• Caliburn.Micro之动态注入
  • 发布于 2个月前
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概述
     在Caliburn.Micro中,我们一般在引导程序中实例化SimpleContainer,然后在Configure中去注入我们的实例,那如果我不想在一开始就注入所有实例,我想在其他类模块去实现动态注入,怎么去实现呢?这节就这个场景通过实例展开讲解.

实例
    首先是继承引导程序类并重写我们实现IOC容器需要用到的几个方法
    public class HelloBootstrapper : BootstrapperBase
    {
        public HelloBootstrapper()
        {
            Initialize();
        }
        protected override void OnStartup(object sender, StartupEventArgs e)
        {
            //DisplayRootViewFor<MainWindowViewModel>();
            DisplayRootViewFor<ILogin>();
        }
        private SimpleContainer container;
        protected override void Configure()
        {
            container = new SimpleContainer();
             container.Singleton<SimpleContainer>();
      
        }
        protected override object GetInstance(Type service, string key)
        {
            return container.GetInstance(service, key);
        }
        protected override IEnumerable<object> GetAllInstances(Type service)
        {
            return container.GetAllInstances(service);
        }
        protected override void BuildUp(object instance)
        {
            container.BuildUp(instance);
        }
        #region
        protected override IEnumerable<Assembly> SelectAssemblies()
        {
            return new[] { Assembly.GetExecutingAssembly() };
        }
        #endregion
    }
在这里我们注入 容器本身
container.Singleton<SimpleContainer>();
在我们需要注入实例的获取ioc容器:
 var subContainer = IoC.Get<SimpleContainer>();
然后通过Singleton去注入实例,CreateChildContainer方法可以在容器中生成子容器
    subContainer.Singleton<IViewModel, ShellViewModel>();
            subContainer.Singleton<IViewModel, EventAggregatorViewModel>();
            var subsubContainer = subContainer.CreateChildContainer();
            subsubContainer.Singleton<IViewModel, ShellViewModel>();
            subsubContainer.Singleton<IViewModel, EventAggregatorViewModel>();
通过GetAllInstances可以获取注入的所有实例。
注入实例代码如下:
  public void IocTest1()
        {      
            subContainer.Singleton<IViewModel, ShellViewModel>();
            subContainer.Singleton<IViewModel, EventAggregatorViewModel>();
            var subsubContainer = subContainer.CreateChildContainer();
            subsubContainer.Singleton<IViewModel, ShellViewModel>();
            subsubContainer.Singleton<IViewModel, EventAggregatorViewModel>();
        }

        public void IocTest2()
        {
            var count = subContainer.GetAllInstances<IViewModel>().Count();
            MessageBox.Show($"总共实例数量:{count}");


            var shellVM = subContainer.GetAllInstances<IViewModel>().
                FirstOrDefault(vm => vm.GetType() == typeof(ShellViewModel));
            ((ShellViewModel)shellVM).AddData();
        }

        public void IocTest3()
        {
            var shellVM = IoC.Get<SimpleContainer>().GetAllInstances<IViewModel>().
                FirstOrDefault(vm => vm.GetType() == typeof(ShellViewModel));
            ((ShellViewModel)shellVM).ShowNewWindow();
        }
运行演示:

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