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POHow can I validate multiple object properties and then apply a style with a tooltip on one of my form elements?
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  1. POHow can I validate multiple object properties and then apply a style with a tooltip on one of my form elements?
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    copied!<p>This is a WPF/MVVM project. I am using the MS Enterprise Library Validation Application Block v5.0. </p> <p>The requirement is that if the value of a combobox is "Facilities" or "Other" then the Comment field must have a value.</p> <p>That said, I created a custom validator and I am performing validation in this manner:</p> <pre><code>ValidationResults results = Validation.Validate&lt;Annotation&gt;(this.Annotation); </code></pre> <p>There are other error possibilities and those are covered with the standard VAB attributes.</p> <p>This seems to be working fine. So, now, if I have an error condition, it could be any one of the rules and I have the ValidationResults collection available to interrogate in order to determine which property has the error. However, I am having trouble with applying a style for a specific element when this occurs. At one point, I was using property level validation for a given control but that doesn't work when I need to compare multiple properties for one validation rule.</p> <pre><code>vab:Validate.BindingForProperty="Text" </code></pre> <p>The property above and this style work for a simple single property validation like a StringLenghtValidator.This doesn't work in my scenario. </p> <pre><code>&lt;Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"&gt; &lt;Setter Property="Background" Value="White"/&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Validation.HasError" Value="true"&gt; &lt;Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p>How can I get the Comments textbox to have a certain style after the multiple property custom validator reports an error?</p>
 

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