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How to change displaytext while changing format

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DatePicker
This is a migrated thread and some comments may be shown as answers.
Christin
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Christin asked on 29 Mar 2012, 02:57 PM
I've got some problems during change displaytext while changing format, would someone help?

<telerik:HeaderedContentControl Height="194" HorizontalAlignment="Left" Margin="316,241,0,0" Name="headeredContentControl1" VerticalAlignment="Top" Width="277">
    <StackPanel Orientation="Horizontal">
        <ComboBox Name="comboMode" Width="140" SelectionChanged="comboMode_SelectionChanged"></ComboBox>
        <telerik:RadDatePicker Width="120" Name="dtPicker"></telerik:RadDatePicker>
    </StackPanel>
</telerik:HeaderedContentControl>
 
public MainPage()
 {
     InitializeComponent();
     this.Loaded += new RoutedEventHandler(MainPage_Loaded);
 }
 
 void MainPage_Loaded(object sender, RoutedEventArgs e)
 {
     dtPicker.Culture = new System.Globalization.CultureInfo(Thread.CurrentThread.CurrentUICulture.Name);   // actually is "zh-cn"
    SetData();
 }

 private void SetData()
 {
     IDictionary<string,string> dic = new Dictionary<string,string>();
     dic.Add("Day","日");
     dic.Add("Month","月");
     dic.Add("Year","年");
 
     comboMode.ItemsSource = dic;
     comboMode.DisplayMemberPath = "Value";
     comboMode.SelectedValuePath = "Key";
 }
 
 private void comboMode_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     string item = comboMode.SelectedValue.ToString();
 
     switch (item)
     {
         case "Day":
             dtPicker.DateSelectionMode = DateSelectionMode.Day;
             dtPicker.Culture.DateTimeFormat.ShortDatePattern = "yyyy年MM月dd日";   // sounds invalid?             
             break;
         case "Month":
             dtPicker.DateSelectionMode = DateSelectionMode.Month;
             //dtPicker.Culture.DateTimeFormat.ShortDatePattern = "yyyy年MM月";
             dtPicker.Culture.DateTimeFormat.ShortDatePattern = "yyyy-MM";
             break;
         case "Year":
             dtPicker.DateSelectionMode = DateSelectionMode.Year;
             dtPicker.Culture.DateTimeFormat.ShortDatePattern = "yyyy";             
             break;
     }
 }

questions are:
1. Error occurs when i choose combobox to "Day";
2. i want to change the display text while the combobox.selectionchanged fired, actually it's never happend.
    for example, when i changed to "day", it would display "2012-03-29", the display "2012" when changed to "year".
3.when i changed from "Day" to "Year", the current year become "2009" but not "2012" when the dropdown is open ,do i got sth wrong?

your help would be appreciated, thanks!

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Christin
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