Question

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Random number generator not working the way I had planned (C#)

I have LinkedList of LinkedList, and when I try to dispaly after filling, the raws are the same, but the most curious is that in debug mode it dispalays different rows.
BTW I have VS11 beta.

    private LinkedList<LinkedList<int>> grid = new LinkedList<LinkedList<int>>();


    public void CreateMatrix(int rows, int coloumns, int maxSize)
    {
        for(int i = 0; i < rows;i++)
        {
            grid.AddFirst(generateList(coloumns, maxSize));
        }
    }



    private LinkedList<int> generateList(int size, int maxSize)
    {
        var ranodGenerator = new Random();
        var list = new LinkedList<int>();
        for (int j = 0; j < size; j++)
        {
            list.AddFirst(ranodGenerator.Next(maxSize));
        }
        return list;
    }


    public void DisplayMatrix()
    {
        foreach (var list in grid)
        {
            foreach (var i in list)
            {
                Console.Write(i+ " ");
            }
            Console.WriteLine();
        }
    }

So after

MatrixManager matrixManager = new MatrixManager();
            matrixManager.CreateMatrix(4,4,200);
            matrixManager.DisplayMatrix();

it will display 4 identical rows

134 3 45 26
134 3 45 26
134 3 45 26
134 3 45 26

but should display different

Answer 1

This should be duplicate of “How to use Random”

var ranodGenerator = new Random();

This line restarts creation of random numbers. Create one random number generator and life will be much better.

Here is the FAQ: Random number generator only generating one random number