populate string array

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Hi,
In the code below the string array fileNames is populated with files from a directory.
The directory has files for each day. i.e. FileAxxx.csv where xxx refers to YYYYmmdd
Question:
How can this string array be populated only with files for today's date?
Thanks

String[] fileNames;

//populate fileNames string array...

ArrayList fileNamesArray = new ArrayList(fileNames);

Posted 15-Feb-12 21:46pm

arkiboys

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Herman<T>.Instance 16-Feb-12 3:52am

When using DirectoryInfo object you can add searchpattern

krumia 16-Feb-12 3:58am

Or the naive way, you can create the ArrayList object empty, loop through the first array, and match the filename. And if there's a match add the string to the ArrayList.

3 solutions

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OriginalGriff · Answer 1 · 2012-02-15T21:59:00

Try:

C#

var query = from file in fileNames
            where (new FileInfo(file)).LastWriteTime.Date == DateTime.Now.Date
            select file;
fileNames = query.ToArray<string>();

"Hi, Thanks for the reply But I forgot to say that I do not want to use LINQ for project reasons."

Then try:

C#

List<string> todayFiles = new List<string>();
foreach (string file in files)
    {
    if ((new FileInfo(file)).LastWriteTime.Date == DateTime.Now.Date)
        {
        todayFiles.Add(file);
        }
    }
files = todayFiles.ToArray<string>();

ProEnggSoft · Answer 2 · 2012-02-15T22:12:00

Solution 2

You may try the following code

C#

string[] fileNames = {"abcdef20120216.csv","ijklmn20120215.csv","pqrst20120216.csv"};
DateTime today = DateTime.Now;
string searchDate = 
	string.Format("{0:0000}{1:00}{2:00}.csv",today.Year,today.Month,today.Day);
ArrayList fileNamesArray = new ArrayList();
foreach(string fileName in fileNames){
	if (fileName.EndsWith(searchDate))
		fileNamesArray.Add(fileName);
}

If your problem is solved then you may accept and vote the solution, otherwise please post your queries

PES

Posted 15-Feb-12 22:12pm

ProEnggSoft

Comments

arkiboys 16-Feb-12 4:28am

This seems to be good.
How can I now populate the fileNamesArray with only files with particular names such as FileA, FileW, FileK, etc?
Thanks

ProEnggSoft 16-Feb-12 5:01am

If your search string follows a pattern, then you can replace the search criterion in the above code as below
if(Regex.IsMatch(fileName,@".*file[AWK].*"+searchDate + "$",RegexOptions.IgnoreCase))
Hope, this will meet your requirement

PES

arkiboys 16-Feb-12 5:21am

Thanks

ProEnggSoft 16-Feb-12 5:44am

Thanks:)
If your problem is solved, you can mark the solution as accepted, so that other users can know that the question is answered, and they can view it if required.

PES

CRDave1988 · Answer 3 · 2012-02-15T22:16:00

Solution 3

Try Something like this:

C#

string[] name = Directory.GetFiles("<path>", "*" + DateTime.Now.ToString("yyyyMMdd") + ".csv");</path>

Posted 15-Feb-12 22:16pm

CRDave1988