Listview SmallImageList图像始终为null

Question

我有以下代码：

List<Triple<string, Image, string>> videos= new VideosInfoGrapper().GrapInfo();

listView_Preview.SmallImageList = new ImageList();
foreach (Triple<string, Image, string> videoInfo in videos)
    listView_Preview.SmallImageList.Images.Add((videoInfo.Image));


public struct Triple<T1, T2, T3>
{
    public T1 VideTitle { set; get; }
    public T2 Image { set; get; }
    public T3 VideoUrl { set; get; }

    public Triple(T1 t1, T2 t2, T3 t3)
        : this()
    {
        this.VideTitle = t1;
        this.Image = t2;
        this.VideoUrl = t3;
    }
}

视频对象中的所有图像都被正确获取，并且我在将图像添加到ImageList之前进行了调试，图像的值不为空，但是一旦图像被添加到列表中，它就变为空。