Why Does Random.Next Produce Repetitive Values in a Loop?

Understanding Random Number Generation Issues in Loops

Problem:

A common issue arises when using Random.Next within loops to generate random numbers. If you create a new Random object inside the loop for each iteration, you'll often observe repeated or predictable "random" numbers. This is especially true in fast-running loops.

Explanation:

The root cause lies in the Random object's initialization. Each Random instance is seeded using the system clock. If multiple instances are created within a very short time frame (as often happens in loops), they receive the same seed value. This leads to each Random object producing the identical sequence of pseudo-random numbers.

Resolution:

The solution is straightforward: create a single Random object outside the loop and reuse it for all random number generations within the loop. This ensures that a consistent, yet unpredictable, sequence of random numbers is generated. Pass this single Random instance as needed to any methods requiring random numbers.

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