■ Behavior<T> 클래스를 사용해 실수 값 검증 동작을 만드는 방법을 보여준다.
▶ NumericValidationBehavior.cs
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namespace TestProject; /// <summary> /// 숫자 검증 동작 /// </summary> public class NumericValidationBehavior : Behavior<Entry> { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 부착시 처리하기 - OnAttachedTo(entry) /// <summary> /// 부착시 처리하기 /// </summary> /// <param name="entry">엔트리</param> protected override void OnAttachedTo(Entry entry) { entry.TextChanged += entry_TextChanged; base.OnAttachedTo(entry); } #endregion #region 탈착시 처리하기 - OnDetachingFrom(entry) /// <summary> /// 탈착시 처리하기 /// </summary> /// <param name="entry">엔트리</param> protected override void OnDetachingFrom(Entry entry) { entry.TextChanged -= entry_TextChanged; base.OnDetachingFrom(entry); } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Private #region 엔트리 텍스트 변경시 처리하기 - entry_TextChanged(sender, e) /// <summary> /// 엔트리 텍스트 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void entry_TextChanged(object sender, TextChangedEventArgs e) { double result; bool isValid = double.TryParse(e.NewTextValue, out result); ((Entry)sender).TextColor = isValid ? Colors.Black : Colors.Red; } #endregion } |
▶ MainPage.xaml
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<?xml version="1.0" encoding="utf-8" ?> <ContentPage x:Class="TestProject.MainPage" xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:TestProject"> <Entry HorizontalOptions="Center" VerticalOptions="Center" WidthRequest="200" Placeholder="실수 값을 입력해 주시기 바랍니다."> <Entry.Behaviors> <local:NumericValidationBehavior /> </Entry.Behaviors> </Entry> </ContentPage> |
