■ Binding 태그 확장의 TargetNullValue 속성을 사용해 NULL 바인딩시 대체 값을 설정하는 방법을 보여준다.
▶ Employee.cs
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using System.ComponentModel; namespace TestProject; /// <summary> /// 직원 /// </summary> public class Employee : INotifyPropertyChanged { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 속성 변경시 이벤트 - PropertyChanged /// <summary> /// 속성 변경시 이벤트 /// </summary> public event PropertyChangedEventHandler PropertyChanged; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// ID /// </summary> private int id; /// <summary> /// 성명 /// </summary> private string name; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region ID - ID /// <summary> /// ID /// </summary> public int ID { get { return this.id; } set { if(this.id == value) { return; } this.id = value; FirePropertyChangedEvent(nameof(ID)); } } #endregion #region 성명 - Name /// <summary> /// 성명 /// </summary> public string Name { get { return this.name; } set { if(this.name == value) { return; } this.name = value; FirePropertyChangedEvent(nameof(Name)); } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 속성 변경시 이벤트 발생시키기 - FirePropertyChangedEvent(propertyName) /// <summary> /// 속성 변경시 이벤트 발생시키기 /// </summary> /// <param name="propertyName">속성명</param> protected void FirePropertyChangedEvent(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } #endregion } |
▶ MainPage.xaml
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<?xml version="1.0" encoding="utf-8" ?> <ContentPage x:Class="TestProject.MainPage" x:Name="page" xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:TestProject"> <ContentPage.BindingContext> <local:Employee ID="1" Name="{x:Null}" /> </ContentPage.BindingContext> <Grid HorizontalOptions="Center" VerticalOptions="Center"> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="10" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="10" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Label Grid.Row="0" Grid.Column="0" Text="ID" /> <Label Grid.Row="0" Grid.Column="2" Text="{Binding ID}" /> <Label Grid.Row="2" Grid.Column="0" Text="성명" /> <Label Grid.Row="2" Grid.Column="2" Text="{Binding Name, TargetNullValue=무명인}" /> </Grid> </ContentPage> |
