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我需要帮助实现 INotifyDataErrorInfo 接口，其中 SfTextBoxEx 放置在 SfTextInputLayout 中。

WPF 与 MVVM 使用 Caliburn.Micro 框架。

请找到以下项目结构以按问题理解。

1) 文件夹名称：基础结构文件：ValidatedPropertyChangedBase.cs

-- 它包含 INotifyDataErrorInfo 的实现。

2) FolderName : Model File : TestModel.cs -- 包含两个继承自 ValidatedPropertyChangedBase 的属性 -- 还包含使用 FluentValidation 验证属性的类

4) FolderName : View File : HomeView.xaml -- 带有两个 SfTextInputLayout 和 SfTextBoxExt 的标准窗口

4) FolderName : ViewModel File : HomeViewModel.cs -- 标准视图模型，模型作为属性，验证触发。--在这里，如果我在验证方法上设置断点，我可以看到返回的错误是正确的，但它不会触发 UI 以显示错误消息。--在将属性与文本框绑定时，我已经设置了 ValidatesOnNotifyDataError=true。

如果有问题，请检查并指导我。注意：我正在使用同步融合控件，但我也尝试使用标准文本框，它不会触发 errorchanged 事件。

我还使用了来自以下网址的 IntoifyDataError 实现：https ://www.thetechgrandma.com/2017/05/wpf-prism-inotifydataerrorinfo-and.html

--ValidatedPropertyChangedBase

public abstract class ValidatedPropertyChangedBase : PropertyChangedBase, INotifyDataErrorInfo
{
    private readonly Dictionary<string, List<string>> _errors = new Dictionary<string, List<string>>();

    


    public void SetError(string propertyName, string errorMessage)
    {
        if (!_errors.ContainsKey(propertyName))
            _errors.Add(propertyName, new List<string> { errorMessage });

        RaiseErrorsChanged(propertyName);
    }

    protected void ClearError(string propertyName)
    {
        if (_errors.ContainsKey(propertyName))
            _errors.Remove(propertyName);

        RaiseErrorsChanged(propertyName);
    }

    protected void ClearAllErrors()
    {
        var errors = _errors.Select(error => error.Key).ToList();

        foreach (var propertyName in errors)
            ClearError(propertyName);
    }
    public void RaiseErrorsChanged(string propertyName)
    {
        ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
    }

    public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged = delegate { return; };


    public bool HasErrors
    {
        get { return _errors.Any(x => x.Value != null && x.Value.Count > 0); }
    }
    public IEnumerable GetErrors(string propertyName)
    {
        if (String.IsNullOrEmpty(propertyName) ||
           !_errors.ContainsKey(propertyName)) return null;
        return _errors[propertyName];
    }

}

--ViewModel

public class HomeViewModel : ValidatedPropertyChangedBase
{

    private TestModel _model;
    public TestModel Model
    {
        get { return _model; }
        set
        {
            if (_model != value)
            {
                _model = value;
                NotifyOfPropertyChange(() => Model);
            }
        }
    }

    public HomeViewModel()
    {
        Model = new TestModel();
    }

    public void ValidateData()
    {
        ClearAllErrors();
        var validator = new TestModelValidation();
        FluentValidation.Results.ValidationResult result = validator.Validate(Model);
        foreach (var error in result.Errors)
        {
            SetError(error.PropertyName, error.ErrorMessage);
        }

        if (result.IsValid)
        {
            MessageBox.Show("Data good to save !");
        }

    }
}

- 看法

<Window
x:Class="ValidationDemo.Views.HomeView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:convertor="clr-namespace:ValidationDemo.Infrastructure"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:ValidationDemo.Views"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:sf="http://schemas.syncfusion.com/wpf"
Title="HomeView"
Width="800"
Height="450"
mc:Ignorable="d">
<Window.Resources>
    <Style
        TargetType="sf:SfTextInputLayout">
        <Setter Property="Width" Value="200" />
    </Style>
</Window.Resources>
<StackPanel
    HorizontalAlignment="Center"
    VerticalAlignment="Center"
    Orientation="Vertical">
    <sf:SfTextInputLayout
        Hint="First Name">
        <sf:SfTextBoxExt
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    </sf:SfTextInputLayout>
    <sf:SfTextInputLayout
        Hint="Last Name">
        <sf:SfTextBoxExt
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    </sf:SfTextInputLayout>
    <TextBox
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    <TextBox
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    <Button
        x:Name="ValidateData"
        Content="Validate Data" />
</StackPanel>

--实现了流畅验证的模型：

public class TestModel : ValidatedPropertyChangedBase
{

    private string _firstName;
    public string FirstName
    {
        get { return _firstName; }
        set
        {
            if (_firstName != value)
            {
                _firstName = value;
                NotifyOfPropertyChange(() => FirstName);
            }
        }
    }

    private string _lastName;
    public string LastName
    {
        get { return _lastName; }
        set
        {
            if (_lastName != value)
            {
                _lastName = value;
                NotifyOfPropertyChange(() => LastName);
            }
        }
    }
}

public class TestModelValidation:AbstractValidator<TestModel>
{
    public TestModelValidation()
    {
        RuleFor(t => t.FirstName)
            .NotEmpty()
            .WithMessage("Please enter first name");

        RuleFor(t => t.FirstName)
            .NotEmpty()
            .WithMessage("Please enter last name");
    }
}
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1 回答 1

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能够找出问题所在，控制从视图模型中暴露 HasError。

ErrorText="{Binding RelativeSource={RelativeSource Mode=Self}, Path=InputView.(Validation.Errors), Converter={StaticResource EC}}"
        HasError="{Binding RelativeSource={RelativeSource Mode=Self}, Path=InputView.(Validation.Errors), Converter={StaticResource ECO}}"

使用转换器在控件上添加了属性，并解决了该问题。

于 2021-05-29T16:56:53.380 回答