c＃中的Marshal.GetComInterfaceForObject返回E_INVALIDARG错误消息

Question

我尝试创建一个使用COM接口消耗插件的程序。

我实现了IClassFactory接口来创建插件实例。 CreateInstance-Method以这种方式实现：

(table1 JOIN table2) UNION (table1 JOIN table3)

public int CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject) { MessageBox.Show("TestClassFactory CreateInstance"); ppvObject = IntPtr.Zero; if (pUnkOuter != IntPtr.Zero) { // The pUnkOuter parameter was non-NULL and the object does // not support aggregation. Marshal.ThrowExceptionForHR(ComNative.CLASS_E_NOAGGREGATION); } if (riid == new Guid(ManagerGuids.ClassId) || riid == new Guid(ComNative.IID_IDispatch) || riid == new Guid(ComNative.IID_IUnknown)) { MessageBox.Show("Pre GetComInterfaceForObject"); // Create the instance of the .NET object // The container has to be passed as property and not by constructor injection. // This is because COM (de-)registration needs a constructor without parameters. ppvObject = Marshal.GetComInterfaceForObject(new NetPlugin(), typeof(INetPlugin)); MessageBox.Show("Post GetComInterfaceForObject"); } else { // The object that ppvObject points to does not support the // interface identified by riid. Marshal.ThrowExceptionForHR(ComNative.E_NOINTERFACE); } return WinError.S_OK; } 的调用返回无效参数错误（E_INVALIDARG）。

方法的论点：

NetPlugin：

Marshal.GetComInterfaceForObject(new NetPlugin(), typeof(INetPlugin));

INetPlugin：

[ClassInterface(ClassInterfaceType.None)]
[Guid(ManagerGuids.ClassId)]
[ComVisible(true)]
public class NetPlugin : INetPlugin
{
    public NetPlugin()
        {

        }

        [ComVisible(true)]
        [DispIdAttribute(0x1)]
        public String LastParameters
        {
            get { return ""; }
            set { }
        }

        [ComVisible(true)]
        [DispIdAttribute(0x2)]
        public String Vendor
        {
            get { return "Company"; }
            set { }
        }


        [ComVisible(true)]
        [DispIdAttribute(0x3)]
        public String Description
        {
            get { return "Test plugin written in .NET"; }
            set { }
        }


        [ComVisible(true)]
        [DispIdAttribute(0x4)]
        public String Version
        {
            get { return "1.0"; }
            set { }
        }


        [ComVisible(true)]
        [DispIdAttribute(0x5)]
        public String Category
        {
            get { return "Void"; }
            set { }
        }


        [ComVisible(true)]
        [DispIdAttribute(0x6)]
        public String MenuEntry
        {
            get { return "NetPlugin"; }
            set { }
        }

        [ComVisible(true)]
        [DispIdAttribute(0x7)]
        public String MessageString
        {
            get { return "NetPlugin"; }
            set { }
        }


        [ComVisible(true)]
        [DispIdAttribute(0x8)]
        public String TooltipText
        {
            get { return "Tooltip NetPlugin"; }
            set { }
        }

        [ComVisible(true)]
        [DispIdAttribute(0x9)]
        public String FriendlyName
        {
            get { return "NetPlugin FFFFF Friendly"; }
            set { }
        }

        [ComVisible(true)]
        [DispIdAttribute(0xa)]
        public String BitmapResourceSmall
        {
            get { return "BitmapResourceSmall.bmp"; }
            set { }
        }


        [ComVisible(true)]
        [DispIdAttribute(0xb)]
        public String BitmapResourceLarge
        {
            get { return "BitmapResourceLarge.bmp"; }
            set { }
        }

        [ComVisible(true)]
        [DispIdAttribute(0xc)]
        public String Key
        {
            get { return ""; } // must be empty 
            set { }
        }

        [ComVisible(true)]
        [DispIdAttribute(0xd)]
        public String Reserved
        {
            get { return "Void"; }
            set { }
        }



        [ComVisible(true)]
        [DispIdAttribute(0xe)]
        public Int32 Run()
        {
            //-- Return scode
            return 0;
        }
}

NetPlugin以这种方式注册：

[Guid(ManagerGuids.InterfaceId), ComVisible(true)]
interface INetPlugin
{
    [DispId(0x1)]
    String LastParameters { get; set; }

    [DispId(0x2)]
    String Vendor { get; set; }

    [DispId(0x3)]
    String Description {get; set; }

    [DispId(0x4)]
    String Version { get; set; }

    [DispId(0x5)]
    String Category { get; set; }

    [DispId(0x6)]
    String MenuEntry { get; set; }

    [DispId(0x7)]
    String MessageString { get; set; }

    [DispId(0x8)]
    String TooltipText { get; set; }

    [DispId(0x9)]
    String FriendlyName { get; set; }

    [DispId(0xa)]
    String BitmapResourceSmall { get; set; }

    [DispId(0xb)]
    String BitmapResourceLarge { get; set; }

    [DispId(0xc)]
    String Key { get; set; }

    [DispId(0xd)]
    String Reserved { get; set; }

    [DispId(0xe)]
    Int32 Run();
}

INetPlugin以这种方式注册：

RegistrationServices rs = new RegistrationServices();
bool b = rs.RegisterAssembly(System.Reflection.Assembly.GetExecutingAssembly(), AssemblyRegistrationFlags.SetCodeBase);

if (!b)
    return 998;

String exePath = new Uri(System.Reflection.Assembly.GetExecutingAssembly().CodeBase).LocalPath;
                Registry.SetValue(@"HKEY_CLASSES_ROOT\CLSID\{" + ManagerGuids.ClassId + @"}\LocalServer32", "", exePath);

我会非常感谢任何帮助！