Prism v2 實戰（三）：RegionAdapter 區域適配器註冊與自訂控件支援擴充

預設適配器映射

在 Bootstrapper.ConfigureRegionAdapterMappings 中註冊：

protected virtual RegionAdapterMappings ConfigureRegionAdapterMappings() 
{
    var mappings = Container.TryResolve<RegionAdapterMappings>();
    if (mappings != null) 
    {
        mappings.RegisterMapping(typeof(Selector), Container.Resolve<SelectorRegionAdapter>());
        mappings.RegisterMapping(typeof(ItemsControl), Container.Resolve<ItemsControlRegionAdapter>());
        mappings.RegisterMapping(typeof(ContentControl), Container.Resolve<ContentControlRegionAdapter>());
    }
    return mappings;
}

區域建立流程

protected virtual IRegion CreateRegion(DependencyObject target, string regionName) 
{
    var adapter = RegionAdapterMappings.GetMapping(target.GetType());
    return adapter.Initialize(target, regionName);
}

擴充支援 StackPanel

XAML 直接寫 <StackPanel cal:RegionManager.RegionName="MainRegion" /> 會失敗，因無對應適配器。需自訂 StackPanelRegionAdapter : IRegionAdapter 並註冊至映射表。