Question

I’m developing a small XNA GAME,

 for (int birdCount = 0; birdCount < 20; birdCount++)
            {
                Bird bird = new Bird();
                bird.AddSpriteSheet(bird.CurrentState, birdSheet);
                BIRDS.Add(bird);
            }

The code above runs at Load function, BIRDS is the List where all Bird’s are held.

The bird constructor customize the bird randomly. If I run the code breakPoint by breakPoint the random function generates different values, but if i do not stop the code and leave program running all random values become same so that all of birds become same.

How can i solve this problem ?

the code for random and seeds:

 private void randomize()
    {
        Random seedRandom = new Random();
        Random random = new Random(seedRandom.Next(100));
        Random random2 = new Random(seedRandom.Next(150));

        this.CurrentFrame = random.Next(0, this.textures[CurrentState].TotalFrameNumber - 1);

        float scaleFactor = (float)random2.Next(50, 150) / 100;
        this.Scale = new Vector2(scaleFactor, scaleFactor);

        // more codes ...

        this.Speed = new Vector2(2f * Scale.X, 0);
        this.Acceleration = Vector2.Zero;
    }

Answer 1

Chances are you are repeatedly creating a new Random object in your code – instead create the Random object once only (i.e. by making it static or passing it as a parameter)

Since the Random default constructor uses the current time as initial seed and all instances of Random with the same seed create the same sequence of numbers creating new Random objects in fast order might produce the same exact sequence of numbers. This sounds like what you are seeing.