Validate PasswordBox in WPF

Question

Is there a way to show error message in AdornedElementPlaceholder while verifiying PasswordBox.

I have something like this:

<ControlTemplate x:Key="DefaultErrorTemplate">
    <StackPanel Orientation="Horizontal">
        <AdornedElementPlaceholder x:Name="placeholder" />
        <Border Background="Red"
                ToolTip="{Binding ElementName=placeholder, Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"
                ToolTipService.InitialShowDelay="0"
                VerticalAlignment="Top"
                Margin="3"
                Width="20"
                Height="20"
                CornerRadius="10">
            <TextBlock Text="!"
                       Foreground="White"
                       FontWeight="Bold"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Center" />
        </Border>
    </StackPanel>
</ControlTemplate>

and im my BaseControlStyle im using that validation

<Style TargetType="Control"
           x:Key="ControlBaseStyle">
        <Setter Property="Validation.ErrorTemplate"
                Value="{StaticResource DefaultErrorTemplate}" />

and it's working like a charm with almost every control that i have(Combobox,DateTimePicker,TextBox) but when i want to use same style for passwordBox it doesn't work.

At picture you can see that it's working with simpe TextBox but not with PasswordBox. I don't know how to extract error message to show it in tooltip i that AdornedElementPlaceholder

It's showing error message for Username property

[Required(ErrorMessage = "Please enter username.")]

I wan't to achieve same thing with passwordBox to give feedback to user about errors (Constraints) when entering password

Any help is really appreciated.

Thanks in advance :)

EDIT:

I have used this for password property

[Required(ErrorMessage = "Please enter password.")]
[RegularExpression(@"^.*(?=.{8,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[^a-zA-Z0-9]).*$")]
[StringLength(maximumLength: 15, ErrorMessage = "Minimum 8 and maximum 15 characters.", MinimumLength = 8)]
public string Password
{
    get { return GetValue<string>(); }
    set { SetValue(value); }
}

and bound to that property with PasswordBoxAssistant

<PasswordBox behaviors:PasswordBoxAssistant.BindPassword="True"
             behaviors:PasswordBoxAssistant.BoundPassword="{Binding Player.Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged,ValidatesOnDataErrors=True}"
             FontSize="{StaticResource defaultFontSize}"
             Grid.Row="2"
             Grid.Column="1"
             Margin="10" />

and have made custom PasswordBoxStyle that is BasedOn ControlBaseStyle

<Style TargetType="{x:Type PasswordBox}"
       BasedOn="{StaticResource ControlBaseStyle}">

i have done same thing with TextBox, but it doesnt work with PasswordBox.

INFO: And i would like to know why you voted to close this question? if there is an answer to this or even guide, i would be happy to close it myself, if not, please provide me an answer before voting to close it. Thanks.

Sickly

How do you set the validation error for the passwordbox? It shows the custom template for me... – Kleptomania

I have updated question on how i bound to Password, and what i did with PasswordBox style. – Sickly

Regarding the close vote: Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example. Your example was certainly not complete (and still isn't) – Kleptomania

Debug your IDataErrorInfo implementation. I don't see it, so I can't know what you did wrong there. I only know that a correct implementation can lead to the desired result (I have a working sample, it's just a bit different from yours) – Kleptomania

Answer 1

I've found an answer. Had to change

<Style TargetType="Control"
       x:Key="ControlBaseStyle">
    <Setter Property="Validation.ErrorTemplate"
            Value="{StaticResource DefaultErrorTemplate}" />

and put it inside

<Trigger Property="Validation.HasError"
         Value="True">
    <Setter Property="Validation.ErrorTemplate"
            Value="{StaticResource DefaultErrorTemplate}" />

aparently it's only working when inside Trigger, and TextBox can work like default and inside Trigger.

Sickly

This is real strange... I can't imagine many reasons for this. One of the few things I could possibly imagine would be a strange implementation behind behaviors:PasswordBoxAssistant.BindPassword. If it assigns an error template somewhere, this might indeed get precedence before a normal setter... – Kleptomania