What are the best practices for implementing GetHashCode in C#?

What are the best practices for implementing GetHashCode in C#?

When implementing GetHashCode in C#, ensure that it is consistent with Equals, use prime numbers, and consider the object's state.

Can you explain why it's important for GetHashCode to be consistent with Equals?

Yes, if two objects are considered equal by the Equals method, they must return the same hash code. This is crucial for collections like hash tables.

What are some common mistakes to avoid when implementing GetHashCode?

Common mistakes include using mutable fields, not considering all relevant fields, and returning constant values.

How can I test my GetHashCode implementation?

You can test it by creating a set of objects, checking their hash codes, and ensuring that equal objects return the same hash code.