FileSystem in C#

Here is a way to retrieve file info in C#
using LINQ syntax.
Feel free to comment.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace FileSystem
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            DirectoryInfo root = new DirectoryInfo(".");
            var files = from FileInfo f in root.GetFiles()
                        select new { FileName = f.Name, LengthFile = f.Length };


            dataGridView1.DataSource = files.ToList();
            
        }
    }
}

LINQ - Operators

Here is the main list of LINQ operators
Thanks >Kader Yildirim

Restriction operators
  Where

Projection operators
  Select
  SelectMany

Partitioning operators
  Take
  Skip
  TakeWhile
  SkipWhile

Ordering operators
  OrderBy
  OrderByDescending
  ThenBy
  ThenByDescending
  Reverse

Grouping operators
  GroupBy
  Joining operators
  Join
  GroupJoin

Set operators
  Distinct
  Union
  Intersect
  Except

Conversion operators
  Cast
  ToArray
  ToList
  ToDictionary
  OfType
  ToLookup
  ToSequence

Element operators
  DefaultEmpty
  First
  FirstOrDefault
  Last
  LastOrDefault
  ElementAt
  ElementAtOrDefault
  Single
  SingleOrDefault

Generation operators
  Empty
  Range
  Repeat
  Quantifiers
  Any
  All
  Contains

Aggregate operators
  Aggregate
  Count
  LongCount
  Sum
  Min
  Max
  Average
  Fold

Miscellaneous operators
  Concat
  EqualAll
  Custom Sequence operators
  Combine
  Query Execution
  Deferred
  Immediate
  QueryReuse

LINQ - Articles in french

Some french articles using LINQ

LINQ à 360 degré

Functional programming - C#

Here is a series of articles concerning functional in C#

A C# library to write functional code

Extension Method - C#

Extensions Methods are the base of LINQ implementation.
Mitsuru Furuta from Microsoft France show a neat way
to return default value from a dictionnary

http://blogs.msdn.com/mitsufu/archive/2008/05/07/astuce-faciliter-la-lecture-des-donn-es-d-un-dictionnaire-gr-ce-une-m-thode-d-extension.aspx
Thanks Mitsuru for this nice tip

Functional Programming in C#

Functional programming style can save a lot of time.
Here are somme samples from Microsoft site itself.
C# tend to include some F# features.
Give it a look, it will change your life as a C# developper ;-)

The following topics are covered

Closures
Currying
Filter
Fold
Iterators
Lazy Evaluation
LINQ
Lists (Immutable and Recursive)
List Continuations
Maps/Map2
Memoization
Monads
Operators (Forward, Reverse, etc)
Recursion
Unfolding and Generators

http://code.msdn.microsoft.com/FunctionalCSharp

IEnumerable and IEnumerator

Here is a a nice article on how to implement
those interfaces with your own objects.

http://codebetter.com/blogs/david.hayden/archive/2005/03/08/59419.aspx