How do I use a Lambda expression to sort INTEGERS inside a object?

问题

I have a collection of objects and I know that I can sort by NAME (string type) by saying

collEquipment.Sort((x, y) => string.Compare(x.ItemName, y.ItemName));

that WORKS.

But I want to sort by a ID (integer type) and there is no such thing as Int32.Compare

So how do I do this? This doesn't work

collEquipment.Sort((x, y) => (x.ID < y.ID));  //error

I know the answer is going to be really simple. Lambda expressions confuse me.

回答1:

try this

collEquipment.Sort((x, y) => y.ID - x.ID);

回答2:

collEquipment.Sort((x, y) => y.ID.CompareTo(x.ID));

回答3:

Here you go, sort a list against any property that implements IComparable[<T>] (which int does):

public static class ListExtensions {
    public static void Sort<TSource, TValue>(
        this List<TSource> list,
        Func<TSource, TValue> selector) {
        list.Sort((x,y) => Comparer<TValue>.Default
            .Compare(selector(x),selector(y)));
    }
}

Now:

collEquipment.Sort(x => x.ItemName);

or

collEquipment.Sort(x => x.ID);

来源：https://stackoverflow.com/questions/2766686/how-do-i-use-a-lambda-expression-to-sort-integers-inside-a-object