LINQ - Picking the most recently created file
in [CSharp]
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From: "Bobby C. Jones" bjones beazer on 16 Mar 2010 11:50 "AA2e72E" <AA2e72E(a)discussions.microsoft.com> wrote in message news:71A689C6-1107-4D93-A3B1-1782D4898F9E(a)microsoft.com... > Thanks. However, I don't think I asked the right question. I'll try > again: > > Given: > > System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(@"c:\test"); > IEnumerable<System.IO.FileInfo> fileList = > dir.GetFiles("*.txt",System.IO.SearchOption.AllDirectories); > > fileList will contain files in the directory tree c:\test and files by the > same name will exist in c:\test\one\myfile.txt and c:\test\two\myfile.txt > etc. > > I would like to be able to pick the myfile.txt that has the latest > creation > time; obviously when a file exixts uniquely i.e. in one sub directory in > the > tree, it will have the latest creation time (by default) and will get > picked. > > I hope I have explained this adequately: thanks for your help. > Perhaps something like this DirectoryInfo dir = new DirectoryInfo(@"C:\test"); var newestFiles = from file in dir.GetFiles("*.txt", SearchOption.AllDirectories) orderby file.LastWriteTime descending group file by file.Name.ToUpper() into files select files.ElementAt(0); -- Bobby C. Jones http://bobbycjones.spaces.live.com
From: AA2e72E on 16 Mar 2010 12:26 A 'quick' test seems to indicate that this will work; I'll do some more testing. Thanks.
From: Peter Duniho on 16 Mar 2010 12:52
AA2e72E wrote: > Thanks. I am after > > 'That is, is the operation something like "look for any file named X, return > the one file named X that is the most recent"?' > > I am inclined to agree that there may not be a LINQ only solution although I > thought Linq87 (Max - Grouped) in the 101 Linq samples may provide a suitable > basis for a solution. As I wrote before, if that's what you are trying to do, the solution is simple. Just pass the filename as the search pattern for GetFiles(), and then use the LINQ example I posted first. Pete |