GetHashCode
C#
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What is GetHashCode method for? More importantly what is HashCode and why would we need it ? Thanks in advance.
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What is GetHashCode method for? More importantly what is HashCode and why would we need it ? Thanks in advance.
From MSDN[^]: A hash function is used to quickly generate a number (hash code) that corresponds to the value of an object. Hash functions are usually specific to each Type and must use at least one of the instance fields as input. A hash function must have the following properties:
- If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do not compare as equal, the GetHashCode methods for the two object do not have to return different values.
- The GetHashCode method for an object must consistently return the same hash code as long as there is no modification to the object state that determines the return value of the object's Equals method. Note that this is true only for the current execution of an application, and that a different hash code can be returned if the application is run again.
For the best performance, a hash function must generate a random distribution for all input. /ravi
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