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POBinding doesn't work in ListView
 

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  1. POBinding doesn't work in ListView
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    <p>I have a wpf control named DataPicker which has a dependency property named SelectedDate.</p> <p>In simple cases it works well but there is one case where binding fails and I can't understand why: when i try to bind it inside a ListView. </p> <p>For example, I have class (INotifyPropertyChanged is implemented)</p> <pre><code>public class TestClass : INotifyPropertyChanged { public string Name { get; set; } public DateTime Date { get; set; } } </code></pre> <p>and try to bind sample collection like </p> <pre><code>public ObservableCollection&lt;TestClass&gt; Items { get; set; } </code></pre> <p>which has one element in it.</p> <p>Binding looks like</p> <pre><code> &lt;Window x:Class="Neverov.Test.Window1" x:Name="this" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:Neverov.Framework;assembly=Neverov.Framework"&gt; &lt;Grid&gt; &lt;ListView ItemsSource="{Binding ElementName=this, Path=Items}"&gt; &lt;ListView.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel&gt; &lt;TextBlock Text="{Binding Name}"/&gt; &lt;local:DatePicker SelectedDate="{Binding Date, Mode=TwoWay}"/&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/ListView.ItemTemplate&gt; &lt;/ListView&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>and Name property works fine.</p> <p>inside my DatePicker date value is shown this way:</p> <pre><code>&lt;TextBox x:Name="PART_TextBox"&gt; &lt;TextBox.Text&gt; &lt;Binding Path="SelectedDate" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type local:DatePicker}}" Mode="TwoWay" Converter="{StaticResource DateTimeConverter}" ConverterParameter="d"&gt; &lt;/Binding&gt; &lt;/TextBox.Text&gt; &lt;/TextBox&gt; </code></pre> <p>any ideas why this could happen?</p> <p>More code of the DatePicker class: (some specific properties that I need I'll rather miss to keep code size not so large)</p> <pre><code>[TemplatePart(Name = PartPopup, Type = typeof(Popup))] [TemplatePart(Name = PartMonthBack, Type = typeof(ButtonBase))] [TemplatePart(Name = PartMonthForward, Type = typeof(ButtonBase))] [TemplatePart(Name = PartDates, Type = typeof(Selector))] [TemplatePart(Name = PartTextBox, Type = typeof(TextBox))] [TemplatePart(Name = PartCheckBox, Type = typeof(CheckBox))] [TemplatePart(Name = PartToggleButton, Type = typeof(ToggleButton))] public class DatePicker : Control, INotifyPropertyChanged { ... public static readonly DependencyProperty SelectedDateProperty = DependencyProperty.Register("SelectedDate", typeof(DateTime?), typeof(DatePicker), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, (sender, e) =&gt; { var datePicker = sender as DatePicker; if (datePicker != null) { var oldValue = e.OldValue as DateTime?; DateTime selectedDateForPopup = datePicker.SelectedDate ?? DateTime.Now; datePicker.CurrentlyViewedMonth = selectedDateForPopup.Month; datePicker.CurrentlyViewedYear = selectedDateForPopup.Year; datePicker.OnDateChanged(datePicker.SelectedDate, oldValue); var popup = datePicker.GetTemplateChild(PartPopup) as Popup; if (popup != null) popup.IsOpen = false; } })); ... //a lot more not so important code here } </code></pre>
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    1. PO
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    1. USAndrey Neverov
    1. USAndrey Neverov
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    1. PO
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      1. PTAnswer
    2. PO
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      1. POBinding doesn't work in ListView
      1. This table or related slice is empty.
      1. VTUpMod
    1. COwhat is the problem exactly? does that date not show up in the datePicker, or does the Selected Date in the datepicker not getting propagated to your TestClass object? In the latter case, you may want to add a Mode=TwoWay to your datepicker binding (i.e. - SelectedDate="{Binding Date, Mode=TwoWay}"
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      1. POBinding doesn't work in ListView
      1. USAndrew Garrison
    2. COSelectedDate in the DataPicker doesn't get to my TestClass object, and yes, Mode is set to TwoWay everywhere
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      1. POBinding doesn't work in ListView
      1. USAndrey Neverov
    3. COare you modifying the source code of the DatePicker? or are you just posting it for our convenience?
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      1. POBinding doesn't work in ListView
      1. USAndrew Garrison
 

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