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PO
 

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  1. PO
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    <p>So there seems to be two problems here..</p> <p>I would probably be tempted to set a property after calling IncludesCanExecuteCommand.RaiseCanExecuteChanged() which will cause the command to reevaluate its CanExecuteCommand..</p> <p>Put the hyperlink in a panel and then bind the visibility to the property in 1.) with a converter to return a valid Visiblility enum such as Collapsed, Visible etc.</p> <p>So for clarity - something like</p> <pre><code>&lt;StackPanel Visibility="{Binding IsHyperlinkVisible, Mode=TwoWay, Converter=boolToVisibilityConverter}"&gt; &lt;TextBlock&gt; &lt;Hyperlink Command="{Binding WhateverTheHyperlinkDoesCommand}"&gt;Link text&lt;/Hyperlink&gt; &lt;/TextBlock&gt; &lt;/StackPanel&gt; </code></pre> <p>And the viewmodel looks something like this (if the viewmodelbase implements some version of NotifyPropertyChanged...</p> <pre><code> public class ViewModel : NotificationViewModelBase { public ViewModel() { this.WhateverTheHyperlinkDoesCommand = new DelegateCommand&lt;object&gt;( this.ExecuteWhateverTheHyperlinkDoesCommand, this.CanWhateverTheHyperlinkDoesCommand); } private void ExecuteWhateverTheHyperlinkDoesCommand(object arg) { this.SomeOtherProperty = true; } private bool someOtherProperty; public bool SomeOtherProperty { get { return this.someOtherProperty; } set { if (this.ChangeAndRaisePropertyChanged( () =&gt; this.SomeOtherProperty, value, ref this.someOtherProperty)) { this.WhateverTheHyperlinkDoesCommand.RaiseCanExecuteChanged(); } } } private bool isHyperlinkProperty; public bool IsHyperlinkProperty { get { return this.isHyperlinkProperty; } set { this.ChangeAndRaisePropertyChanged(() =&gt; this.IsHyperlinkProperty, value, ref this.isHyperlinkProperty); } } private bool CanWhateverTheHyperlinkDoesCommand(object obj) { // So based on a certain condition - lets say some other property if (this.SomeOtherProperty == false) { this.IsHyperlinkProperty = true; return false; } this.IsHyperlinkProperty = false; return true; } public DelegateCommand&lt;object&gt; WhateverTheHyperlinkDoesCommand { get; set; } </code></pre> <p>} }</p>
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    1. POCollapse hyperlink when Command.CanExecute returns false
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    1. USThe Unculled Badger
    1. USThe Unculled Badger
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    1. CONot sure I understand your temptation, can you explain in code maybe?
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    2. COSee edit and some code
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      1. USThe Unculled Badger
    3. COYes, I see. That seems like a lot of code that I was trying to ask whether I could avoid because the hyperlink already knows whether or not it can execute. Thanks for the clear notes though.
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      1. USAndyC
 

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