public class PreisValidationRule : ValidationRule
{
public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
{
decimal val;
if (decimal.TryParse(value.ToString(), out val))
{
if (val < 0)
{
return new ValidationResult(false, "Preis darf nicht negativ sein");
}
return ValidationResult.ValidResult;
}
return new ValidationResult(false, "Keine Zahl eingegeben");
}
}
<TextBox Grid.Column="1" Grid.Row="0" x:Name="tx">
<Binding Path="Price" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<local:PreisValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox>
<TextBlock Text="??????" />
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<DataTemplate DataType="{x:Type ValidationError}">
<TextBlock FontStyle ="Italic"
Foreground ="Red"
HorizontalAlignment="Right"
Margin ="0,1"
Text ="{Binding ErrorContent}" />
</DataTemplate><ContentPresenter Grid.Row="1" Grid.Column="2"
Content ="{Binding (Validation.Errors).CurrentItem, ElementName=txtName}" />
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