Bedingte Datenprüfung in WPF

Question

Ich habe 3 Radiobuttons und ein Textfeld.

Wenn der Benutzer wählt "Telefon" Radio-Button Ich sollte erlauben, nur Zahlen in das Textfeld eingeben, ähnlich den anderen Fällen E-Mail und Name. E-Mail sollte im richtigen Format sein. und Name sollte mit Charakter beginnen. Wie geht das in wpf?

Answer 1

Bitte versuchen Sie die nächste:

Der TextBox Code

<TextBox x:Name="TextBoxWithValidation" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Text="{Binding Text, UpdateSourceTrigger=LostFocus, Mode=TwoWay, 
          NotifyOnValidationError=True, ValidatesOnDataErrors=True}"> 
     <Validation.ErrorTemplate> 
      <ControlTemplate> 
       <DockPanel> 
        <Border BorderBrush="Red" BorderThickness="1"> 
         <AdornedElementPlaceholder x:Name="ControlWithError"/> 
        </Border> 
        <ContentControl x:Name="ValidationSymbol" Margin="-10,0,0,0" Content="{Binding ElementName=ControlWithError, 
        Path=AdornedElement.(Validation.Errors), Converter={wpfValidationIssueHelpAttempt:Errors2ValidationErrorContentConverter}, 
        UpdateSourceTrigger=PropertyChanged}" ContentTemplate="{StaticResource CommonValidationSymbol}"/> 
       </DockPanel> 
      </ControlTemplate> 
     </Validation.ErrorTemplate> 
    </TextBox> 

Der Konverter Code:

public class Errors2ValidationErrorContentConverter : MarkupExtension, IValueConverter 
{ 
    public override object ProvideValue(IServiceProvider serviceProvider) 
    { 
     return this; 
    } 

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     var errors = value as ReadOnlyCollection<ValidationError>; 
     ValidationError error; 
     if (errors == null || (error = errors.FirstOrDefault()) == null) return null; 
     return error.ErrorContent.ToString(); 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

Die Validierung Symbolcode (fügen Sie dies mit dem Ressource-Abschnitt) :

 <DataTemplate x:Key="CommonValidationSymbol"> 
      <TextBlock Panel.ZIndex="1000" Foreground="Red" FontFamily="Segoe UI" FontWeight="Bold" 
          Width="10" 
          FontSize="15" Background="#0000FF00" Text="!"> 
     <ToolTipService.ToolTip> 
      <ToolTip x:Name="validationTooltip" Content="{Binding }" Placement="Right"/> 
     </ToolTipService.ToolTip> 
      </TextBlock> 
     </DataTemplate> 

Hier ist mein Datacontext Code

public class MainViewModel:BaseObservableObject, IDataErrorInfo 
{ 
    private string _text; 
    private string _error; 
    private bool _isMailChecked; 
    private bool _isNameChecked; 
    private bool _isPhoneChecked; 

    public virtual string Text 
    { 
     get { return _text; } 
     set 
     { 
      _text = value; 
      OnPropertyChanged(() => Text); 
     } 
    } 

    public string this[string columnName] 
    { 
     get 
     { 
      if (columnName == "Text") 
      { 
       if (string.IsNullOrEmpty(Text)) return string.Empty; 
       Error = string.Empty; 
       return GetValidationResult(); 
      } 
      return String.Empty; 
     } 
    } 

    private string GetValidationResult() 
    { 
     //define your logic here 
     if (IsNameChecked) 
     { 
      Error = "name is wrong!"; 
     } 
     if (IsMailChecked) 
     { 
      Error = "mail is wrong!"; 
     } 
     if (IsPhoneChecked) 
     { 
      Error = "phone is wrong"; 
     } 

     return Error; 
    } 

    public string Error 
    { 
     get { return _error; } 
     private set 
     { 
      _error = value; 
      OnPropertyChanged(() => Error); 
     } 
    } 

    public bool IsNameChecked 
    { 
     get { return _isNameChecked; } 
     set 
     { 
      _isNameChecked = value; 
      OnPropertyChanged(() => IsNameChecked); 
      if (value == false) return; 
      IsMailChecked = false; 
      IsPhoneChecked = false; 
      Text = String.Empty; 
     } 
    } 

    public bool IsMailChecked 
    { 
     get { return _isMailChecked; } 
     set 
     { 
      _isMailChecked = value; 
      OnPropertyChanged(() => IsMailChecked); 
      if (value == false) return; 
      IsNameChecked = false; 
      IsPhoneChecked = false; 
      Text = String.Empty; 
     } 
    } 

    public bool IsPhoneChecked 
    { 
     get { return _isPhoneChecked; } 
     set 
     { 
      _isPhoneChecked = value; 
      OnPropertyChanged(() => IsPhoneChecked); 
      if (value == false) return; 
      IsMailChecked = false; 
      IsNameChecked = false; 
      Text = String.Empty; 
     } 
    } 
} 

Grüße.