How Can I Effectively Randomize a Generic List in C# for Lottery Applications?

Build a fair lottery application: random sorting of C#generic list

The key to developing lottery applications is to ensure random sorting of list elements. This article discusses the best way to achieve the generic list

random sorting in C#.

<list></list> Fisher-Yates shuffle algorithm

Fisher-Yates shuffle algorithm is a method of efficient disruption of generic lists. The algorithm operates through the extension method Interface:

How to use: IList

private static Random rng = new Random();

public static void Shuffle<T>(this IList<T> list)
{
    int n = list.Count;
    while (n > 1)
    {
        n--;
        int k = rng.Next(n + 1);
        T value = list[k];
        list[k] = list[n];
        list[n] = value;
    }
}

Just call this method on any collection:

The consideration of the random number generator

IList Although the class is convenient, its randomness may be insufficient. In order to improve the randomness, it is recommended to use the random number generator in

:

List<Product> products = GetProducts();
products.Shuffle();

Thread security improvement

In order to avoid potential problems in multi -threaded environments, it can improve thread security: System.Random System.Security.Cryptography

This ensures that each thread uses its own random number generator to avoid conflict.

using System.Security.Cryptography;
...
public static void Shuffle<T>(this IList<T> list)
{
    RNGCryptoServiceProvider provider = new RNGCryptoServiceProvider();
    int n = list.Count;
    while (n > 1)
    {
        byte[] box = new byte[1];
        do provider.GetBytes(box);
        while (!(box[0] < 251)); // Ensure a valid range
        int k = (int)(box[0] / 251.0 * (n + 1)); // Scale to the list size
        T value = list[k];
        list[k] = list[n];
        list[n] = value;
    }
}

Through these methods, you can effectively sort the elements in the generic list of generics to create a truly random lottery lottery application.

The above is the detailed content of How Can I Effectively Randomize a Generic List in C# for Lottery Applications?. For more information, please follow other related articles on the PHP Chinese website!