How Can I Ensure Unique Random Numbers in C#?

Seeding a Random Class for Unique Values

In your code, you have a static instance of the Random class, which generates a sequence of random numbers. However, you're encountering an issue where the same randomNumber is repeatedly obtained within a loop. This is because the Random class is initialized with a fixed seed by default, leading to predictable values.

To resolve this problem, you need to seed the Random class with a random or unique value. One effective approach is to use the GetHashCode() method of the Guid class:

Random rand = new Random(Guid.NewGuid().GetHashCode());

The Guid class generates a globally unique identifier (GUID), which can serve as a seed for the Random class. The GetHashCode() method provides a hash code of the GUID, ensuring a different seed on each invocation.

Using this approach, the Random class will generate a sequence of truly random numbers, even within a loop, eliminating duplicate randomNumber values.

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