[Solved] In C#, what does a call to Sort with two parameters in brackets mean?

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In C#, what does a call to Sort with two parameters in brackets mean?

You have this line of code:

nodes.Sort((x, y) => distances[x] - distances[y]);

You are not passing two parameters to the sort method but you are passing one parameter which is a delegate that takes 2 parameters. You are essentially doing the following but using a lambda notation:

var nodes = new List<int>();
nodes.Sort(SortIt);

And here is the SortIt method:

private int SortIt(int x, int y)
{
    return distances[x] - distances[y];
}

Keep in mind if you did it using the above approach, distances will have to be a class level field so the SortIt method can access it. With lambda expressions, this is what you have, it will just capture the distances variable and this is called a closure. Read this article if you want to know what closures are.

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solved In C#, what does a call to Sort with two parameters in brackets mean?