for populating the city object with the sales reps for that city
        private static void GetRepsByCity(City city)
        {
            var reps = new List<SalesRep>();
            SalesRep rep = null;

            //get salesreps from the csv file as a string array(one in each row in the file)
            var repArray = File.ReadAllLines(SalesRepFileName);

            //loop through each sales rep csv record in the string array
            foreach (string repData in repArray)
            {
                //split the csv record by the comma into a string array
                var items = repData.Split(',');
                //convert string id value from csv record to integer for testing value of city id
                int id = int.Parse(items[2]);

                //if we have a match...
                if(id == city.Id)
                {
                    //instantiate the Sales Rep with items from csv record
                    rep = new SalesRep { Id = int.Parse(items[0]), FullName = items[1], City = city };
                    //then pass the sales rep to the method that will populate the sales rep object with its properties
                    GetPropertiesBySalesRep(rep);
                    //then add sales rep to collection
                    reps.Add(rep);
                }
            }
            //the sales rep collection is then assigned to the sales rep property of the city object passed
            //in to this method
            city.SalesReps = reps;
        }

        //This private method populates the sales rep object with its properties
        private static void GetPropertiesBySalesRep(SalesRep rep)
        {
            var props = new List<Property>();
            Property prop = null;

            //get preoperties from the csv file as a string array
            var propArray = File.ReadAllLines(propertyFileName);

            //loop through the csv records
            foreach (string propData in propArray)
            {
                //split the csv record into a string array
                var items = propData.Split(',');
                //convert the string id value from csv record for testing of sales rep id
                int id = int.Parse(items[4]);
                //test to see if sales rep id of property matches the sales rep id passed in
                if (id == rep.Id)
                {
                    //if match, instantiate the property with items of csv record
                    prop = new Property { Id = int.Parse(items[0]), Address = items[1], PropertyType = items[2], OwnerName = items[3] };
                    //then assign sales rep object to sales rep property of property
                    prop.SalesRep = rep;
                    //then add property to collection
                    props.Add(prop);
                }
            }
            //then assign properties collection to properties property of he sales rep object passed in.
            rep.Properties = props;
        }

    }
}

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