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我正在开发一个需要允许 3rd-party 插件的项目。我以前使用过插件，但从来没有遇到过问题。

我确定我的问题是因为 WPF 不喜欢我使用 Assembly.LoadFile(file) 和 Activator.CreateInstance(t)！

我遇到的错误是：

The component 'Servus.Forms.MainWindow' does not have a resource identified by the URI '/Servus;component/forms/mainwindow.xaml'.

这显示在我的 MainForm 构造函数中： InitializeComponent();

如果我在加载 MainForm 后加载插件，它会毫无问题地加载，但是当打开任何其他表单（我的应用程序中有很多）时，我会遇到与 about 相同的问题，但该特定表单会出现相关错误。

我也尝试在自己的 AppDomain 中加载插件，如下所示：

PluginDomain temp = new PluginDomain();
PluginBase tempPlug = temp.GetPlugin(file);

有以下课程：

public class PluginDomain
{
    public AppDomain CurrentDomain { get; set; }
    public ServusAssemblyLoader CurrentAssemblyLoader { get; set; }

    private readonly Random _rand = new Random();

    public PluginDomain()
    {
    }


    public PluginBase GetPlugin(string assemblyName)
    {
        try
        {
            string appBase = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            var ads = new AppDomainSetup { ApplicationBase = appBase, PrivateBinPath = appBase, ShadowCopyFiles = "true" };
            CurrentDomain = AppDomain.CreateDomain("ServusDomain_Plugin_" + _rand.Next(0, 100000), null, ads);

            AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;
            CurrentAssemblyLoader = (ServusAssemblyLoader)
            CurrentDomain.CreateInstanceAndUnwrap(Assembly.GetExecutingAssembly().FullName, typeof(ServusAssemblyLoader).FullName);

            AppDomain.CurrentDomain.AssemblyResolve -= CurrentDomain_AssemblyResolve;

            return CurrentAssemblyLoader.Load(assemblyName);
        }
        catch (Exception e)
        {
            CConsole.WriteLine("Error: " + e.Message);
        }
        finally
        {
            CurrentAssemblyLoader = null;
            AppDomain.Unload(CurrentDomain);
        }

        return null;
    }

    static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
    {
        string[] parts = args.Name.Split(',');
        string file = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + "\\" + parts[0].Trim() + ".dll";

        return Assembly.LoadFrom(file);
    }
}

public class ServusAssemblyLoader : MarshalByRefObject, IAssemblyLoader
{
    public PluginBase Load(string file)
    {
        Assembly asm = Assembly.LoadFrom(file);

        foreach (Type t in asm.GetTypes())
        {
            if (t.IsSubclassOf(typeof(PluginBase)))
            {
                return (PluginBase)Activator.CreateInstance(t);
            }
        }

        return null;
    }
}

public interface IAssemblyLoader
{
    PluginBase Load(string file);
}

这将返回一个透明代理对象，如下所示：

{System.Runtime.Remoting.Proxies.__TransparentProxy}

但是我不确定如何使用它，因为我希望它返回一个 PluginBase 对象。

我读过很多人也有这个问题，他们的答案说要使用新的 AppDomain，但正如你所看到的，这对我现在没有帮助。

我希望我已经为您提供了足够的信息，有人可以帮忙吗？

4

1 回答 1

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It turns out I had a few things wrong in my PluginDomain Class.

Fix #1:

Replace:

return (PluginBase)Activator.CreateInstance(t);

With:

(PluginBase)asm.CreateInstance(t.ToString());

Fix #2:

Remove:

AppDomain.Unload(CurrentDomain);

Fix #3: (Purely for debugging)

Replace:

return CurrentAssemblyLoader.Load(assemblyName);

With:

PluginBase obj = CurrentAssemblyLoader.Load(assemblyName);
return obj;

EDIT:

It should be noted that the new AppDomain wont be able to access objects in the old one; so my problem is only half fixed.

于 2013-02-21T18:01:08.893 回答