如何在C#的动态链接库中调用这个Delphi函数？

using System;
using System.Runtime.InteropServices;

namespace MyLibrary
{
    public class MyLibraryClass
    {
        // 声明Delphi函数的方式一：使用Delphi函数的声明文件
        [DllImport("DelphiLibrary.dll", CallingConvention = CallingConvention.StdCall)]
        public static extern int DelphiFunction(int param1, int param2);

        // 声明Delphi函数的方式二：使用DllImport特性
        [DllImport("DelphiLibrary.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "DelphiFunction")]
        public static extern int DelphiFunction2(int param1, int param2);

        public int CallDelphiFunction(int param1, int param2)
        {
            // 调用Delphi函数的方式一：使用DllImport特性声明的方式
            int result1 = DelphiFunction(param1, param2);

            // 调用Delphi函数的方式二：使用Marshal类获取Delphi函数的委托，并转换为C#的委托类型
            IntPtr functionPointer = GetDelphiFunctionPointer();
            DelphiFunctionDelegate delphiFunction = Marshal.GetDelegateForFunctionPointer<DelphiFunctionDelegate>(functionPointer);
            int result2 = delphiFunction(param1, param2);

            return result1 + result2;
        }

        private delegate int DelphiFunctionDelegate(int param1, int param2);

        private IntPtr GetDelphiFunctionPointer()
        {
            // 获取Delphi函数的指针，例如通过LoadLibrary和GetProcAddress函数获取
            // ...

            return IntPtr.Zero;
        }
    }
}