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:
Element does not exist or it is virtualized; use VirtualizedItem Pattern if it is supported.
The stack trace only shows:
[External Code]
my method that opens the dialog which contains the DatePickers (amongst other things)
[External Code]
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.
XAML
<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">
<Grid>
<DatePicker SelectedDate="{Binding TheDate}"
x:Name="datePicker1" />
<Button Content="Button"
x:Name="button1"
Click="button1_Click" />
</Grid>
</Window>
Code Behind
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());
}
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..
