通過反射從加載的程序集中返回Types []時，FileNotFound

Question

我正在嘗試加載加載項程序集（放置在

D：\\ xyz \\ addin.dll

當我的應用程序在

D：\\ MyApp \\ MyApp.exe

這樣，不應鎖定插件文件，以便可以在應用程序運行時再次復制它的新版本。 為此，我創建了新的應用程序域並加載了包含AssembltLoader類的通用dll，然后調用AssemblyLoader加載了插件並獲取了所有可用的類型。 Addin dll的依賴項已放置在同一文件夾中。 現在從加載項dll獲取類型工作正常，但是當我

返回assembly.GetTypes（）;

一件非常奇怪的事情發生了。 它執行該行，但在該函數退出時會引發異常“ d：\\ xyz \\ addin.dll” FileNotFound

public class ObjectLoader : IDisposable
{
    public Type[] GetAllTypesFromAssembly(string filePath)
    {
        AppDomainSetup setup = new AppDomainSetup();
        setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
        setup.ShadowCopyFiles = "true";
        Evidence adevidence = AppDomain.CurrentDomain.Evidence;

        AssemblyLoader asemblyLoader = null;

        AppDomain appDomain = AppDomain.CreateDomain(filePath, adevidence, setup);

        appDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);

        domains.Add(filePath, appDomain);
        object[] parms = { filePath };

        BindingFlags bindings = BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public;
        try
        {
            asemblyLoader = (AssemblyLoader)appDomain.CreateInstanceFromAndUnwrap(
            setup.ApplicationBase +
            "Common.dll", "Common.AssemblyLoader", 
            true, bindings, null, parms, null, null, null
            );
        }
        catch (Exception ex)
        {
            throw ex; // new AssemblyLoadFailureException();
        }

        object types = null;
        if (asemblyLoader != null)
        {
            // On following line i am facing the error which occur on following line but when GetAllTypes exits. 
            types = asemblyLoader.GetAllTypes();
         }
         return (Type[])types;
     }
}

internal class AssemblyLoader : MarshalByRefObject, IDisposable
{
    private Assembly assembly = null;
    public object GetAllTypes()
    {
        BindingFlags flags = BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public;
        object types = null;
        if (assembly != null)
        {
            try
            {
                // following line works fine and loads a type (it contains one class)
                types = assembly.GetTypes(); 
            }
            catch (Exception)
            {
                types = new ObjectLoadFailureException();
            }
        }
        else
        {
            types = new AssemblyNotLoadedException();
        }
        return types;
    }
}

這是異常詳細信息：

System.IO.FileNotFoundException was unhandled
HResult=-2147024894
Message=Could not load file or assembly 'AddIn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
  Source=mscorlib
  FileName=AddIn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
  FusionLog==== Pre-bind state information ===
LOG: DisplayName = AddIn, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///D:/MyApp/
LOG: Initial PrivatePath = NULL
Calling assembly : (Unknown).

如果我同時在D：\\ xyz \\和D：\\ MyApp \\中復制我的addin.dll，則沒有錯誤。 我無法在運行時環境中執行此操作。

Answer 1

您正在將Type對象編組到主AppDomain中。
這將導致CLR加載包含該AppDomain中的類型的程序集，從而導致此錯誤。

您可能根本不應該使用AppDomain。