ListPicker TwoWay Binding and itemsource

Question

I try to build settings page to my Windows Phone 8 app, the settings page has couple of ListPickers. The basic idea has been taken from here: http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff769510(v=vs.105).aspx

In my settings page xaml I have just declared:

<toolkit:ListPicker x:Name="listPicker1" ExpansionMode="FullScreenOnly" SelectionMode="Single" FullModeItemTemplate="{StaticResource generalListPickerFullTemplate}" ItemTemplate="{StaticResource generalListPickerTemplate}" SelectedItem="{Binding Source={StaticResource appSettings}, Path=listPicker1, Mode=TwoWay}" />

In "code behind", I create list and set it item source to listPicker1

listPicker1List.Add(new ListPickerItem() { name = "First value", value = "value_1" });
listPicker1List.Add(new ListPickerItem() { name = "Second value", value = "value_2" });
this.listPicker1.ItemsSource = listPicker1List;

StaticResource appSettings points to class which is basically similar than in the MS example,

public ListPickerItem listPicker1
{
    get
    {
        return GetValueOrDefault<ListPickerItem>(KeyName, Default);
    }

    set
    {
        if (AddOrUpdateValue(KeyName, value))
        {
            Save();
        }
    }
}

So is it not possible to set itemsource and use two way bindig? If I set these both, I get System.ArgumentOutOfRangeException .

Basically my only goal is to have listPicker with items, which have text to display for user and value. And to easily set and get these to Isolates storage.

Answer 1

设置itemsource或选择一个项目时出现此错误？