System.Html.CanvasElement.GetContext C# (CSharp) Method

        public CanvasRenderingContext GetContext(CanvasContextId contextId)
        {
            return null;
        }

        public void Run()
        {
            _backgroundImageElement = Document.GetElementById("backgroundImage").As<ImageElement>();
            _imageStripElement = Document.GetElementById("imageStrip").As<ImageElement>();
            _tankCanvas = Document.GetElementById("fishTankCanvas").As<CanvasElement>();
            _fishesCanvas = Document.GetElementById("fishesCanvas").As<CanvasElement>();

            Debug.Assert(_backgroundImageElement != null);
            Debug.Assert(_imageStripElement != null);
            Debug.Assert(_tankCanvas != null);
            Debug.Assert(_fishesCanvas != null);

            _tankCanvasContext = (CanvasContext2D)_tankCanvas.GetContext(Rendering.Render2D);
            _fishesCanvasContext = (CanvasContext2D)_fishesCanvas.GetContext(Rendering.Render2D);

            _fishes = new List<Fish>();
            for (int i = 0; i < FishTank.FishCount; i++) {
                double x = Math.Floor(Math.Random() * (_width - FishTank.FishWidth) + FishTank.FishWidth / 2);
                double y = Math.Floor(Math.Random() * (_height - FishTank.FishHeight) + FishTank.FishHeight / 2);
                double z = Math.Floor(Math.Random() * (FishTank.ZFar - FishTank.ZNear));

                _fishes.Add(new Fish(this, x, y, z, _imageStripElement, _fishesCanvasContext));
            }

            OnWindowResize(null);
            Window.AddEventListener("resize", OnWindowResize, false);

            _tickHandler = OnTick;
            QueueUpdate();
        }