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POWPF DatePicker throws exception when changing month
 

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    <p>Ok I have this project I'm working on in WPF (Visual C# 2010 Express), and I have a few DatePickers that are bound to DateTime-properties. Now if I just open up the "picker" and start changing months immediately there is no problem. However, if I select a date and then try to change the month, I get the following Exception:</p> <blockquote> <p>Element does not exist or it is virtualized; use VirtualizedItem Pattern if it is supported.</p> </blockquote> <p>The stack trace only shows:</p> <blockquote> <p>[External Code]<br /> my method that opens the dialog which contains the DatePickers (amongst other things)<br /> [External Code]</p> </blockquote> <p>If the properties are nullable or not doesn't seem to make a difference, and can't find a single result on any of the major search engines on the above exception.</p> <p><strong>XAML</strong></p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded"&gt; &lt;Grid&gt; &lt;DatePicker SelectedDate="{Binding TheDate}" x:Name="datePicker1" /&gt; &lt;Button Content="Button" x:Name="button1" Click="button1_Click" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p><strong>Code Behind</strong></p> <pre><code> class TheClass { public DateTime TheDate { get; set; } } public MainWindow() { theClass = new TheClass(); theClass.TheDate = DateTime.Now; InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { this.DataContext = theClass; } private void button1_Click(object sender, RoutedEventArgs e) { System.Windows.MessageBox.Show(theClass.TheDate.ToString()); } </code></pre> <p>Anyone ever seen this behaviour before or have any other ideas? I'm far from a WPF-expert and have honestly no idea what might be causing this or where to start looking..</p>
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    1. USRobin
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    1. COTry to reproduce in a mini App. Either you find the problem or you have something to post here.
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      1. USHenk Holterman
    2. COGood idea, can't believe I didn't even consider that.. But anyway, I managed to duplicate the exact same error with a minimum amount of code in a brand new project. Odd thing is, if I choose to ignore the exception and continue running, it is not thrown again and I can change month just fine. (Maybe VS remembers my choice to continue?) XAML: https://gist.github.com/993005 C#: https://gist.github.com/993003
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      1. USRobin
    3. COI moved your code into the actual question in case github dies today.
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      1. USuser7116
 

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