简单的LINQ重构/样式

Question

As LINQ Select() wants a FUNC<int,T> as argument, I have to define an unused variable. I think query syntax makes that clearer in this case.

How do I get rid of any clutter to make that simple and clean to read?

var rand = new Random();

//Method syntax

IEnumerable<char> c = Enumerable.Range(0, 10)                          
                                .Select( (p) => (char)('A' + rand.Next(0,26)));
//Query syntax
var c = from counter in Enumerable.Range(0,10)
            select (char)('A' + rand.Next(0,26));

Answer 1

It looks pretty clean and easy to read already.

I don't think you'll get any further, nor that it's worthwhile -- even if you define your own Select<T, TR>(this T t, Func<TR> f) , you'll still have to call it as t.Select(() => ...) (notice the empty parentheses).

You can explicitly mark an unused variable as _ though:

var c = Enumerable.Range(0, 10).Select(_ => (char)('A' + rand.Next(0, 26)));

Or, you can use an added abstraction and hide the projection, say, in a local method:)

char RandomChar(int _) => (char)('A' + rnd.Next(0, 26));

var c = Enumerable.Range(0, 10).Select(RandomChar);