WPF 데이터바인딩 심플예제, INotifyPropertyChanged 인터페이스를 이용한 데이터 바인딩 예제,PropertyChanged 이벤트

WPF 데이터바인딩 심플예제, INotifyPropertyChanged 인터페이스를 이용한 데이터 바인딩 예제,PropertyChanged 이벤트

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n INotifyPropertyChanged 인터페이스는 속성 값이 변경되면 클라이언트에 알리는 데 사용된다. INotifyPropertyChanged 인터페이스에는 PropertyChanged라는 이벤트가 포함되어 있는데 ViewModel / Model 개체의 속성이 변경되면 PropertyChanged 이벤트를 발생시켜 WPF 바인딩 시스템에 새 값을 알려준다.

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n INotifyTest 라는 이름으로 WPF 프로젝트 생성

n Person.cs

using System.ComponentModel; namespace INotifyTest{ public class Person : INotifyPropertyChanged { private string name; // Declare the event public event PropertyChangedEventHandler PropertyChanged; public Person() { } public Person(string value) { this.name = value; } public string PersonName { get { return name; } set { name = value; // Call OnPropertyChanged whenever the property is updated OnPropertyChanged("PersonName"); } } // Create the OnPropertyChanged method to raise the event protected void OnPropertyChanged(string name) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name)); } } }

n MainWindow.xaml

<Window x:Class="INotifyTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:INotifyTest" xmlns:src="clr-namespace:INotifyTest" mc:Ignorable="d" Title="MainWindow" Height="350" Width="525"> <!--<SnippetBindingSource>--> <Window.Resources> <src:Person x:Key="myDataSource" PersonName="홍길동"/> <!--</SnippetInstantiation>--> <Style TargetType="{x:Type Label}"> <Setter Property="DockPanel.Dock" Value="Top"/> <Setter Property="FontSize" Value="12"/> </Style> <Style TargetType="{x:Type TextBox}"> <Setter Property="Width" Value="100"/> <Setter Property="Height" Value="25"/> <Setter Property="DockPanel.Dock" Value="Top"/> </Style> <Style TargetType="{x:Type TextBlock}"> <Setter Property="Width" Value="100"/> <Setter Property="Height" Value="25"/> <Setter Property="DockPanel.Dock" Value="Top"/> <Setter Property="Padding" Value="3"/> </Style> <!--<Snippet2>--> </Window.Resources> <!--</Snippet2>--> <Border Margin="5" BorderBrush="Aqua" BorderThickness="1" Padding="8" CornerRadius="3"> <DockPanel Width="200" Height="100" Margin="35"> <!-- <Snippet1> --> <Label>Enter a Name:</Label> <TextBox> <TextBox.Text> <Binding Source="{StaticResource myDataSource}" Path="PersonName" UpdateSourceTrigger="PropertyChanged"/> </TextBox.Text> </TextBox> <!-- </Snippet1> --> <!--</SnippetBindingSource>--> <Label>The name you entered:</Label> <!--<SnippetBDO1>--> <TextBlock Text="{Binding Source={StaticResource myDataSource}, Path=PersonName}"/> <!--</SnippetBDO1>--> </DockPanel> </Border> <!--<SnippetEndWindow>--> </Window>

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