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C# Intermediate C# System.Object Object.Equals

Posted by Martin Zarate
Martin Zarate
10,723 Points

Stuck trying to override the Equals(object obj) method. Here is my code:

I'd been trying for a while now and I am just spinning my wheels at this point, any help is greatly appreciated, here is the code:

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;
        }

        // this is my code - the one that does not work :( 
        public override bool Equals(object obj)
        {
            if ( !(obj is Word) )
            {
                return false;
            }

            Word that = obj as Word;

            return this == that;
        }
    }
}
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 Word) )
            {
                return false;
            }

            Word that = obj as Word;

            return this == that;
        }
    }
}

1 Answer

andren
andren
28,558 Points
andren
andren
28,558 Points

You seem to have slightly misunderstood the challenge.

The name of the class is VocabularyWord not Word. Word is a property that exists on the VocabularyWord class.

So the equal method is meant to check if the obj is a VocabularyWord instance and then cast it as such if that is the case. Then return true or false based on whether the Word properties of the two objects match up.

Since most of your code is fine besides the naming confusion all you need to do to fix your code is to change all references of Word to VocabularyWord, and then to add .Word to your comparison. Like this:

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;
            }

            VocabularyWord that = obj as VocabularyWord;

            return this.Word == that.Word;
        }
    }
}
Martin Zarate
Martin Zarate
10,723 Points

Awesome, thank you. I had it with the VocabularyWord class originally, but I changed it trying to fix the issue. All I was missing was the .Word property call on the return statement. Thank you for the quick response.