LinQ: Max() vs OrderBy()-FirstOrDefault()

What about this:

var i = (from item in listOfItems
select item).Max();

And what about if listOfItems is empty ?
Max() throws an exceptions, then you change to:

var i = (from item in listOfItems
order by item descending
select item).FirstOrDefault();

but, the last statement has higher cpu usage.

Jon Skeet in A short case study in LINQ efficiency made a performance test very interesting.

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2 Responses to “LinQ: Max() vs OrderBy()-FirstOrDefault()”

  1. ivowiblo Says:

    Maybe you could add a new extension method:

    public static T MaxOrDefault( this IEnumerable self){
    if( self.Count() == 0 )
    return default(TReturn);

    return self.Max();
    }

    I know, it uses Count() and you don’t know what it will be doing there but for sure you can change the implementation in the future if you need it.

  2. Exploring LinQ « a developer’s breadcrumb Says:

    […] to my last post (LinQ: Max() vs OrderBy()-FirstOrDefault()) here is a similar example: var i = (from item in listOfItems where item.Size = listOfItems.Max(i […]

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