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Start your free trialScott Tucker
3,765 PointsJoins Challenge help
When I used query syntax to solve this challenge I passed, but I want to be able to use and understand how to do this with method syntax. I have watched the video prior to this over and over again and I just can't seem to get it right. I believe that my resultSelector is wrong but I don't know exactly how to fix it.
var myBirds = new List<Bird>
{
new Bird { Name = "Cardinal", Color = "Red", Sightings = 3 },
new Bird { Name = "Dove", Color = "White", Sightings = 2 },
new Bird { Name = "Robin", Color = "Red", Sightings = 5 }
};
var yourBirds = new List<Bird>
{
new Bird { Name = "Dove", Color = "White", Sightings = 2 },
new Bird { Name = "Robin", Color = "Red", Sightings = 5 },
new Bird { Name = "Canary", Color = "Yellow", Sightings = 0 }
};
var ourBirds = myBirds.Join(yourBirds,
m => m.Name,
y => y.Name,
bird => myBirds);
1 Answer
Steven Parker
231,198 PointsYou're close. But the final argument to .Join (the resultSelector) should be a Func<TOuter,βTInner,βTResult>
This means it takes two arguments and returns a result (which in this case can be either of the arguments).
So if we modify that call like this, your method syntax version should also pass the challenge:
var ourBirds = myBirds.Join(yourBirds,
m => m.Name,
y => y.Name,
(m, y) => m);
Happy coding! Β -sp
Scott Tucker
3,765 PointsScott Tucker
3,765 PointsThis worked. Thank you so much!