hash objects containing string properties in c#

Question

I need to make a custom class as key in my dictionary. Which method is used by C# to do hashing when key is string?

internal class Patient:IEquatable<Patient>
    {
        public string fname{ get; set; }
        public string lname{ get; set; }
      

    
        public override int GetHashCode()
        {
            return StringComparer.OrdinalIgnoreCase.GetHashCode(fname+lname);

        }

    }

Is this the correct approach (concatenation and generating hash), or is their any better way to generate hash.

Answer 1

Since .NET Core 2.1 you can use HashCode.Combine :

return HashCode.Combine(fname, lname);

Or for case insensitive version:

return HashCode.Combine(StringComparer.OrdinalIgnoreCase.GetHashCode(fname),
    StringComparer.OrdinalIgnoreCase.GetHashCode(fname));