问使用UnmanagedExports包[DllExport]调用VBA触发器中的C# DLL“无法找到DLL入口点”错误

EN

namespace MyNamespace
{
    public static class UnmanagedExports
    {
        //entry point for dll
        static UnmanagedExports()
        {
            //nothing
        }


        [DllExport("HelloWorld", CallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl)]
        public static string HelloWorld()
        {
            return "Hello World";
        }

        [DllExport("MyDLLFunction", CallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl)]
        [return: MarshalAs(UnmanagedType.IDispatch)]
        static object MyDLLFunction()
        {
            return new InnerNamespace.MyCsharpClass();
        }
    }

}

namespace MyNamespace.InnerNamespace
{
    [ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual)]
    public class MyCsharpClass
{
        [return: MarshalAs(UnmanagedType.BStr)]
        public async Task<string> InnerFunction(string LookupType, string LookupNumber)
        {
            object Response = await GetResponseAsync(LookupType, LookupNumber);
            string ResultAsString = Response.ToString();
            return ResultAsString;
        }
}

Private Declare PtrSafe Function AddDllDirectory Lib "kernel32" (ByVal lpLibFileName As String) As Integer
Public Declare PtrSafe Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As LongPtr
Public Declare PtrSafe Function MyDLLFunction Lib "C:\my\long\path\to\my\project\bin\x64\Debug\net472\myDllName.dll" () As Object

Sub Test()
  Dim mObj As Object
  Set mscObj = MyDLLFunction()  //run time error here <- can't find entry point
End Sub