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POVisibility against the collection of items in WPF
 

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  1. POVisibility against the collection of items in WPF
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    <p>I have dropdown and Grid. in the grid column there is hyperlink.If the Dropdown collection contains 1 item then the dropdown should be invisible.I meean need a logic to bind Visibility against the collection of items.</p> <p>Here is the XAML for one Hyperlink in the GRid.</p> <pre><code> &lt;!--Associate--&gt; &lt;TextBlock Margin="10, 0, 0, 0"&gt; &lt;TextBlock.Visibility&gt; &lt;MultiBinding Converter="{StaticResource courseListVisibilityConverter}" ConverterParameter="Associate"&gt; &lt;Binding Path="IsCourseAssocited" RelativeSource="{RelativeSource Mode=FindAncestor,AncestorType={x:Type DPA2:TakenCoursesNotApplied}}" /&gt; &lt;Binding Path="DataContext" RelativeSource="{RelativeSource Self}" /&gt; &lt;/MultiBinding&gt; &lt;/TextBlock.Visibility&gt; &lt;Hyperlink DataContext="{Binding}" Name="Associate" IsEnabled="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TextBlock}}, Path=IsVisible}" Click="Associate_Click"&gt; &lt;TextBlock TextWrapping="Wrap" Text="Associate" /&gt; &lt;/Hyperlink&gt; &lt;/TextBlock&gt; public class CourseListVisibilityConverter : IMultiValueConverter { public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture) { if (value == null || value[0] == null || value[1] == null) return Visibility.Collapsed; bool IsEditMode = value[0] == DependencyProperty.UnsetValue ? false : (bool)value[0]; if (value[1].GetType() == typeof(Course)) { Course course = value[1] as Course; if (course == null) return string.Empty; //Visibility retVal = Visibility.Visible; switch (parameter.ToString()) { case "CodeLink": if (!IsEditMode) return Visibility.Collapsed; if (course.HideOptions) return Visibility.Collapsed; if (course.IsInElectivePool &amp;&amp; course.IsManualAdd) return Visibility.Visible; if (!course.IsInElectivePool &amp;&amp; !course.IsWaived) return Visibility.Visible; if (course.IsInElectivePool &amp;&amp; course.FulFillmentId != 0 &amp;&amp; course.FulFillmentId != -1 &amp;&amp; !course.IsWaived) return Visibility.Visible; return Visibility.Collapsed; case "CodeNoLink": if (!IsEditMode) return Visibility.Visible; if (course.HideOptions) return Visibility.Visible; if (course.IsInElectivePool &amp;&amp; course.IsManualAdd) return Visibility.Collapsed; if (!course.IsInElectivePool &amp;&amp; !course.IsWaived) return Visibility.Collapsed; if (course.IsInElectivePool &amp;&amp; course.FulFillmentId != 0 &amp;&amp; course.FulFillmentId != -1 &amp;&amp; !course.IsWaived) return Visibility.Collapsed; return Visibility.Visible; case "Waive": if (course.HideOptions) return Visibility.Collapsed; if (IsEditMode &amp;&amp; !course.IsWaived &amp;&amp; !(course.RetakenFlag == RetakeFlagType.RetakeOfCourse) &amp;&amp; !course.IsInElectivePool) return Visibility.Visible; return Visibility.Collapsed; case "UndoWaive": if (course.HideOptions) return Visibility.Collapsed; if (IsEditMode &amp;&amp; course.IsWaived &amp;&amp; !(course.RetakenFlag == RetakeFlagType.RetakeOfCourse) &amp;&amp; !course.IsInElectivePool) return Visibility.Visible; return Visibility.Collapsed; case "UndoAdd": if (course.HideOptions) return Visibility.Collapsed; if (IsEditMode &amp;&amp; course.IsManualAdd &amp;&amp; (!(course.RetakenFlag == RetakeFlagType.RetakeOfCourse) &amp;&amp; !course.IsInElectivePool)) return Visibility.Visible; return Visibility.Collapsed; case "Associate": if (course.HideOptions) return Visibility.Collapsed; if (IsEditMode &amp;&amp; course.IsCourseAssocited) return Visibility.Collapsed; else if (IsEditMode &amp;&amp; ((course.Status.ToUpper() == "COMPLETE" || course.Status.ToUpper() == "DROPPED"))) { return Visibility.Visible; } else { return Visibility.Collapsed; } //case "UnAssociate": // if (course.HideOptions) return Visibility.Collapsed; // if (IsEditMode &amp;&amp; (course.IsCourseAssocited)) // { // return Visibility.Visible; // } // else // { // return Visibility.Collapsed; // } case "FullFillRequirement": if (course.HideOptions) return Visibility.Collapsed; if (IsEditMode &amp;&amp; ((course.Status.ToUpper() == "FUTURE"))) { return Visibility.Visible; } else { return Visibility.Collapsed; } default: return Visibility.Collapsed; } } else if (value[1].GetType() == typeof(ElectivePool)) { ElectivePool electivePool = value[1] as ElectivePool; if (electivePool == null) return string.Empty; switch (parameter.ToString()) { case "Waive": if (IsEditMode &amp;&amp; !electivePool.IsWaived) return Visibility.Visible; return Visibility.Collapsed; case "UndoWaive": if (IsEditMode &amp;&amp; electivePool.IsWaived) return Visibility.Visible; return Visibility.Collapsed; } } return Visibility.Visible; } public object[] ConvertBack(object value, Type[] targetType, object parameter, CultureInfo culture) { throw new NotSupportedException(); } } </code></pre>
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    1. USAnatoliy Nikolaev
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