这份原稿.WP7上ListPicker的微绑定约定

我正在尝试口径。一个新项目的微框架，但我坚持绑定一个ListPicker(来自工具包)。当我将控件更改为简单的DropDown时，一切都如预期的那样工作。我假设DropDown工作正常，因为这里实现了默认约定:

AddElementConvention<Selector>(Selector.ItemsSourceProperty, "SelectedItem", "SelectionChanged")
    .ApplyBinding = (viewModelType, path, property, element, convention) => {
        if (!SetBinding(viewModelType, path, property, element, convention))
            return false;
        ConfigureSelectedItem(element, Selector.SelectedItemProperty,viewModelType, path);
        ApplyItemTemplate((ItemsControl)element, property);
        return true;
    };

ListPicker不实现选择器，所以我试着在我的引导程序中添加一个自定义约定:

static void AddCustomConventions() {
    AddElementConvention<ListPicker>(ListPicker.ItemsSourceProperty, "SelectedItem", "SelectionChanged")
        .ApplyBinding = (viewModelType, path, property, element, convention) => {
            ConventionManager.ConfigureSelectedItem(element, ListPicker.SelectedItemProperty,viewModelType, path);
            return true;
        };
}

不幸的是，这不起作用。你能帮忙吗?

ConventionManager.AddElementConvention<ListPicker>(ListPicker.ItemsSourceProperty, "SelectedItem", "SelectionChanged")
    .ApplyBinding = (viewModelType, path, property, element, convention) =>
    {
        if (ConventionManager.GetElementConvention(typeof(ItemsControl)).ApplyBinding(viewModelType, path, property, element, convention))
        {
            ConventionManager.ConfigureSelectedItem(element, ListPicker.SelectedItemProperty, viewModelType, path);
            return true;
        }
        return false;
    };