Wpf Prism中添加新控件的区域适配器

上节中我们讲了怎么样定义一个区域与区域引用视图，但并不是所有的组件都支持组件当作区域使用，比如StackPanel就不支持当作区域来使用：

我们自接使用会报以下错误，这时候我们就要自定义一个区域适配器：

 1.首先我们创建一个StackPanelRegionAdapter的类：

using Prism.Regions;
using System.Windows;
using System.Windows.Controls;

namespace MyTest
{
    public class StackPanelRegionAdapter : RegionAdapterBase<StackPanel>
    {
        public StackPanelRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory)
            : base(regionBehaviorFactory)
        {
        }

        protected override void Adapt(IRegion region, StackPanel regionTarget)
        {
            region.Views.CollectionChanged += (s, e) => 
            {
               if (e.Action==System.Collections.Specialized.NotifyCollectionChangedAction.Add)
                {
                    foreach (FrameworkElement view in e.NewItems) 
                        {
                        regionTarget.Children.Add(view);
                        }
                }
            };
        }

        protected override IRegion CreateRegion()
        {
            return new Region();
        }
    }
}

2.修改MainWindow.xaml为StackPanel作为Region的容器：

 3.我们需要在app中注册定义的StackPanelRegionAdapter

using Prism.Ioc;
using Prism.Regions;
using System.Windows;
using System.Windows.Controls;

namespace MyTest
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App
    {
        protected override Window CreateShell()
        {
            return Container.Resolve<MainWindow>();
        }

        protected override void RegisterTypes(IContainerRegistry containerRegistry)
        {

        }
        protected override void ConfigureRegionAdapterMappings(RegionAdapterMappings regionAdapterMappings)
        {
            base.ConfigureRegionAdapterMappings(regionAdapterMappings);
            regionAdapterMappings.RegisterMapping(typeof(StackPanel)
                , Container.Resolve<StackPanelRegionAdapter>());

        }
    }   
}

4.修改MainWindowViewModel中绑定的名字：

using Prism.Mvvm;
using Prism.Regions;

namespace MyTest
{
    public class MainWindowViewModel:BindableBase
    {

        private string _title = "hello";
        public string Title
        {
            get { return _title; }
            set { SetProperty(ref _title, value); }
        }

        private readonly IRegionManager regionManager;
        

        public MainWindowViewModel(IRegionManager regionManager) 
        {
            this.regionManager = regionManager;
            regionManager.RegisterViewWithRegion("stackRegion", typeof(ViewA));

        }        

    }
}  

启动项目，我们就可以将StackPanel作为容器使用了：