使用opentk.openal在简单程序中的异常

Question

Where the code initially came from

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using OpenTK;
using OpenTK.Audio.OpenAL;

namespace OpenTK_OpenAL
{
    class Program
    {
        static unsafe void Main(string[] args)
        {
            IntPtr device = Alc.OpenDevice(null);
            ContextHandle context = Alc.CreateContext(device, (int*)null);

            Alc.MakeContextCurrent(context);

            string version = AL.Get(ALGetString.Version);
            string vendor = AL.Get(ALGetString.Vendor);
            string renderer = AL.Get(ALGetString.Renderer);
            Console.WriteLine(version);
            Console.WriteLine(vendor);
            Console.WriteLine(renderer);
            Console.ReadKey();
        }
    }
}

我正在查看上面的链接并编写了一个程序，但程序不起作用。我可以得到一个为什么这不起作用的建议吗？代码的最开头有一个例外，IntPtr device = Alc.OpenDevice(null);。