当我在 VBA 中使用 C# 回调函数时，它会显示"entry point not found "

我想在VBA中使用C#回调函数。但当我调用C#函数时，它显示"未找到入口点"

我该怎么修？感谢

PS：我检查了使程序集COM可见并注册COM内部环境：MS Office Excel 2007、MS Visual Studio 2008

VBA代码：

Declare Function Result Lib"C:UsersadminDesktopmyprogNew_DLL_TestNew_DLL_TestbinDebugNew_DLL_Test.dll" Alias "Msg" (ByVal p As Long) As Integer
Function Disp()
   MsgBox x
End Function
Sub AddResult(ByVal p As Long)
    Dim x As Long   
    x = Result(p)
    Debug.Print x
End Sub
Sub testnow_Click()
    Call AddResult(AddressOf Disp)
End Sub

C#代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace New_DLL_Test
{
    [Guid("f1286974-0f1a-466c-8389-dd1ab7e3eed2"), InterfaceType(ComInterfaceType.InterfaceIsDual)]
    interface Msginterface
    {
        int Msg;
    }
    public unsafe class MsgProcess
    {
        public int Msg(int* p)
        {
           return add(p,1);
        }
        public int add(int* p, int j)
        {
            return j+1;
        }
    }
}