如何在模块的构造函数中发布事件？

Question

当我尝试在我的客户模块中发布事件时，它不起作用（订阅者没有收到对象，不显示任何内容）：

 public class CustomersRegister : IModule
    {
        private static IRegionManager regionManager;
        private static IRegion region;
        private static CustomersMainView view;
        private static CustomerAllView allview;
        private static CustomerEdit editView;

        public CustomersRegister(IRegionManager manager)
        {
            regionManager = manager;
        }

        public void Initialize()
        {
            StackPanel sp = LoadNavigation();
            sp.PublishEvent(PublishEventNames.AddCustomerMenu);
        }

        public static StackPanel LoadNavigation()
        {
            StackPanel sp = new StackPanel();
            sp.Margin = new Thickness { Left = 10.0, Top = 5.0, Right = 10.0 };
            sp.Children.Add(new CustomerMainMenu());
            return sp;
        }

但是，如果我执行此解决方案，以便将视图加载到调用viewmodel 中的命令，它发布事件，然后我停用视图，然后它就可以工作：

public class CustomersRegister : IModule
{
    private static IRegionManager regionManager;
    private static IRegion region;
    private static CustomersMainView view;
    private static CustomerAllView allview;
    private static CustomerEdit editView;

    public CustomersRegister(IRegionManager manager)
    {
        regionManager = manager;
    }

    public void Initialize()
    {
        region = regionManager.Regions[RegionNames.DockManagerContainer];
        view = new CustomersMainView();
        view.DataContext = new ViewModels.CustomersMainViewModel();
        region.Add(view);
        region.Activate(view);
    }

View:

<UserControl x:Class="CustomersModul.Views.CustomersMainView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ncal="http://infragistics.com/ncal"
    xmlns:Commands="clr-namespace:CRMInfrastructure.Commands;assembly=CRMInfrastructure"
    ncal:XamDockManagerSettings.IsContentPaneInDocumentHost="True"              
    Commands:AvarioCommandBehavior.TheCommandToRun="{Binding LoadNavigation}"
    Commands:AvarioCommandBehavior.RoutedEventName="Loaded"
    Commands:AvarioCommandBehavior.CommandParameter="loading">
...

ViewModel:

using System.Windows.Input;
using CRMInfrastructure;
using CRMInfrastructure.Commands;
using CRMInfrastructure.Helpers;

namespace CustomersModul.ViewModels
{
  public class CustomersMainViewModel : ViewModelBase
  {
    public ICommand LoadNavigation { get; set; }

    public CustomersMainViewModel()
    {
      LoadNavigation = new DelegateCommand<object>(load);
    }

    void load(object o)
    {
        CustomersNavigation.LoadNavigation().PublishEvent(PublishEventNames.AddCustomerMenu);
        CustomersRegister.DeactivateView();
    }
  }
}

我怎样才能简单地在构造函数中发布事件模块而不是做这个奇怪的解决方法？

Answer 1

在我看来，您的 StackPanel 变量在事件传播之前就超出了范围。 这可以解释为什么当您将 ViewModel 加载到该区域并使用对发布方法的静态调用时，行为会有所不同。

尝试在 IModule 类中为 StackPanel 创建一个类级实例变量。