Very basic question about linq select method

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Hi,
This is declaration of Select method:
Select<tsource,tresult>(IEnumerable<tsource>, Func<tsource,int32,tresult>)

So why we use it as so:
list.Select(s=>s.Name)

s=>s.Name is an anonymous method so it is a Func delegate then where is the first parameter which is IEnumerable<tsource>

I would expect it
list.Select(list,s=>s.Name)

What I have tried:

I searched on linq materials, and searched on google.

Posted 16-Aug-19 2:32am

leone

Updated 16-Aug-19 2:38am

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F-ES Sitecore · Accepted Answer · 2019-08-16T02:39:00

Select is an extension method with the first param (IEnumerable<tsource> source) marked as "this";

IEnumerable<TResult> Select<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector)

The way extension methods word is the object you enact them on is passed to the "this" param so you're right in that the method is actually called;

list.Select(list,s=>s.Name)

however .net passes the "list" object as the first param as that param is marked "this"

so this code here;

list.Select(s=>s.Name)

is compiled as

list.Select(list,s=>s.Name)

with the compiler passing the first param for you.