c# - LINQ extension methods: use Lambda expressions or methods? -

when using linq extension methods enumerable.select, better use lambda expression, or regular method?

i'm asking both respect (memory) optimization*, , readability**.

example code:

private void main() {     var array = new int[1];     var result1 = array.select(x => x.tostring());  // lambda     var result2 = array.select(linqhelper);  // method }  private string linqhelper(int x) {     return x.tostring(); } 

^{*i'm thinking of closures creating scopes unused instantiated variables in them, because variables in scope when lambda created. edit - stupid thinking, since variables captured closure when they're referenced in lambda expression.
**both options ok me.}

from optimization point of view, there should no difference.

from readability point of view, i'd think whether need same logic in several places. if so, use method , use method group conversion. way don't repeat yourself, don't have change several bits of code if requirements change.

if you're using logic in single place , it's short, lambda expression captures logic "inline" in way easier read imo.

i typically avoid long lambda expressions, possible exception of use tpl, e.g.

parallel.foreach(..., x => {    // i'm quite happy have long-ish lambda here - it's foreach    // loop body, basically. });