How to use Array.sort to sort an array of structs,

问题:

Simple, I have a struct like this:

struct bla{
  string name;
  float depth;
}

I have an bla array, and I want to sort by depth, being the greatest depth first. What should the delegate do/return? I cant find any concrete example.

回答1:

You can use the overload of Array.Sort which takes a Comparison<T>:

bla[] blas = new[] { 
    new bla() { name = "3", depth = 3 }, 
    new bla() { name = "4", depth = 4 }, 
    new bla() { name = "2", depth = 2 }, 
    new bla() { name = "1", depth = 1 }, 
};

Array.Sort<bla>(blas, (x,y) => x.depth.CompareTo(y.depth));

On this way you sort the original array instead of creating new one.

回答2:

you find an example here: How would I sort through an array of structs?

you have two ways to do this, compact or expanded way:

struct bla
{
    public string name;
    public float depth;
}

bla[] theArray = new bla[5];

Array.Sort(theArray, (x, y) => x.depth.CompareTo(y.depth));

Array.Sort(theArray, delegate(bla bla1, bla bla2)
{
    return bla1.depth.CompareTo(bla2.depth);
});

swap x or y or bla1 and bla2 if the sort order is opposite of what you want.

回答3:

using System.Linq;

blas.OrderByDescending(x=>x.depth)

or

Array.Sort(blas, (x, y) => y.depth.CompareTo(x.depth) );