Code inspection: Use 'HashCode.Combine' to calculate the hash code

This inspection reports hash-code calculations that create a temporary value tuple and call GetHashCode() on it. When System.HashCode is available, HashCode.Combine(...) expresses the same intent directly and avoids using a temporary tuple. The inspection is reported for ValueTuple.GetHashCode() calls with up to 8 tuple components. For larger tuples, use a hash-code calculation that includes every component.

Example

                using System;
                public sealed class Customer(int id, string name)
                {
                    public override int GetHashCode()
                    {
                        return (id, name).GetHashCode();
                    }
                }
            

                using System;
                public sealed class Customer(int id, string name)
                {
                    public override int GetHashCode()
                    {
                        return HashCode.Combine(id, name);
                    }
                }
            

Quick-fix

Replace the ValueTuple.GetHashCode() call with HashCode.Combine(...). Tuple element names do not affect the hash code and are not included in the replacement.

13 July 2026