如何在ElementHost中使用Prism [英] How to use Prism within an ElementHost

问题描述

我是Prism的新手，我试图在ElementHost中托管Prisim控件.我似乎缺少一些非常基本的东西.我有一个包含ElementHost的WinForm.以下代码的格式为:

I'm new to Prism and I am attempting to host a Prisim control within an ElementHost. I seem to be missing something very basic. I have a single WinForm that contains an ElementHost. The following code is in the form:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        Bootstrapper bootstrapper = new Bootstrapper();
        bootstrapper.Run();

        var child = bootstrapper.Container.Resolve<Shell>();
        elementHost.Child = child;

    }

BootStrapper处理注册

The BootStrapper handles regisration

public class Bootstrapper : UnityBootstrapper
{
    protected override DependencyObject CreateShell()
    {
        Container.RegisterType<MyView>();
        var shell = Container.Resolve<Shell>();
        return shell;
    }

    protected override IModuleCatalog GetModuleCatalog()
    {
        ModuleCatalog catalog = new ModuleCatalog();
        catalog.AddModule(typeof(MyModule));
        return catalog;
    }
}

此时MyView.xaml仅仅是一个标签.

The MyView.xaml is nothing more than a label at this point.

Shell.xaml是一个包含以下XAML的UserControl:

Shell.xaml is a UserControl that contains the following XAML:

<ItemsControl Name="MainRegion" cal:RegionManager.RegionName="MainRegion" />

模块代码最少:

public class MyModule : IModule
{
    private readonly IRegionViewRegistry _regionViewRegistry;

    public MyModule(IRegionViewRegistry registry)
    {
        _regionViewRegistry = registry;   
    }

    public void Initialize()
    {
        _regionViewRegistry.RegisterViewWithRegion("MainRegion", typeof(MyView));
    }
}

我一直在深入探究Prism代码，试图弄清楚为什么视图从未设置到该区域中.我缺少基本的东西吗?

I've been tracing deep into the Prism code trying to figure out why the View is never set into the region. Am I missing something basic?

推荐答案

原因是Prism中的以下代码:

The reason is this code in Prism:

private static bool RegionManager::IsInDesignMode(DependencyObject element)
{
    // Due to a known issue in Cider, GetIsInDesignMode attached property value is not enough to know if it's in design mode.
    return DesignerProperties.GetIsInDesignMode(element) || Application.Current == null
        || Application.Current.GetType() == typeof(Application);
}

原因是对于非WPF应用程序，Application.Current为NULL！

The reason is that for the non-WPF application the Application.Current is NULL!

解决方案:

1. 创建一个将从System.Windows.Application继承的空类. (名称无关紧要):

在插入插件时，执行以下代码:

At the point of entry to a plug-in execute the following code:

public class MyApp : System.Windows.Application
{
}

if (System.Windows.Application.Current == null)
{
    // create the Application object
    new MyApp();
}

就这样–现在您有了一个Application.Current不为null，并且不等于typeof(Application).

This is it – now you have an Application.Current that is not null and it’s not equal to typeof(Application).

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