回答編集履歴
2
ThemeMode
test
CHANGED
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@@ -125,7 +125,8 @@
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125
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:Qo1g4oys53jcubr"
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Width="525"
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-
Height="350"
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128
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Height="350"
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ThemeMode="System">
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<Window.DataContext>
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<local:MainWindowViewModel />
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</Window.DataContext>
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1
真面目に実装
test
CHANGED
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@@ -104,5 +104,108 @@
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104
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[MVVM Toolkit の概要 - Community Toolkits for .NET | Microsoft Learn](https://learn.microsoft.com/ja-jp/dotnet/communitytoolkit/mvvm/)
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105
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107
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108
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-
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107
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---
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108
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109
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> 年齢を入力するTextBoxの下にエラーメッセージ表示用のLabelをVisibility="Collapsed"にしてエラーが発生したらVisibility="Visible"にすればうまくいく
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110
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111
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をxamlで愚直に実装しました。
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112
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`TextBox`分用意しなくてはならず`ValidationAdornerSite`の設定も面倒なので、１，２個までかなぁという気はします（`TextBox`の`Template`をいじるよりはマシかｗ
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[Validation.ValidationAdornerSite 添付プロパティ (System.Windows.Controls) | Microsoft Learn](https://learn.microsoft.com/ja-jp/dotnet/api/system.windows.controls.validation.validationadornersite)
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[Validation.ValidationAdornerSiteFor 添付プロパティ (System.Windows.Controls) | Microsoft Learn](https://learn.microsoft.com/ja-jp/dotnet/api/system.windows.controls.validation.validationadornersitefor)
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[Nine Works 例外を利用したデータ検証](http://nineworks2.blog.fc2.com/blog-entry-19.html)
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117
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118
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厳密にやるなら複数エラーにも対応すべきでしょう。
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[WPFでの入力値検証・その6 ～複数のエラー表示への対応～ - SourceChord](https://sourcechord.hatenablog.com/entry/2014/10/20/004439)
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121
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```xml
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<Window
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x:Class="Qo1g4oys53jcubr.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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125
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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126
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xmlns:local="clr-namespace:Qo1g4oys53jcubr"
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Width="525"
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128
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Height="350">
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<Window.DataContext>
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<local:MainWindowViewModel />
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</Window.DataContext>
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<Window.Resources>
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<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
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<Style x:Key="ErrorStyle" TargetType="{x:Type ItemsControl}">
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<Setter Property="Validation.ErrorTemplate" Value="{x:Null}" />
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<Setter Property="ItemsSource" Value="{Binding (Validation.ValidationAdornerSiteFor).(Validation.Errors), RelativeSource={RelativeSource Self}}" />
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<Setter Property="Visibility" Value="{Binding (Validation.ValidationAdornerSiteFor).(Validation.HasError), Converter={StaticResource BooleanToVisibilityConverter}, RelativeSource={RelativeSource Self}}" />
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<Setter Property="ItemTemplate">
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<Setter.Value>
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<DataTemplate>
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<BulletDecorator TextBlock.Foreground="Red">
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<BulletDecorator.Bullet>
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<TextBlock Text="! " />
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</BulletDecorator.Bullet>
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<TextBlock Text="{Binding ErrorContent}" TextWrapping="Wrap" />
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</BulletDecorator>
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</DataTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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</Window.Resources>
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<Grid>
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="Auto" />
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<ColumnDefinition />
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</Grid.ColumnDefinitions>
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<Grid.RowDefinitions>
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<RowDefinition Height="auto" />
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<RowDefinition Height="auto" />
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</Grid.RowDefinitions>
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<Label Content="年齢" />
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<StackPanel Grid.Column="1">
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<TextBox
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Text="{Binding InputString, UpdateSourceTrigger=PropertyChanged}"
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Validation.ErrorTemplate="{x:Null}"
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Validation.ValidationAdornerSite="{Binding ElementName=inputStringError}" />
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<ItemsControl x:Name="inputStringError" Style="{StaticResource ErrorStyle}" />
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</StackPanel>
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<Label Grid.Row="1" Content="出身地" />
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<StackPanel Grid.Row="1" Grid.Column="1">
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<TextBox
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Text="{Binding Area, UpdateSourceTrigger=PropertyChanged}"
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Validation.ErrorTemplate="{x:Null}"
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Validation.ValidationAdornerSite="{Binding ElementName=areaError}" />
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<ItemsControl x:Name="areaError" Style="{StaticResource ErrorStyle}" />
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</StackPanel>
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</Grid>
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</Window>
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```
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```cs
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using System.ComponentModel.DataAnnotations;
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using System.Windows;
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using CommunityToolkit.Mvvm.ComponentModel;
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namespace Qo1g4oys53jcubr;
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public partial class MainWindow : Window
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{
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public MainWindow() => InitializeComponent();
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}
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public partial class MainWindowViewModel : ObservableValidator
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{
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[ObservableProperty, NotifyDataErrorInfo]
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[Required(ErrorMessage = "何か入力してください")]
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[StringLength(10, ErrorMessage = "10文字以内で入力してください\naaaaaa")]
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[RegularExpression("[a-z]+", ErrorMessage = "a-zの文字列を入力してください")]
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private string? inputString;
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[ObservableProperty, NotifyDataErrorInfo]
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[Required(ErrorMessage = "何か入力してください")]
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private string? area;
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}
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```
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