TreeView and WPF User Control in WPF

Vishal Gilbile
11y
23.5k
0
1

Article

This article demonstrates how to use a TreeView in WPF and how to program with it. As we all know, a TreeView basically is a control that displays data hierarchically. I'm not providing an extensive explanation. Let's move on towards our program.

Here we are going to display the Id's of all employees working under different projects. Employees are categorized as per their roles into the 4 categories Manager, Software Developer, Associate Consultant, Technical Lead etc. Working under different projects. For every project there will be only one project manager and randomly we will be adding different categories i.e. for every project, a random number of Technical Leads, Software Developers or Associate Consultant are added to every project since I'm not using any database. But in your case if you are using a database then there is no need to display the data the way I did. The Order Of displaying ID of employee should be in this format (Manager, Technical Lead, Associate Consultant, Software Developer). After all the ID of all employees working for different projects gets displayed in a TreeView control, the next phase is to display the data of that particular employee whose ID is selected from the TreeView control. For displaying the data of the employee we have tried to create a WPF user control that will at runtime fetch the data and display it on the screen. The snapshot for that is the following.

Note: kindly go through the code thoroughly. It might help you in your projects.

Ok now moving towards our source code.

Employee.cs (Database Of our program)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Collections.ObjectModel;

namespace WpfApplication3

{

internal class Employee

{

#region Enum Declaration

public enum Projects { FinanceDomain, HealthDomain, MedicalDomain };

public enum Roles { Manager = 0, SoftwareDev, TechnicalLead, AssociateConsultant };

public enum SexualCategory { Male, Female };

#endregion

#region Properties Declaration

public string ID { get; set; }

public string Name { get; set; }

public string Address { get; set; }

public SexualCategory Gender { get; set; }

public string Email { get; set; }

public Roles Designation { get; set; }

public Projects Project { get; set; }

public string ProfilePic { get; set; }

#endregion

public static ObservableCollection<Employee> GetAllEmployeeDetails()

{

//for randomly generate no's

Random rnd = new Random();

//Employee ID's of Employee

int[] ids = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };

//Name Of Employee

string[] names = { "Raj", "Vivek", "Siddhesh", "Raksha", "Rahul", "Priya", "Neetu", "Santosh", "Ronny", "Punit", "Krishna", "Lincy", "Wasim", "Kailash", "Vishnav" };

//Address Of Employee

string[] adds = { "Andheri", "Worli", "Dadar", "Bandra", "Chinchpokli" };

//Profile Pic Of Employee

string[] profilePics = { "./img/h1.jpg", "./img/lady.jpg" };

//Index Position Of Lady Employee For Eg. At Index 3 Raksha, At 5 Priya or 6 Neetu.

int[] ladyIndex = { 3, 5, 6, 11 };

ObservableCollection<Employee> objEmployee = new ObservableCollection<Employee>();

objEmployee.Add(new Employee()

{

ID = "M001",

Name = "Prakansha",

Address = "Andheri",

Email = "[email protected]",

Gender = SexualCategory.Female,

ProfilePic = profilePics[1],

Designation = Roles.Manager,// or GetProjectType<Roles>(Enum.GetName(typeof(Roles), Roles.Manager)),

Project = Projects.FinanceDomain

});

objEmployee.Add(new Employee()

{

ID = "M002",

Name = "Vishal",

Address = "Andheri",

Gender = SexualCategory.Male,

Email = "[email protected]",

ProfilePic = profilePics[0],

Designation = Roles.Manager,// or GetProjectType<Roles>(Enum.GetName(typeof(Roles), Roles.Manager)),

Project = Projects.HealthDomain

});

objEmployee.Add(new Employee()

{

ID = "M003",

Name = "Kanan",

Address = "Dadar",

Gender = SexualCategory.Male,

Email = "[email protected]",

ProfilePic = profilePics[0],

Designation = Roles.Manager,// or GetProjectType<Roles>(Enum.GetName(typeof(Roles), Roles.Manager)),

Project = Projects.MedicalDomain

});

for (int i = 0; i < ids.Length; i++)

{

if (i < 9)

objEmployee.Add(new Employee()

{

ID = string.Concat("E00", ids[i]),

Name = names[i],

Address = adds[rnd.Next(0, adds.Length - 1)],

Email = string.Concat(names[i], "@gmail.com"),

Gender = ladyIndex.Contains(i) == true ? SexualCategory.Female : SexualCategory.Male,

ProfilePic = ladyIndex.Contains(i) == true ? profilePics[1] : profilePics[0],

Designation = GetProjectType<Roles>(Enum.GetName(typeof(Roles), rnd.Next(1, Enum.GetValues(typeof(Roles)).Length))),

Project = GetProjectType<Projects>(Enum.GetName(typeof(Projects), rnd.Next(0, Enum.GetValues(typeof(Projects)).Length)))

});

else

objEmployee.Add(new Employee()

{

ID = string.Concat("E0", ids[i]),

Name = names[i],

Address = adds[rnd.Next(0, adds.Length - 1)],

Gender = ladyIndex.Contains(i) == true ? SexualCategory.Female : SexualCategory.Male,

Email = string.Concat(names[i], "@gmail.com"),

ProfilePic = ladyIndex.Contains(i) == true ? profilePics[1] : profilePics[0],

Designation = GetProjectType<Roles>(Enum.GetName(typeof(Roles), rnd.Next(1, Enum.GetValues(typeof(Roles)).Length))),

Project = GetProjectType<Projects>(Enum.GetName(typeof(Projects), rnd.Next(0, Enum.GetValues(typeof(Projects)).Length)))

});

}

return objEmployee;

}

/// <summary>

/// This function returns the values of Enums (Projects And Roles). It is a Generic Function.

/// </summary>

/// <typeparam name="T">Value of T can either be Projects or Roles</typeparam>

/// <param name="enumValue">Enum Value</param>

/// <returns>Value of T. It may be Projects or Roles.</returns>

private static T GetProjectType<T>(string enumValue)

{

T str;

int len = Enum.GetValues(typeof(T)).Length;

str = (T)Enum.Parse(typeof(T), enumValue, true);

return str;

}

}

WPF User control

Details.xaml

<UserControl x:Class="WpfApplication3.Details"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

mc:Ignorable="d" Height="270" Width="250" Loaded="UserControl_Loaded" Background="BlanchedAlmond">

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

</Grid>

</UserControl>

Details.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Collections.ObjectModel;

namespace WpfApplication3

{

/// <summary>

/// Interaction logic for Details.xaml

/// </summary>

public partial class Details : UserControl

{

public Details()

{

InitializeComponent();

}

private void UserControl_Loaded(object sender, RoutedEventArgs e)

{

}

/// <summary>

/// Processing the Record OF the Employee by dividing the value received as a parameter into column names and values

/// </summary>

/// <param name="str">String of colName and values separated by = and concatenate with | symbol.</param>

public void ProcessEmployeeDetails(string str)

{

string[] arr = str.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries);

string[] colNames = arr.Select(x => x.Substring(0, x.IndexOf('='))).ToArray<string>();

string[] colValues = arr.Select(x => x.Substring(x.IndexOf('=') + 1)).ToArray<string>();

CreateRows(colNames, colValues);

}

/// <summary>

/// This function will create rows at runtime based on the no of Column Names and Values.

/// </summary>

/// <param name="colNames">Column Names to be displayed on the Grid.</param>

/// <param name="colValues">Values to be displayed on the Grid.</param>

private void CreateRows(string[] colNames, string[] colValues)

{

myGrid.Children.Clear();

for (int i = 0; i < colValues.Length; i++)

{

if (i == 0)

{

RowDefinition row = new RowDefinition();

row.Height = new GridLength(120);

Image img = new Image();

img.Name = "profilePic";

img.Width = 100;

img.Height = 100;

img.SetValue(Grid.ColumnSpanProperty, 2);

img.Source = new BitmapImage(new Uri(colValues[i], UriKind.Relative));

Grid.SetRow(img, i);

Grid.SetColumn(img, 0);

myGrid.Children.Add(img);

myGrid.RowDefinitions.Add(row);

}

else

{

RowDefinition row = new RowDefinition();

row.Height = new GridLength(25);

myGrid.RowDefinitions.Add(row);

TextBlock tblHeaders = new TextBlock();

tblHeaders.Name = "tbl" + colNames[i];

tblHeaders.Text = colNames[i];

Grid.SetColumn(tblHeaders, 0);

Grid.SetRow(tblHeaders, i);

myGrid.Children.Add(tblHeaders);

TextBlock tblValues = new TextBlock();

tblValues.Name = "tbl";

tblValues.SetValue(TextBlock.FontWeightProperty, FontWeights.Bold);

tblValues.Text = colValues[i];

Grid.SetColumn(tblValues, 1);

Grid.SetRow(tblValues, i);

myGrid.Children.Add(tblValues);

}

MainWindow.xaml

<Window x:Class="WpfApplication3.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="clr-namespace:WpfApplication3"

Title="MainWindow" Height="315" Width="475" Loaded="Window_Loaded">

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

<local:Details x:Name="detailsPane" ScrollViewer.VerticalScrollBarVisibility="Auto" Margin="190,0,-11,12" Grid.ColumnSpan="2"></local:Details>

</Grid>

</Window>

MainWindow.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Collections.ObjectModel;

using System.Reflection;

namespace WpfApplication3

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

private ObservableCollection<Employee> objEmployee = new ObservableCollection<Employee>();

private TreeViewItem[] itemProjects;

private string[] projectHirearchy;

private void Window_Loaded(object sender, RoutedEventArgs e)

{

objEmployee = Employee.GetAllEmployeeDetails();

LoadAllEmployeIDInTreeView();

}

private void LoadAllEmployeIDInTreeView()

{

TreeViewItem item = null;

MemberInfo[] membersInfos = typeof(Employee.Projects).GetMembers(BindingFlags.Public | BindingFlags.Static);

itemProjects = new TreeViewItem[membersInfos.Length];

projectHirearchy = new string[membersInfos.Length];

int counter = 0;

foreach (MemberInfo mem in membersInfos)

{

itemProjects[counter] = new TreeViewItem();

itemProjects[counter].BorderThickness = new Thickness(5);

itemProjects[counter].BorderBrush = Brushes.Honeydew;

itemProjects[counter].Background = Brushes.LightSkyBlue;

itemProjects[counter].Foreground = Brushes.Black;

itemProjects[counter].FontFamily = new FontFamily("Times New Roman");

itemProjects[counter].FontSize = 15;

itemProjects[counter].SetValue(TreeViewItem.FontWeightProperty, FontWeights.UltraBold);

itemProjects[counter].Header = projectHirearchy[counter] = mem.Name;

treeView1.Items.Add(itemProjects[counter]);

counter++;

}

List<dynamic> displayRolesOrder = new List<dynamic>() { "Manager", "TechnicalLead", "AssociateConsultant", "SoftwareDev" };

List<dynamic> displayProjectOrder = new List<dynamic>() { "FinanceDomain", "HealthDomain", "MedicalDomain" };

var query = objEmployee.GroupBy

(

grp => new

{

Role = grp.Designation.ToString(),

Project = grp.Project.ToString(),

EID = grp.ID

})

.OrderBy(pro => displayRolesOrder.IndexOf(pro.Key.Project))

.ThenBy(des => displayRolesOrder.IndexOf(des.Key.Role));

foreach (var result in query)

{

item = new TreeViewItem();

item.Background = Brushes.LightBlue;

item.BorderThickness = new Thickness(2);

item.BorderBrush = Brushes.LightGoldenrodYellow;

item.Foreground = Brushes.Maroon;

item.FontFamily = new FontFamily("Verdana");

item.FontSize = 12;

item.Header = result.Key.EID.ToString();

AddToTreeView(item, result.Key.Project.ToString());

}

private void AddToTreeView(TreeViewItem treeitem, string projectName)

{

foreach (TreeViewItem item in itemProjects)

{

if (item.Header.Equals(projectName))

{

item.Items.Add(treeitem);

}

private void treeView1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)

{

string record = "";

TreeViewItem item = (TreeViewItem)treeView1.SelectedItem;

var query = from q in objEmployee

where q.ID == item.Header.ToString()

select q;

foreach (var result in query)

{

record = "ProfilePic=" + result.ProfilePic + "|" + "ID=" + result.ID + "|" + "Name=" + result.Name + "|" + "Email=" + result.Email + "|" + "Address=" +

result.Address + "|" + "Gender=" + result.Gender + "|" + "Designation=" + result.Designation + "|" + "Projects=" + result.Project;

}

detailsPane.ProcessEmployeeDetails(record);

}

The following is the output of it.

The Order of ID displayed is in the format of Manager, TechnicalLead, AssociateConsultant, SoftwareDev.

Points to see in App

Sorting is done for displaying the ID in the format (Manager, TechnicalLead, AssociateConsultant, SoftwareDev).
Use Of Reflections And Enums
Use Of Generic Function.
Power Of LINQ Queries.
And for beginners how to dynamically add rows to the Grid control in WPF.

Hope you all might have enjoyed the article and it may help you in your project. In case of any queries feel free to contact me.