■ ValidationRule 클래스를 사용해 바인딩 항목을 검증하는 방법을 보여준다.
▶ DateAndPriceRule.cs
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using System; using System.Globalization; using System.Windows.Controls; using System.Windows.Data; namespace TestProject { /// <summary> /// 일자/가격 규칙 /// </summary> public class DateAndPriceRule : ValidationRule { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 검증하기 - Validate(value, cultureInfo) /// <summary> /// 검증하기 /// </summary> /// <param name="value">값</param> /// <param name="cultureInfo">문화 정보</param> /// <returns>검증 결과</returns> public override ValidationResult Validate(object value, CultureInfo cultureInfo) { BindingGroup bindingGroup = value as BindingGroup; PurchaseItem item = bindingGroup?.Items[0] as PurchaseItem; object priceObject; object offerExpiresObject; bool priceResult = bindingGroup.TryGetValue(item, "Price" , out priceObject ); bool offerExpiresResult = bindingGroup.TryGetValue(item, "OfferExpires", out offerExpiresObject); if(!priceResult || !offerExpiresResult) { return new ValidationResult(false, "Properties not found"); } double price = (double)priceObject; DateTime offerExpires = (DateTime)offerExpiresObject; if(price > 100) { if(offerExpires < DateTime.Today + new TimeSpan(7, 0, 0, 0)) { return new ValidationResult(false, "Items over $100 must be available for at least 7 days."); } } return ValidationResult.ValidResult; } #endregion } } |
▶ FutureDateRule.cs
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using System; using System.Globalization; using System.Windows.Controls; namespace TestProject { /// <summary> /// 미래 일자 규칙 /// </summary> internal class FutureDateRule : ValidationRule { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 검증하기 - Validate(value, cultureInfo) /// <summary> /// 검증하기 /// </summary> /// <param name="value">값</param> /// <param name="cultureInfo">문화 정보</param> /// <returns>검증 결과</returns> public override ValidationResult Validate(object value, CultureInfo cultureInfo) { DateTime date; try { date = DateTime.Parse(value?.ToString()); } catch(FormatException) { return new ValidationResult(false, "Value is not a valid date."); } return DateTime.Now.Date > date ? new ValidationResult(false, "Please enter a date in the future.") : ValidationResult.ValidResult; } #endregion } } |
▶ PositivePriceRule.cs
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using System; using System.Globalization; using System.Windows.Controls; namespace TestProject { /// <summary> /// 양수 가격 규칙 /// </summary> public class PositivePriceRule : ValidationRule { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 검증하기 - Validate(value, cultureInfo) /// <summary> /// 검증하기 /// </summary> /// <param name="value">값</param> /// <param name="cultureInfo">문화 정보</param> /// <returns>검증 결과</returns> public override ValidationResult Validate(object value, CultureInfo cultureInfo) { try { double price = Convert.ToDouble(value); if(price < 0) { return new ValidationResult(false, "Price must be positive."); } return ValidationResult.ValidResult; } catch(Exception) { return new ValidationResult(false, "Price must be a number."); } } #endregion } } |
▶ PurchaseItem.cs
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using System; using System.ComponentModel; namespace TestProject { /// <summary> /// 구매 항목 /// </summary> public class PurchaseItem : INotifyPropertyChanged, IEditableObject { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 속성 변경시 - PropertyChanged /// <summary> /// 속성 변경시 /// </summary> public event PropertyChangedEventHandler PropertyChanged; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Struct ////////////////////////////////////////////////////////////////////////////////////////// Private #region 항목 데이터 - ItemData /// <summary> /// 항목 데이터 /// </summary> private struct ItemData { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Internal #region Field /// <summary> /// 설명 /// </summary> internal string Description; /// <summary> /// 제안 만기일 /// </summary> internal DateTime OfferExpires; /// <summary> /// 가격 /// </summary> internal double Price; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Internal #region 새 항목 구하기 - GetNewItem() /// <summary> /// 새 항목 구하기 /// </summary> /// <returns>새 항목</returns> internal static ItemData GetNewItem() { ItemData data = new ItemData { Description = "New item", Price = 0, OfferExpires = DateTime.Now + new TimeSpan(7, 0, 0, 0) }; return data; } #endregion } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 복사 데이터 /// </summary> private ItemData copyData = ItemData.GetNewItem(); /// <summary> /// 현대 데이터 /// </summary> private ItemData currentData = ItemData.GetNewItem(); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 설명 - Description /// <summary> /// 설명 /// </summary> public string Description { get { return this.currentData.Description; } set { if(this.currentData.Description != value) { this.currentData.Description = value; FirePropertyChangedEvent("Description"); } } } #endregion #region 가격 - Price /// <summary> /// 가격 /// </summary> public double Price { get { return this.currentData.Price; } set { if(this.currentData.Price != value) { this.currentData.Price = value; FirePropertyChangedEvent("Price"); } } } #endregion #region 제안 만기일 - OfferExpires /// <summary> /// 제안 만기일 /// </summary> public DateTime OfferExpires { get { return this.currentData.OfferExpires; } set { if(value != this.currentData.OfferExpires) { this.currentData.OfferExpires = value; FirePropertyChangedEvent("OfferExpires"); } } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - PurchaseItem() /// <summary> /// 생성자 /// </summary> public PurchaseItem() { } #endregion #region 생성자 - PurchaseItem(description, price, offerExpires) /// <summary> /// 생성자 /// </summary> /// <param name="description">설명</param> /// <param name="price">가격</param> /// <param name="offerExpires">제안 만기일</param> public PurchaseItem(string description, double price, DateTime offerExpires) { Description = description; Price = price; OfferExpires = offerExpires; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 편집 시작하기 - BeginEdit() /// <summary> /// 편집 시작하기 /// </summary> public void BeginEdit() { this.copyData = this.currentData; } #endregion #region 편집 취소하기 - CancelEdit() /// <summary> /// 편집 취소하기 /// </summary> public void CancelEdit() { this.currentData = this.copyData; FirePropertyChangedEvent(""); } #endregion #region 편집 종료하기 - EndEdit() /// <summary> /// 편집 종료하기 /// </summary> public void EndEdit() { this.copyData = ItemData.GetNewItem(); } #endregion #region 문자열 구하기 - ToString() /// <summary> /// 문자열 구하기 /// </summary> /// <returns>문자열</returns> public override string ToString() => $"{Description}, {Price:c}, {OfferExpires:D}"; #endregion ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 속성 변경시 이벤트 발생시키기 - FirePropertyChangedEvent(propertyName) /// <summary> /// 속성 변경시 이벤트 발생시키기 /// </summary> /// <param name="propertyName">속성명</param> private void FirePropertyChangedEvent(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } #endregion } } |
▶ MainWindow.xaml
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<Window x:Class="TestProject.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TestProject" Width="800" Height="600" Title="TestProject" FontFamily="나눔고딕코딩" FontSize="16"> <StackPanel Name="stackPanel" Margin="10" Validation.Error="stackPanel_ValidationError"> <StackPanel.Resources> <Style TargetType="HeaderedContentControl"> <Setter Property="Margin" Value="10" /> <Setter Property="Focusable" Value="False" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="HeaderedContentControl"> <DockPanel LastChildFill="False"> <ContentPresenter DockPanel.Dock="Left" VerticalAlignment="Center" Focusable="False" ContentSource="Header" /> <ContentPresenter DockPanel.Dock="Right" VerticalAlignment="Center" Margin="10 0 0 0" ContentSource="Content" /> </DockPanel> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="Button"> <Setter Property="Margin" Value="10" /> <Setter Property="Width" Value="100"/> <Setter Property="Height" Value="30" /> </Style> </StackPanel.Resources> <StackPanel.BindingGroup> <BindingGroup NotifyOnValidationError="True"> <BindingGroup.ValidationRules> <local:DateAndPriceRule ValidationStep="ConvertedProposedValue" /> </BindingGroup.ValidationRules> </BindingGroup> </StackPanel.BindingGroup> <TextBlock Margin="10" TextWrapping="Wrap"> This sample demonstrates how to validate an object by checking multiple properties in a ValidationRule. When a ValidationRule is added to a BindingGroup, the rule can get the properties of the source item in the Validate method. <LineBreak/><LineBreak/> This sample checks that if an item costs more than 100 dollars, the item is available for at least 7 days. </TextBlock> <TextBlock Margin="10" FontWeight="Bold" Text="Enter an item for sale" /> <HeaderedContentControl Header="Description"> <TextBox Width="150" Text="{Binding Path=Description, Mode=TwoWay}" /> </HeaderedContentControl> <HeaderedContentControl Header="Price"> <TextBox Width="150"> <TextBox.Text> <Binding Path="Price" Mode="TwoWay" > <Binding.ValidationRules> <local:PositivePriceRule /> </Binding.ValidationRules> </Binding> </TextBox.Text> </TextBox> </HeaderedContentControl> <HeaderedContentControl Header="Date Offer Ends"> <TextBox Width="150" > <TextBox.Text> <Binding Path="OfferExpires" StringFormat="d"> <Binding.ValidationRules> <local:FutureDateRule /> </Binding.ValidationRules> </Binding> </TextBox.Text> </TextBox> </HeaderedContentControl> <StackPanel Orientation="Horizontal"> <Button Name="submitButton" IsDefault="True"> _Submit </Button> <Button Name="cancelButton" IsCancel="True"> _Cancel </Button> </StackPanel> <HeaderedContentControl Header="Description"> <TextBlock Width="150" Text="{Binding Path=Description}" /> </HeaderedContentControl> <HeaderedContentControl Header="Price"> <TextBlock Width="150" Text="{Binding Path=Price, StringFormat=c}" /> </HeaderedContentControl> <HeaderedContentControl Header="Date Offer Ends"> <TextBlock Width="150" Text="{Binding Path=OfferExpires, StringFormat=d}" /> </HeaderedContentControl> </StackPanel> </Window> |
▶ MainWindow.xaml.cs
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using System.Windows; using System.Windows.Controls; namespace TestProject { /// <summary> /// 메인 윈도우 /// </summary> public partial class MainWindow : Window { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainWindow() /// <summary> /// 생성자 /// </summary> public MainWindow() { InitializeComponent(); this.stackPanel.Loaded += stackPanel_Loaded; this.submitButton.Click += submitButton_Click; this.cancelButton.Click += cancelButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 스택 패널 로드시 처리하기 - stackPanel_Loaded(sender, e) /// <summary> /// 스택 패널 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void stackPanel_Loaded(object sender, RoutedEventArgs e) { this.stackPanel.DataContext = new PurchaseItem(); this.stackPanel.BindingGroup.BeginEdit(); } #endregion #region 스택 패널 검증시 에러 처리하기 - stackPanel_ValidationError(sender, e) /// <summary> /// 스택 패널 검증시 에러 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void stackPanel_ValidationError(object sender, ValidationErrorEventArgs e) { if(e.Action == ValidationErrorEventAction.Added) { MessageBox.Show(e.Error.ErrorContent.ToString()); } } #endregion #region Submit 버튼 클릭시 처리하기 - submitButton_Click(sender, e) /// <summary> /// Submit 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void submitButton_Click(object sender, RoutedEventArgs e) { if(this.stackPanel.BindingGroup.CommitEdit()) { MessageBox.Show("Item submitted"); this.stackPanel.BindingGroup.BeginEdit(); } } #endregion #region Cancel 버튼 클릭시 처리하기 - cancelButton_Click(sender, e) /// <summary> /// Cancel 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void cancelButton_Click(object sender, RoutedEventArgs e) { this.stackPanel.BindingGroup.CancelEdit(); this.stackPanel.BindingGroup.BeginEdit(); } #endregion } } |
