图片加载不出来可以用下面这种形式，就不用在方法里面传参数了；

private void OnLoadSpriteTest1(string path, object obj, object param1 = null, object param2 = null, object param3 = null)
    {
        if (obj != null)
        {
            Texture2D texture = obj as Texture2D;
            Sprite sprite = Sprite.Create(texture, new Rect(0,0,texture.width,texture.height),new Vector2(1f,1f));
            m_MainPanel.Test1.sprite = sprite;
            Debug.Log("图片1已加载");
        }
    }

测试可以加载出来