防止静态库被初始化

我有一个类，我需要与其他几个类和库连接。其中一个库需要网络摄像头。问题是这个要求是在静态(我怀疑是静态的构造函数)中完成的，这个库是二进制形式的，所以我不能编辑它。现在，如果没有网络摄像头，我不想使用这个库，但如果有，我想使用这个库。到目前为止，我所尝试的是通过在两者之间设置一个接口(像这样，除了更完整)

interface caminterface {
     void dostuff();//executes lib function
}
class cam{
     void dostuff();
}
class main{
    private caminterface;
    void start(){
    if(haswebcam())
        caminterface=new cam();
     }
}

注意所有这3个类/接口都在它们自己的文件中。但这行不通，变量一直在加载。

一个更完整的例子是:

namespace Projection
{
    using System.Diagnostics.CodeAnalysis;
    using UnityEngine;
    /// <summary>
    /// Marks which marker is used for the basis of the level by the meta one
    /// </summary>
    public class BaseForLevel : MonoBehaviour
    {
        private MetaMarkerInterface metaMarker;
        public bool activeMarkers; //we have a cam 
        public void Start()
        {
            if(this.activeMarkers){
                this.metaMarker= new MetaMarker();
                this.metaMarker.RegisterMeta();
            }
        }    
    }
using UnityEngine;
using System.Collections;
namespace Projection{
public interface MetaMarkerInterface  {
     void RegisterMeta();
     bool MoveTransformToMarker(int loc ,  Transform trans);
}
}

使用UnityEngine

;使用System.Collections;使用元;名称空间投影{

MetaMarker: MonoBehaviour, MetaMarkerInterface{//////跟踪所需的元对象///

    /// <summary>
    /// meta object required for tracking 
    /// </summary>
    private MarkerTargetIndicator marketTargetindicator;

    /// <summary>
    /// sets up the detector and marker indicator to find this marker/ 
    /// </summary>
    public void RegisterMeta(){
        this.markerdetectorGO = MarkerDetector.Instance.gameObject;
        // hide markerindicator
        this.marketTargetindicator = this.markerdetectorGO.GetComponent<MarkerTargetIndicator>();
        this.marketTargetindicator.enabled = false;
    }
    ///<summary>
    ///orignally from the metaExample script, heavily edited and returns true 
    ///if the marker was seen if it is then it also moves the object to the marker position 
    ///</summary>
    public bool MoveTransformToMarker(int id,Transform trans){
        if (!this.markerdetectorGO.activeSelf)
        {
            this.markerdetectorGO.SetActive(true);
        }
        if (MarkerDetector.Instance != null)
        {
            // check if we can see this marker 
            if (MarkerDetector.Instance.updatedMarkerTransforms.Contains(id))
            {
                // if we can then move this marker to that position 
                MarkerDetector.Instance.GetMarkerTransform(id, ref trans);
                return true;
            }
        }
        return false;
    }
}
}

namespace ConsoleApplication1
{
    using System;
    using System.Reflection;
    class Program
    {
        static void Main(string[] args)
        {
            var DLL = Assembly.LoadFile(@"C:'visual studio 2013'Projects'ConsoleApplication1'ConsoleApplication1'DLL.That.Keeps.Crashing.dll");
            foreach(Type type in DLL.GetExportedTypes())
            {
                dynamic c = Activator.CreateInstance(type);
                //Call a method on the loaded type dynamically
                c.Output(@"Hello");
            }
            Console.ReadLine();
        }
    }
}