[RESOLVED] get all files in folder that are newer than a certain time.

[Arc]

Hey guys, I am trying to open up a folder and find all files of a certain type that are newer than a certain date/time.

I have this code here which gets all the files of the specified type, but I am not sure how to get it to also read the date/time of the file and only add ones that are newer than a specified date/time. Talking about the Creation date/time or last modified date/time whichever.

DirectoryInfo di = new DirectoryInfo(folderpath);
FileInfo[] rgFiles = di.GetFiles("*.env");//where date/time newer than 7/07/2007 5:34 PM

Any idea for an ellegant way of doing this?

Thanks!

[Atheist]

Is this elegant enough?

DateTime dt = new DateTime(2007,07,7,5,34,0);
            DirectoryInfo di = new DirectoryInfo(folderpath);
            foreach(FileInfo fi in di.GetFiles("*env"))
            {
                if (fi.CreationTime > dt)
                {
 
                }
            }

[Arc]

That looks promising. Thanks a lot.

Now to go test it out

[Arc]

Ok, thanks again for the help. I am trying to make a method out of this code here, but apparently I don't know enough about handling arrays in C# to get it to work.

I am inputing a folderpath into the method then I want to return an array of file names. But I am getting an error that says, "Use of unassigned local variable 'theFiles'" which is the array I am trying to store the file names into.

There may be other things wrong with the code as well. Anyone care to give me a lesson on C# arrays?

Thanks!

private string[] getFiles(string folderPath)
        {
            string[] theFiles;
  
            DateTime dt = new DateTime(2006, 07, 7, 5, 34, 0); 
            DirectoryInfo di = new DirectoryInfo(folderPath);
            FileInfo[] fi = di.GetFiles("*.env");

            for (int i = 0; i < fi.Length; i++)
            {
                if (fi[i].CreationTime > dt)
                {
                    theFiles[i] = fi.GetValue(i).ToString();
                } 
            }//end for
           
            return theFiles;

        }//end getFiles

[Arc]

Hrmmm. Ok I figured out that arrays have to be intialized and how to do it, I think. By adding this line to the code posted above I no longer get an error

theFiles = new string[] { };

However, I must be doing someting wrong when calling the method because it is not giving any results.

Here is the method

private string[] getFiles(string folderPath)
        {
            string[] theFiles;
            theFiles = new string[] { };
  
            DateTime dt = new DateTime(2006, 07, 7, 5, 34, 0); 
            DirectoryInfo di = new DirectoryInfo(folderPath);
            FileInfo[] fi = di.GetFiles("*.env");

            for (int i = 0; i < fi.Length-1; i++)
            {
                if (fi[i].CreationTime > dt)
                {
                    theFiles[i] = fi.GetValue(i).ToString();
                } 
            }//end for
           
            return theFiles;

        }//end getFiles

And here is how I am calling it

string[] fileArray;
                fileArray = new string[] { };
                fileArray = getFiles(pathwaysPath);

                for (int i = 0; i < fileArray.Length; i++)
                {
                    MessageBox.Show(fileArray[i]);

                }//end for

Any Idears?

Thanks!

[jmcilhinney]

public string[] GetFilesAfterDate(string folder, DateTime date)
{
    FileInfo[] files = new DirectoryInfo(folder).GetFiles();
    List<FileInfo> fileList = new List<FileInfo>();

    fileList.AddRange(files);

    if (files.Length > 0)
    {
        for (int index = 0; index < files.GetUpperBound(0); index++)
        {
            if (files[index].LastWriteTime > date)
            {
                fileList.Add(files[index]);
            }
        }
    }

    string[] filePaths = new string[fileList.Count];

    for (int index = 0; index < filePaths.GetUpperBound(0); index++)
    {
        filePaths[index] = fileList[index].FullName;
    }

    return filePaths;
}

[Arc]

Thanks for that code jmc. I am getting a return result and I am able to loop thru the results. However, it doesn't seem to be taking the date into account. It is returning every file regardless of date.

I tried changing the line if (files[index].LastWriteTime >date) to CreationTime, CreationTimeUtc, LastWriteTimeUtc etc.... But I get the same result.

The Date I am passing looks like 7/7/2007 2:34:35 PM for example. It is a string I am pulling out of the registry that I am converting to DateTime.

Here is the code I am using to call the method and then show the results..for testing purposes.

               string[] theFiles;
                theFiles = new string[] { };
                DateTime scan = Convert.ToDateTime(lastScan);
                theFiles = GetFilesAfterDate(pathwaysPath,scan);
                for (int i = 0; i < theFiles.Length; i++)
                {
                MessageBox.Show(theFiles[i]);

                }//end for

[Arc]

Never mind, I figured out the issue.

I just had to remove this line fileList.AddRange(files);

Thanks again!

[jmcilhinney]

Oops! Sorry about that. I changed the implementation and forgot to remove that line from the way I was doing it previously.