C# System.Reflection.Assembly动态加载资源文件

 try
            {
                if (stateColour < 0) return null;
                System.Reflection.Assembly dll = System.Reflection.Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + "WeGanttGmTask.dll");
                string _stateName = GetEnumStrByNum(stateColour);
                _stateName = taskName + _stateName; //图片的名称
                ResourceManager resourceManager = new ResourceManager(dll.GetName().Name + ".Properties.Resources",dll );
                object obj = resourceManager.GetObject(_stateName);
                if (obj == null) return new Bitmap(22, 16);
                Image img = ((System.Drawing.Bitmap)(obj));
                return img;
            }
            catch(Exception e)
            {
                throw e;
            }