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

我已经创建usercontrol实例到单独的appdomain并将其转换为INativeHandleContract作为每个插件框架指南，我能够将框架实例的引用传递到主机应用程序域。当我将主体应用程序appdomain中的INativeHandleContract转换回UIElement时，我无法将UIElement转换为我的自定义接口类型。

任何人都可以告诉我是否可以将Framework元素转换为userControl或将其转换为我的自定义界面？

这里是代码的一部分：

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"); 
     ... 
    } 

我的目标是在调用自定义的接口定义了一些方法，通过我已经装在装配的类型之一来实现。

问候 蒂霍米尔Blagoev

Answer 1

我找到了解决办法！正如here所述，“由于主机应用程序获取HwndHost，主机应用程序无法将由ContractToViewAdapter返回的对象转换为它通过加载项实现的类型（例如UserControl）。”

所以，如果我想在我的子域到达类型实例，我已经通过我的代理做到这一点：

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); 
    } 
}