Here is something neat I found out.
Say you are writing an application and one of the requirements is to allow File System search. You could always start using loops and such. I thought to myself why not do it in LINQ? I played around with it and in fact it is not so hard.
Lets see how it is done. Here is method that allows finding a specific file name in side a directory.
1: private List SearchFilesByName(string DirectoryPath, string FileName)
2: {
3: return (from file in new DirectoryInfo(DirectoryPath).GetFiles()
4: where file.Name == FileName select file).ToList();
5: }
Basically we Query the FileInfo[] which is returned from the GetFiles() method and compare the file name.
Here is another example for using a Query for the file extension, it is very much the same except for the condition:
1: private List SearchFilesByName(string DirectoryPath, string Extention)
2: {
3: return (from file in new DirectoryInfo(DirectoryPath).GetFiles()
4: where file.Extension == Extention
5: select file).ToList();
6: }
Of course this is only usable for one directory but you can easily expand it and make it recursive. I bet you are as lazy as I am so here is something 
1: private List SearchFilesByExtention(DirectoryInfo Directoryinf, string Extention)
2: {
3: List res = new List();
4: DirectoryInfo[] Dirs = Directoryinf.GetDirectories();
5:
6: //Check the files that are in the current derectory
7: res = (from file in Directoryinf.GetFiles()
8: where file.Extension == Extention
9: select file).ToList();
10:
11: //Recursevly go over all the other directories
12: foreach (DirectoryInfo d in Dirs)
13: {
14: res.AddRange(SearchFilesByExtention(d, Extention));
15: }
16: return res;
17: }
Nice isn’t it? If I have a bug Please Comment.
Amit.
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