Delete toolkit: last element bound to listpicker

Delete toolkit: the last element bound to listpicker will throw the SelectedItem must always be set to a valid value exception.

Visual testing is a problem with this Code:

 
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Private static void OnSelectedItemChanged (DependencyObject o, DependencyPropertyChangedEventArgs e)
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{
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(ListPicker) o). OnSelectedItemChanged (e. OldValue, e. NewValue );
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}
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[SuppressMessage ("Microsoft. Naming", "CA2204: Literals shocould be spelled correctly", MessageId = "SelectedItem", Justification = "Property name.")]
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Private void OnSelectedItemChanged (object oldValue, object newValue)
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{
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If (newValue! = Null & (null = Items | Items. Count = 0 ))
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{
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If (null = Template)
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{
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// Can't set the value now; remember it for later
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_ DeferredSelectedItem = newValue;
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Return;
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}
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Else
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{
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Throw new InvalidOperationException (Properties. Resources. InvalidSelectedItem );
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}
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}
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// Validate new value
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Int newValueIndex = (null! = NewValue )? Items. IndexOf (newValue):-1;
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If (-1 = newValueIndex) & (0 <Items. Count ))
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{
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Throw new InvalidOperationException (Properties. Resources. InvalidSelectedItem );
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}
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// Synchronize SelectedIndex property
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If (! _ UpdatingSelection)
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{
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_ UpdatingSelection = true;
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SelectedIndex = newValueIndex;
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_ UpdatingSelection = false;
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}
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// Switch to Normal mode or size for current item
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If (ListPickerMode. Normal! = ListPickerMode)
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{
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ListPickerMode = ListPickerMode. Normal;
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}
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Else
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{
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SizeForAppropriateView (false );
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}
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// Fire SelectionChanged event
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Var handler = SelectionChanged;
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If (null! = Handler)
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{
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IList removedItems = (null = oldValue )? New object [0]: new object [] {oldValue };
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IList addedItems = (null = newValue )? New object [0]: new object [] {newValue };
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Handler (this, new SelectionChangedEventArgs (removedItems, addedItems ));
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}
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}
Change it if you are interested

Author: wingyiu