无法将 'MS.Internal.Controls.AddInHost' 转换回类型 'System.Windows.Controls.UserControl' 或将其转换为我的自定义界面

Question

我已将用户控件实例创建到单独的应用程序域中，并根据插件框架指南将其转换为 INativeHandleContract，并且我能够将框架实例的引用传递到主机应用程序域中。当我在主机应用程序应用程序域中将 INativeHandleContract 转换回 UIElement 时，我无法将 UIElement 转换为我的自定义接口类型。

谁能告诉我是否可以将 Framework 元素转换为 userControl 或将其转换为我的自定义界面？

这是代码的一部分：

public INativeHandleContract GetControl(string AssemblyName, string strFullNamespaceName)
    {
        var assembly = Assembly.LoadFrom(m_strAssemblyDirectory + AssemblyName);
        var type1 = typeof(IUPiAssemblyProcedure);
        var type2 = typeof(IUPiCardProcedure);
        var type3 = typeof(IUPiDatabaseFrame);
        var type4 = typeof(IUPiUserFrame);
        var t = from T in assembly.GetTypes() where type1.IsAssignableFrom(T) || type2.IsAssignableFrom(T) || type3.IsAssignableFrom(T) || type4.IsAssignableFrom(T) select T;
        if (t.Count<Type>() == 0) return null;
        var tName = t.First<Type>().FullName;
        return FrameworkElementAdapters.ViewToContractAdapter((FrameworkElement)assembly.CreateInstance(tName));
    }

public void LoadUserControl(INativeHandleContract contract)
    {
        var uControl = FrameworkElementAdapters.ContractToViewAdapter(contract);

        var t = uControl.GetType();
        t.GetMethod("methodName");
        ...
    }

我的目标是调用自定义接口中定义的一些方法，由我加载的程序集中的一种类型实现。

问候蒂霍米尔·布拉戈耶夫

Answer 1

我找到了解决办法！正如所描述的 here、"Because the host application gets an HwndHost, the host application cannot convert the object that is returned by ContractToViewAdapter to the type it is implemented as by the add-in (for example, a UserControl)."

因此，如果我想访问我的子域中的类型实例，我必须通过我的代理来完成：

public class Main
{
    private AppDomain ad = null;
    private proxy remoteWorker = null;

    public INativeHandleContract LoadAssembly(string assemblyname, string fullInterfaceName)
    {
        if (ad != null)
        {
            AppDomain.Unload(ad);
        }
        var domSetup = new AppDomainSetup();

        domSetup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
        domSetup.PrivateBinPath = AppDomain.CurrentDomain.BaseDirectory;
        domSetup.ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
        domSetup.LoaderOptimization = LoaderOptimization.MultiDomainHost;
        var adevidence = AppDomain.CurrentDomain.Evidence;

        ad = AppDomain.CreateDomain(assemblyname, adevidence, domSetup);

        ad.AssemblyResolve += ad_AssemblyResolve;
        AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

        remoteWorker = (proxy)ad.CreateInstanceAndUnwrap(typeof(proxy).Assembly.FullName, "INATO.UPINAIS.UCLibrary.proxy");
        return remoteWorker.GetControl(assemblyname, fullInterfaceName);
    }

    public void DoTheTrick()
    {
        var uControl = LoadAssembly("assemblyName", "interfaceName");
        panel.Content = FrameworkElementAdapters.ContractToViewAdapter(uControl);
        remoteWorker.RemoteInvoke("methodName", new object[] { });
    }
}

public class proxy : MarshalByRefObject
{
    private object _currentInstance;

    public INativeHandleContract GetControl(string AssemblyName, string strFullNamespaceName)
    {
        var assembly = Assembly.LoadFrom(m_strAssemblyDirectory + AssemblyName);
        var type1 = typeof(IUPiAssemblyProcedure);
        var type2 = typeof(IUPiCardProcedure);
        var type3 = typeof(IUPiDatabaseFrame);
        var type4 = typeof(IUPiUserFrame);
        var t = from T in assembly.GetTypes() where type1.IsAssignableFrom(T) || type2.IsAssignableFrom(T) || type3.IsAssignableFrom(T) || type4.IsAssignableFrom(T) select T;
        if (t.Count<Type>() == 0) return null;
        var tName = t.First<Type>().FullName;
        _currentInstance = assembly.CreateInstance(tName);
        return FrameworkElementAdapters.ViewToContractAdapter((FrameworkElement)_currentInstance);
    }

    public void RemoteInvoke(string methodName, object[] parameters)
    {
        var type = _currentInstance.GetType();
        var mi = type.GetMethod(methodName);
        mi.Invoke(_currentInstance, parameters);
    }
}

无法将 'MS.Internal.Controls.AddInHost' 转换回类型 'System.Windows.Controls.UserControl' 或将其转换为我的自定义界面

Unable to convert 'MS.Internal.Controls.AddInHost' back to type 'System.Windows.Controls.UserControl' or cast it to my custom interface

c#

wpf

add-in

uielement