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C# C# Objects Encapsulation with Properties Expression Bodied Members

Posted by Trailhead Boise5
Trailhead Boise5
4,979 Points

"Did you convert the property to a single-lined, expression bodied property?" error.

I'm not sure how to solve challenge task one for the code challenge. I keep getting the above error when I submit this code.

namespace Treehouse.CodeChallenges { class Square : Polygon { public double SideLength { get; private set; }

    public double Area { get; set; }

    public Square(double sideLength) : base(4)
    {
        SideLength = sideLength;
    }

    public void Scale(double factor)
    {
        SideLength *= factor;
    }
}

}

I'm not sure why this is wrong. Help?

1 Answer

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

:point_right: You should not change the value returned by the computed property.

You just need to change the form of the definition.

To see an example of this kind of refactoring, skip to about 01:30 in the video Expression Bodied Members.

John Paige
John Paige
7,436 Points
John Paige
John Paige
7,436 Points

Hey Steven Parker. I am curious about why the passing code needs to use the "=>" sign as opposed to the "=". Initially i just used the "=" sign and it didn't pass. Then I edited the sign, and it passed. It seemed like the "=" would be correct in this context, considering that the area of any square can't possibly be greater than the square of one of its sides.

namespace Treehouse.CodeChallenges
{
    class Square : Polygon
    {
        public double SideLength { get; private set; }

        public double Area => SideLength * SideLength; //<---When the sign is "=", it does not pass.


        public Square(double sideLength) : base(4)
        {
            SideLength = sideLength;
        }

        public void Scale(double factor) => SideLength *= factor;



    }
}