How can I return a proper hash code?

Question

Hello, I'm trying to return a unique hash code in the GetHashCode() method by multiplying the HashCode of the current object by 31 and then adding it to the new object HashCode.

Can you help me get this rigth?

Thanks a lot :)

VocabularyWord.cs

using System;

namespace Treehouse.CodeChallenges
{
    public class VocabularyWord
    {
        public string Word { get; private set; }

        public VocabularyWord(string word)
        {
            Word = word;
        }

        public override string ToString()
        {
            return Word;
        }

        public override bool Equals(object obj)
        {
            if(!(obj is VocabularyWord))
            {
                return false;
            }

            var that = obj as VocabularyWord;

            return this.Word.Equals(that.Word);
        }

        public override int GetHashCode(object obj)
        {
            return this.GetHashCode() * 31 + obj.GetHashCode();
        }
    }
}

Answer 1 · 2018-05-12T00:12:33Z

May 12, 2018 12:12am

I see two issues at first glance:

the "GetHashCode" method should not take any parameters
calling a method from inside itself ("this.GetHashCode()") will create a recursion loop

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Tiago Ramos

Tiago Ramos

How can I return a proper hash code?

1 Answer

Steven Parker

Steven Parker