Why Does My Random Number Generator Produce Identical Values, and How Can I Fix It?

Troubleshooting and Fixing Repeated Random Numbers

The RandomNumber function, intended to generate random integers within a given range, produces identical values when multiple Random instances are created in a loop. This occurs because each Random instance initializes using the current time. In rapid loops, the time remains virtually unchanged, leading to repeated random number generation.

The solution is to use a single, shared Random instance for all number generation. This prevents multiple threads from simultaneously modifying the internal state of the generator. Thread safety is crucial here.

Here's the improved code:

<code class="language-csharp">private static readonly Random random = new Random(); // Single instance

public static int RandomNumber(int min, int max)
{
    lock (random) // Thread-safe access
    {
        return random.Next(min, max);
    }
}</code>

By using a lock statement to synchronize access to the single random instance, we ensure each thread gets a unique random number. This method is both efficient and thread-safe, guaranteeing the desired randomness.

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