封送 C# 结构数组并在 COM 中使用它 - 什么是正确的封送处理属性

我面临以下问题将近一周：我有一个需要发送到COM应用程序的c#结构数组。但是当我调用COM方法时，我得到以下内容

error： System.Runtime.InteropServices.MarshalDirectiveException' 发生

其他信息：无法封送"参数 #5"：无效 托管/非托管类型组合(Int/UInt 必须与 SysInt 或 SysUInt(。

IDL 文件使用 C# 接口进行扩展/派生。

以下是 IDL 中定义的方法：

[helpstring("Method MyCallbackMehtod")]
    HRESULT MyRequestFinished(
        [in] long    callId,
        [in] unsigned int nrElemArray1,
        [in, size_is(nrElemArray1)] MyStruct ElemArray1[],
        [in] unsigned int nrElemArray2,
        [in, size_is(nrElemArray2)] MyStruct ElemArray2[]
);

c# 接口：

 [ComImport, Guid("xxxxxxxx-xxxx-xxxx-xxx-xxxxxxxxxx")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IMyInterface
    {
        void MyRequestFinished(
            [In] 
            long callId,
            [In] 
            uint nrElemArray1,
            [In,MarshalAs(UnmanagedType.LPArray,SizeParamIndex=1)] 
            IntPtr ElemArray1,
            [In]
            uint nrElemArray2,
            [In, MarshalAs(UnmanagedType.LPArray,SizeParamIndex = 3)]  
            IntPtr ElemArray2);
}

MyStruct 的定义是：

[StructLayout(LayoutKind.Sequential,Pack=1)]
    public struct MyStruct
    {
        public double setValue;
        public double actualValue;
        [MarshalAs(UnmanagedType.I4)]
        public MyEnum myResult;
    }
    [ComVisible(true)]
    public enum MyEnum 
    {
        Val1,
        Val2,
        Val3
    }

调用对 COM 方法的调用的代码段：

IntPtr pMyElemArray1  = IntPtr.Zero;
IntPtr pMyElemArray2 = IntPtr.Zero;
MyStruct[] MyElemArray1= GetArray1();
MyStruct[] MyElemArray2= GetArray2();
int lengthElemArray1= MyElemArray1.Length;
int lengthElemArray2= MyElemArray2.Length;
pMyElemArray1 = Marshal.AllocCoTaskMem(Marshal.SizeOf(MyElemArray1[0]) * lengthElemArray1);
pMyElem2 = Marshal.AllocCoTaskMem(Marshal.SizeOf(MyElemArray2[0]) * lengthElemArray2);
int rundef = (int)pMyElemArray1 ;
for (int i = 0; i < lengthElemArray1; i++)
{
     Marshal.StructureToPtr(MyElemArray1 [i], (IntPtr)rundef, false);
     rundef += Marshal.SizeOf(MyElemArray1[i]);
}
rundef = (int)pMyElemArray2;
for (int i = 0; i < lengthElemArray2; i++)
{
    Marshal.StructureToPtr(MyElemArray2[i], (IntPtr)rundef, false);
    rundef += Marshal.SizeOf(MyElemArray2[i]);
}
// Notify COM component
//here i get the error
  myComObject.MyRequestFinished(callId,
                       ((uint)lengthElemArray1),
                       pMyElemArray1,
                       ((uint)lengthElemArray2),
                       pMyElemArray2);
//....
}

void MyRequestFinished(
    [In]
    long callId,
    [In]
    uint nrElemArray1,
    [In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)]
    MyStruct[] ElemArray1,
    [In]
    uint nrElemArray2,
    [In]  
    IntPtr ElemArray2);
}