基于AppDomain应用程序域的“热拔插”

public class Loader : MarshalByRefObject
{
    // Methods
    public object LoadObject(string dllName, string typeName)
    {
        return Assembly.LoadFrom(dllName).CreateInstance(typeName);
    }

  　　public T GetInstance<T>(string typeName) where T : class
        {
            if (remoteLoader == null) return null;
            return remoteLoader.GetInstance<T>(typeName);
        }

        public void ExecuteMothod(string typeName, string methodName)
        {
            remoteLoader.ExecuteMothod(typeName, methodName);
        }

}
public class ForeignLoader
{
    // Fields
    private Hashtable htAppDomain = new Hashtable();

    // Methods
    public object LoadObject(string dllName, string typeName)
    {
        lock (this)
        {
            if ((dllName == null) || (typeName == null))
            {
                return null;
            }
            AppDomain domain = (AppDomain) this.htAppDomain[dllName];
            if (domain == null)
            {
                AppDomainSetup info = new AppDomainSetup();
                info.ShadowCopyFiles = "true";
                domain = AppDomain.CreateDomain(dllName, null, info);
                this.htAppDomain.Add(dllName, domain);
            }
            Loader loader = (Loader) domain.CreateInstanceFromAndUnwrap("ESBase.dll", "ESBase.Advanced.Loader");
            return loader.LoadObject(dllName, typeName);
        }
    }

    public object LoadObject(AppDomain destDomain, string dllName, string typeName)
    {
        if (((destDomain == null) || (dllName == null)) || (typeName == null))
        {
            return null;
        }
        Loader loader = (Loader) destDomain.CreateInstanceFromAndUnwrap("ESBase.dll", "ESBase.Advanced.Loader");
        return loader.LoadObject(dllName, typeName);
    }

    public void Unload(string dllName)
    {
        lock (this)
        {
            AppDomain domain = (AppDomain) this.htAppDomain[dllName];
            if (domain != null)
            {
                AppDomain.Unload(domain);
                this.htAppDomain.Remove(dllName);
            }
        }
    }
}

 -------------------------AssemblyDynamicLoader其他同学的方法-------------------

public class AssemblyDynamicLoader
    {
        private AppDomain appDomain;
        private RemoteLoader remoteLoader;
        public AssemblyDynamicLoader()
        {
            AppDomainSetup setup = new AppDomainSetup();
            setup.ApplicationName = "ApplicationLoader";   
            setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory; 
            setup.PrivateBinPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "private");
            setup.CachePath = setup.ApplicationBase;
            setup.ShadowCopyFiles = "true";
            setup.ShadowCopyDirectories = setup.ApplicationBase;
            AppDomain.CurrentDomain.SetShadowCopyFiles();
            this.appDomain = AppDomain.CreateDomain("ApplicationLoaderDomain", null, setup);
            String name = Assembly.GetExecutingAssembly().GetName().FullName;
            this.remoteLoader = (RemoteLoader)this.appDomain.CreateInstanceAndUnwrap(name, typeof(RemoteLoader).FullName);
        }

        public void LoadAssembly(string assemblyFile)
        {
            remoteLoader.LoadAssembly(assemblyFile);
        }

        public T GetInstance<T>(string typeName) where T : class
        {
            if (remoteLoader == null) return null;
            return remoteLoader.GetInstance<T>(typeName);
        }

        public void ExecuteMothod(string typeName, string methodName)
        {
            remoteLoader.ExecuteMothod(typeName, methodName);
        }

        public void Unload()
        {
            try
            {
                if (appDomain == null) return;
                AppDomain.Unload(this.appDomain);
                this.appDomain = null;
            }
            catch (CannotUnloadAppDomainException ex)
            {
                throw ex;
            }
        }
    }
这样我们每次都是通过AssemblyDynamicLoader类进行跨域的访问.

AppDomain.CurrentDomain.SetShadowCopyFiles();
            this.appDomain = AppDomain.CreateDomain("ApplicationLoaderDomain", null, setup);
            String name = Assembly.GetExecutingAssembly().GetName().FullName;
            this.remoteLoader = (RemoteLoader)this.appDomain.CreateInstanceAndUnwrap(name, typeof(RemoteLoader).FullName);