CSharp Objekte !zufällig! sichtbar machen

        enum Pos
        {
            HourFirst,
            HourLast,
            MinuteFirst,
            MinuteLast
        }

        private int getPointsToDraw(int charOfTime)
        {
            int pointsToDraw = 0;

            switch (charOfTime)
            {
                case (int)Pos.HourFirst:
                        pointsToDraw = DateTime.Now.Hour / 10;
                    break;
                case (int)Pos.HourLast:
                        pointsToDraw = DateTime.Now.Hour % 10;
                    break;
                case (int)Pos.MinuteFirst:
                    pointsToDraw = DateTime.Now.Minute / 10;
                    break;
                case (int)Pos.MinuteLast:
                    pointsToDraw = DateTime.Now.Minute % 10;
                    break;
            }
            return pointsToDraw;
        }

        private ArrayList randomizePositions(int numberofpositions, int numberofshownrecs)
        {
            Random rand = new Random(DateTime.Now.Millisecond);
            ArrayList positions = new ArrayList();
            int tmp = 0;

            //get random position(s) for this field
            for (int i = 0; i < numberofshownrecs; i++)
            {
                while (true)
                {
                    tmp = rand.Next(0, numberofpositions);
                    if (!positions.Contains(tmp))
                    {
                        positions.Add(tmp);
                        break;
                    }
                }
            }

            return positions;
        }

        private void draw()
        {
            ArrayList positions = new ArrayList();

            //fields for first char of hours ( 1*3 field )
            positions = randomizePositions(3, getPointsToDraw((int)Pos.HourFirst));
            for (int i = 0; i < positions.Count; i++)
            {
                g.FillRectangle(Brushes.Red, new Rectangle(_HOURSPOS_X,
                    (int)positions[i] *(_HEIGHT+_PLACEBETWEENITEMS)+_HOURSPOS_Y, 
                    _WIDTH, 
                    _HEIGHT));
            }

            //fields for the second char ( 3*3 field )
            positions = randomizePositions(9, getPointsToDraw((int)Pos.HourLast));
            for (int i = 0; i < positions.Count; i++)
            {
                g.FillRectangle(Brushes.Orange, 
                    new Rectangle(_HOURSPOS_X + (_WIDTH + _PLACEBETWEENITEMS) + ((int)positions[i] / 3 * (_WIDTH + _PLACEBETWEENITEMS)),
                    (int)positions[i] % 3 * (_HEIGHT + _PLACEBETWEENITEMS) + _HOURSPOS_Y, 
                    _WIDTH, 
                    _HEIGHT
                    ));
            }

            //fields for the third char ( 2*3 field )
            positions = randomizePositions(6, getPointsToDraw((int)Pos.MinuteFirst));
            for (int i = 0; i < positions.Count; i++)
            {
                g.FillRectangle(Brushes.Black,
                    new Rectangle(_HOURSPOS_X + 4 * (_WIDTH + _PLACEBETWEENITEMS) + ((int)positions[i] / 3 * (_WIDTH + _PLACEBETWEENITEMS)),
                    (int)positions[i] % 3 * (_HEIGHT + _PLACEBETWEENITEMS) + _HOURSPOS_Y,
                    _WIDTH,
                    _HEIGHT
                    ));
            }

            //fields for the forth char ( 3*3 field )
            positions = randomizePositions(9, getPointsToDraw((int)Pos.MinuteLast));
            for (int i = 0; i < positions.Count; i++)
            {
                g.FillRectangle(Brushes.Blue,
                    new Rectangle(_HOURSPOS_X + 6 * (_WIDTH + _PLACEBETWEENITEMS) + ((int)positions[i] / 3 * (_WIDTH + _PLACEBETWEENITEMS)),
                    (int)positions[i] % 3 * (_HEIGHT + _PLACEBETWEENITEMS) + _HOURSPOS_Y,
                    _WIDTH,
                    _HEIGHT
                    ));
            }   
        }

        private void resetView()
        {
            foreach (PictureBox pictb in this.Controls.OfType<PictureBox>())
            {
                pictb.Image = imageDefault;
            }
        }

        private void updateView()
        {
            resetView();
            ArrayList positions = new ArrayList();
            //box1
            positions = randomizePositions(3,getPointsToDraw((int)Pos.HourFirst));
            for (int i = 0; i < positions.Count; i++)
            {
                hour1[(int)positions[i]].Image = imageSet;
            }
            //box2
            positions = randomizePositions(9, getPointsToDraw((int)Pos.HourLast));
            for (int i = 0; i < positions.Count; i++)
            {
                hour2[(int)positions[i]].Image = imageSet;
            }
            //box3
            positions = randomizePositions(6, getPointsToDraw((int)Pos.MinuteFirst));
            for (int i = 0; i < positions.Count; i++)
            {
                min1[(int)positions[i]].Image = imageSet;
            }
            //box4
            positions = randomizePositions(9, getPointsToDraw((int)Pos.MinuteLast));
            for (int i = 0; i < positions.Count; i++)
            {
                min2[(int)positions[i]].Image = imageSet;
            } 
        }

        Image imageSet;
        Image imageDefault;

        public TixWithImages()
        {
            InitializeComponent();
            imageSet = Resources.set;                            <<<<<<--------
            imageDefault = Resources._default;            <<<<<<--------
            initPictureBoxArrays();
            resetView();
            timer.Start();
        }

System.Windows.Controls.Image block1,block2,block3,block4;

        private void initArrays()
        {
            block1 = new System.Windows.Controls.Image[3];
            block1 = Image1x1;
            block1[1] = Image1x2;
            block1[2] = Image1x3;

            block2 = new System.Windows.Controls.Image[9];
            //uswusf
        }

//Einfacher Test für 11:11
            int num0 = RandomNumber(1, 4);
            int num1 = RandomNumber(1, 10);
            int num2 = RandomNumber(1, 6);
            int num3 = RandomNumber(1, 10);

            // dieser Aufruf ruft das Bild mit Index num0 auf und setzt die Sichtbarkeit
            // Ist num0 = 1 wird das Bild mit Index 1 gesetzt etc ( Allerdings musst du dann deine Zufallszahlen
            // bei 0 beginnen lassen.
            block1[num0].Visibility = Visibility.Visible;

            // dieser Aufruf ersetzt alles folgende:
            if (num0 == 1)
                Image1x1.Visibility = Visibility.Visible;
            if (num0 == 2)
                Image1x2.Visibility = Visibility.Visible;
            if (num0 == 3)
                Image1x3.Visibility = Visibility.Visible;

            //entsprechend fortfahren, dann kannst du die methoden von mir nutzen und nach und nach einbauen
            //die randomizePosition oder wie sie hieß ist dann dafür da, wenn du mehrere Positionen per Zufall               bestimmen willst