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エンティティをデータベースに保存する前に、いくつかのプロパティを検証する必要があります。tabcontrol tabitemによるテキストボックス検証の変更方法
問題：
- Programmstart：Tabitem2を見るに
- ユーザーを選択します：Tabitem1を見る
- 検証エラーの中で検証エラーが
- ユーザーが選択tabitem1にテキストボックスを示しています空のテキストボックスは、もはやtabitem1には表示されません。
除外行動：ユーザーが選択したのTabItemを変更した場合
検証エラーも毎回示さなければなりません。使用
ツール/フレームワーク：Templatepack PrismUnity
質問と
- プリズム6.3（新規プロジェクト：
- 異なるタブアイテム間の選択後にDataAnnoationが表示されないのはなぜですか？ ViewModelプロパティhasErrorsがtrueです。
- ユーザーがtabitem1を再度選択した場合、どのように評価を再開できますか？
ビュー：
<Window x:Class="PrismUnityApp1TestValidation.Views.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:prism="http://prismlibrary.com/" prism:ViewModelLocator.AutoWireViewModel="True" Title="{Binding Title}" Height="350" Width="525"> <StackPanel> <!--<ContentControl prism:RegionManager.RegionName="ContentRegion" />--> <TabControl> <TabItem> <TabItem.Content> <TextBox Height="50" Text="{Binding TestText, ValidatesOnDataErrors=True, NotifyOnValidationError=True, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"></TextBox> </TabItem.Content> </TabItem> <TabItem> <TabItem.Content> <TextBlock Text="TabItem2"></TextBlock> </TabItem.Content> </TabItem> </TabControl> </StackPanel> </Window>のViewModel：
using System.ComponentModel.DataAnnotations; using Prism.Mvvm; using Prism.Validation; namespace PrismUnityApp1TestValidation.ViewModels { public class MainWindowViewModel : ValidatableBindableBase { private string _title = "Prism Unity Application"; public string Title { get { return _title; } set { SetProperty(ref _title, value); } } private string _testtext; [Required] public string TestText { get { return _testtext; } set { SetProperty(ref _testtext, value); } } public MainWindowViewModel() { } } }ValidatableBindableBase（NugetPackage Prism.Validation）：
namespace Prism.Validation { /// <summary> /// The IValidatableBindableBase interface was created to add validation support for model classes that contain validation rules. /// The default implementation of IValidatableBindableBase is the ValidatableBindableBase class, which contains the logic to run the validation rules of the /// instance of a model class and return the results of this validation as a list of properties' errors. /// </summary> // Documentation on validating user input is at http://go.microsoft.com/fwlink/?LinkID=288817&clcid=0x409 public class ValidatableBindableBase : BindableBase, IValidatableBindableBase, INotifyDataErrorInfo { private readonly BindableValidator _bindableValidator; /// <summary> /// Initializes a new instance of the <see cref="ValidatableBindableBase"/> class. /// </summary> public ValidatableBindableBase() { _bindableValidator = new BindableValidator(this); } /// <summary> /// Gets or sets a value indicating whether this instance is validation enabled. /// </summary> /// <value> /// <c>true</c> if validation is enabled for this instance; otherwise, <c>false</c>. /// </value> public bool IsValidationEnabled { get { return _bindableValidator.IsValidationEnabled; } set { _bindableValidator.IsValidationEnabled = value; } } /// <summary> /// Returns the BindableValidator instance that has an indexer property. /// </summary> /// <value> /// The Bindable Validator Indexer property. /// </value> public BindableValidator Errors { get { return _bindableValidator; } } /// <summary> /// Gets a value that indicates whether the entity has validation errors. /// </summary> /// <value> /// <c>true</c> if this instance contains validation errors; otherwise, <c>false</c>. /// </value> public bool HasErrors { get { return !ValidateProperties(); } } /// <summary> /// Occurs when the Errors collection changed because new errors were added or old errors were fixed. /// </summary> public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged { add { _bindableValidator.ErrorsChanged += value; } remove { _bindableValidator.ErrorsChanged -= value; } } /// <summary> /// Gets all errors. /// </summary> /// <returns> A ReadOnlyDictionary that's key is a property name and the value is a ReadOnlyCollection of the error strings.</returns> public ReadOnlyDictionary<string, ReadOnlyCollection<string>> GetAllErrors() { return _bindableValidator.GetAllErrors(); } /// <summary> /// Validates the properties of the current instance. /// </summary> /// <returns> /// Returns <c>true</c> if all properties pass the validation rules; otherwise, false. /// </returns> public bool ValidateProperties() { return _bindableValidator.ValidateProperties(); } /// <summary> /// Validates a single property with the given name of the current instance. /// </summary> /// <param name="propertyName">The property to be validated.</param> /// <returns>Returns <c>true</c> if the property passes the validation rules; otherwise, false.</returns> public bool ValidateProperty(string propertyName) { return !_bindableValidator.IsValidationEnabled // don't fail if validation is disabled || _bindableValidator.ValidateProperty(propertyName); } /// <summary> /// Sets the error collection of this instance. /// </summary> /// <param name="entityErrors">The entity errors.</param> public void SetAllErrors(IDictionary<string, ReadOnlyCollection<string>> entityErrors) { _bindableValidator.SetAllErrors(entityErrors); } /// <summary> /// Checks if a property already matches a desired value. Sets the property and /// notifies listeners only when necessary. We are overriding this property to ensure that the SetProperty and the ValidateProperty methods are fired in a /// deterministic way. /// </summary> /// <typeparam name="T">Type of the property.</typeparam> /// <param name="storage">Reference to a property with both getter and setter.</param> /// <param name="value">Desired value for the property.</param> /// <param name="propertyName">Name of the property used to notify listeners. This /// value is optional and can be provided automatically when invoked from compilers that /// support CallerMemberName.</param> /// <returns> /// True if the value was changed, false if the existing value matched the /// desired value. /// </returns> protected override bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null) { var result = base.SetProperty(ref storage, value, propertyName); if (result && !string.IsNullOrEmpty(propertyName)) { if (_bindableValidator.IsValidationEnabled) { _bindableValidator.ValidateProperty(propertyName); } } return result; } /// <summary> /// Gets the validation errors for a specified property or for the entire entity. /// </summary> /// <param name="propertyName">The name of the property to retrieve validation errors for; or null or Empty, to retrieve entity-level errors.</param> /// <returns>The validation errors for the property or entity.</returns> public IEnumerable GetErrors(string propertyName) { if (HasErrors==false) { return Enumerable.Empty<String>(); } return _bindableValidator[propertyName]; } } }