1 using System;  2 using System.Collections.Generic;  3 using System.ComponentModel;  4 using System.Drawing;  5 using System.Runtime.CompilerServices;  6 using System.Windows.Forms;  7   8 // Change the namespace to the project name.  9 namespace TestNotifyPropertyChangedCS 10 { 11     // This form demonstrates using a BindingSource to bind 12     // a list to a DataGridView control. The list does not 13     // raise change notifications. However the DemoCustomer type  14     // in the list does. 15     public partial class Form1 : Form 16     { 17         // This button causes the value of a list element to be changed. 18         private Button changeItemBtn = new Button(); 19  20         // This DataGridView control displays the contents of the list. 21         private DataGridView customersDataGridView = new DataGridView(); 22  23         // This BindingSource binds the list to the DataGridView control. 24         private BindingSource customersBindingSource = new BindingSource(); 25  26         public Form1() 27         { 28             InitializeComponent(); 29  30             // Set up the "Change Item" button. 31             this.changeItemBtn.Text = "Change Item"; 32             this.changeItemBtn.Dock = DockStyle.Bottom; 33             this.changeItemBtn.Click += 34                 new EventHandler(changeItemBtn_Click); 35             this.Controls.Add(this.changeItemBtn); 36  37             // Set up the DataGridView. 38             customersDataGridView.Dock = DockStyle.Top; 39             this.Controls.Add(customersDataGridView); 40  41             this.Size = new Size(400, 200); 42         } 43  44         private void Form1_Load(object sender, EventArgs e) 45         { 46             // Create and populate the list of DemoCustomer objects 47             // which will supply data to the DataGridView. 48             BindingList
    
      customerList = new BindingList
     
      (); 49             customerList.Add(DemoCustomer.CreateNewCustomer()); 50             customerList.Add(DemoCustomer.CreateNewCustomer()); 51             customerList.Add(DemoCustomer.CreateNewCustomer()); 52  53             // Bind the list to the BindingSource. 54             this.customersBindingSource.DataSource = customerList; 55  56             // Attach the BindingSource to the DataGridView. 57             this.customersDataGridView.DataSource = 58                 this.customersBindingSource; 59  60         } 61  62         // Change the value of the CompanyName property for the first  63         // item in the list when the "Change Item" button is clicked. 64         void changeItemBtn_Click(object sender, EventArgs e) 65         { 66             // Get a reference to the list from the BindingSource. 67             BindingList
      
        customerList = 68                 this.customersBindingSource.DataSource as BindingList
       
        ; 69  70             // Change the value of the CompanyName property for the  71             // first item in the list. 72             customerList[0].CustomerName = "Tailspin Toys"; 73             customerList[0].PhoneNumber = "(708)555-0150"; 74         } 75  76     } 77  78     // This is a simple customer class that  79     // implements the IPropertyChange interface. 80     public class DemoCustomer : INotifyPropertyChanged 81     { 82         // These fields hold the values for the public properties. 83         private Guid idValue = Guid.NewGuid(); 84         private string customerNameValue = String.Empty; 85         private string phoneNumberValue = String.Empty; 86  87         public event PropertyChangedEventHandler PropertyChanged; 88  89         // This method is called by the Set accessor of each property. 90         // The CallerMemberName attribute that is applied to the optional propertyName 91         // parameter causes the property name of the caller to be substituted as an argument. 92         private void NotifyPropertyChanged([CallerMemberName] String propertyName = "") 93         { 94             if (PropertyChanged != null) 95             { 96                 PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 97             } 98         } 99 100         // The constructor is private to enforce the factory pattern.101         private DemoCustomer()102         {103             customerNameValue = "Customer";104             phoneNumberValue = "(312)555-0100";105         }106 107         // This is the public factory method.108         public static DemoCustomer CreateNewCustomer()109         {110             return new DemoCustomer();111         }112 113         // This property represents an ID, suitable114         // for use as a primary key in a database.115         public Guid ID116         {117             get118             {119                 return this.idValue;120             }121         }122 123         public string CustomerName124         {125             get126             {127                 return this.customerNameValue;128             }129 130             set131             {132                 if (value != this.customerNameValue)133                 {134                     this.customerNameValue = value;135                     NotifyPropertyChanged();136                 }137             }138         }139 140         public string PhoneNumber141         {142             get143             {144                 return this.phoneNumberValue;145             }146 147             set148             {149                 if (value != this.phoneNumberValue)150                 {151                     this.phoneNumberValue = value;152                     NotifyPropertyChanged();153                 }154             }155         }156     }157 }