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POWPF error template not showing
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  1. POWPF error template not showing
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    copied!<p>I get no binding errors and this code works at another place. I haven't found out yet what I do now differently to the code where it works and it's not that much code.</p> <p>In <strong>UserControl.Resource:</strong></p> <pre><code>&lt;Style TargetType="TextBox"&gt; &lt;Setter Property="BorderBrush" Value="DarkBlue"/&gt; &lt;Setter Property="BorderThickness" Value="1"/&gt; &lt;Setter Property="Margin" Value="0,1,0,1"/&gt; &lt;Setter Property="Validation.ErrorTemplate"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;AdornedElementPlaceholder/&gt; &lt;Grid Margin="2,0,0,0"&gt; &lt;Ellipse Width="20" Height="20" Fill="Red"/&gt; &lt;TextBlock Foreground="White" Text="X" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;/StackPanel&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Validation.HasError" Value="True"&gt; &lt;Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p><strong>Below in Xaml too:</strong></p> <pre><code>&lt;TextBlock Height="23" HorizontalAlignment="Left" Margin="22,90,0,0" Text="Keywords" VerticalAlignment="Top"/&gt; &lt;TextBox Height="23" HorizontalAlignment="Left" Margin="22,108,0,0" VerticalAlignment="Top" Width="244"&gt; &lt;Binding Path="Tags" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"&gt; &lt;Binding.ValidationRules&gt; &lt;DataErrorValidationRule ValidatesOnTargetUpdated="False"/&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/TextBox&gt; </code></pre> <p>The button SAVE in my ViewModel is only activated when the <code>Model.Tags</code> property is longer 10 chars input from the user. The button activation/disable works fine when I enter 10,11 and then back 8 chars. All the property changes are fired.</p> <p><strong>Model</strong>:</p> <pre><code>namespace TBM.Model { public class Document : EntityBase , IDataErrorInfo { public int Id { get; set; } public string DocumentName { get; set; } public string Tags { get; set; } public byte[] DocumentData { get; set; } public int PeriodId { get; set; } string IDataErrorInfo.Error { get { return null; } } string IDataErrorInfo.this[string propertyName] { get { return this.GetValidationError(propertyName); } } public bool IsValid { get { foreach (string property in ValidatedProperties) if (GetValidationError(property) != null) return false; return true; } } static readonly string[] ValidatedProperties = { "Tags", }; private string GetValidationError(string propertyName) { if (Array.IndexOf(ValidatedProperties, propertyName) &lt; 0) return null; string error = null; switch (propertyName) { case "Tags": error = this.IsTagsEmpty(Tags); break; default: Debug.Fail("Unexpected property being validated on Document: " + propertyName); break; } return error; } private string IsTagsEmpty(string value) { if (value != null &amp;&amp; value.Trim().Length &gt;= 10) return null; else return "The keywords must have at least 10 chars!"; } } } </code></pre> <p><strong>ViewModel</strong>:</p> <pre><code> public RelayCommand SaveDocumentCommand { get { return _saveDocumentCommand ?? (_saveDocumentCommand = new RelayCommand(() =&gt; SaveDocument(),() =&gt; CanSaveDocument())); } } private bool CanSaveDocument() { return _document.IsValid; } //... </code></pre> <p>What does not work is the ErrorTemplate with the red Ellipse is not showing at all?</p> <p><strong>UPDATE:</strong> Exactly the below code works in a TEST project. But in my productive project It does not find the Resource??? Why the heck this?</p> <pre><code>&lt;TextBlock Height="23" HorizontalAlignment="Left" Margin="22,89,0,0" Text="Keywords" VerticalAlignment="Top"/&gt; &lt;TextBox Style="{StaticResource bla}" Height="23" HorizontalAlignment="Left" Margin="22,109,0,0" VerticalAlignment="Top" Width="244"&gt; &lt;Binding Path="Tags" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"&gt; &lt;Binding.ValidationRules&gt; &lt;DataErrorValidationRule ValidatesOnTargetUpdated="False" ValidationStep="UpdatedValue"/&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/TextBox&gt; &lt;UserControl.Resources&gt; &lt;Style x:Name="bla" TargetType="TextBox"&gt; &lt;Setter Property="BorderBrush" Value="DarkBlue"/&gt; &lt;Setter Property="BorderThickness" Value="1"/&gt; &lt;Setter Property="Margin" Value="0,1,0,1"/&gt; &lt;Setter Property="Validation.ErrorTemplate"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;AdornedElementPlaceholder/&gt; &lt;Grid Margin="2,0,0,0"&gt; &lt;Ellipse Width="20" Height="20" Fill="Red"/&gt; &lt;TextBlock Foreground="White" Text="X" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; &lt;/StackPanel&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Validation.HasError" Value="True"&gt; &lt;Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/UserControl.Resources&gt; </code></pre>
 

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