C#:Getting all image files in folder

Question

I am trying to get all images from folder but ,this folder also include sub folders. like /photos/person1/ and /photos/person2/ .I can get photos in folder like

  path= System.IO.Directory.GetCurrentDirectory() + "/photo/" + groupNO + "/";
 public List<String> GetImagesPath(String folderName)
    {

        DirectoryInfo Folder;
        FileInfo[] Images;

        Folder = new DirectoryInfo(folderName);
        Images = Folder.GetFiles();
        List<String> imagesList = new List<String>();

        for (int i = 0; i < Images.Length; i++)
        {
            imagesList.Add(String.Format(@"{0}/{1}", folderName, Images[i].Name));
           // Console.WriteLine(String.Format(@"{0}/{1}", folderName, Images[i].Name));
        }


        return imagesList;
    }

But how can I get all photos in all sub folders? I mean I want to get all photos in /photo/ directory at once.

Solution 1

Have a look at the DirectoryInfo.GetFiles overload that takes a SearchOption argument and pass SearchOption.AllDirectories to get the files including all sub-directories.

Another option is to use Directory.GetFiles which has an overload that takes a SearchOption argument as well:

return Directory.GetFiles(folderName, "*.*", SearchOption.AllDirectories)
                .ToList();

Solution 2

I'm using GetFiles wrapped in method like below:

 public static String[] GetFilesFrom(String searchFolder, String[] filters, bool isRecursive)
 {
    List<String> filesFound = new List<String>();
    var searchOption = isRecursive ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
    foreach (var filter in filters)
    {
       filesFound.AddRange(Directory.GetFiles(searchFolder, String.Format("*.{0}", filter), searchOption));
    }
    return filesFound.ToArray();
 }

It's easy to use:

String searchFolder = @"C:\MyFolderWithImages";
var filters = new String[] { "jpg", "jpeg", "png", "gif", "tiff", "bmp", "svg" };
var files = GetFilesFrom(searchFolder, filters, false);

Solution 3

There's a good one-liner solution for this on a similar thread:

get all files recursively then filter file extensions with LINQ

Or if LINQ cannot be used, then use a RegEx to filter file extensions:

var files = Directory.GetFiles("C:\\path", "*.*", SearchOption.AllDirectories);

List<string> imageFiles = new List<string>();
foreach (string filename in files)
{
    if (Regex.IsMatch(filename, @"\.jpg$|\.png$|\.gif$"))
        imageFiles.Add(filename);
}

Solution 4

I found the solution this Might work

                foreach (string img in Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.Desktop),"*.bmp" + "*.jpg" + "SO ON"))

Solution 5

This allows you to use use the same syntax and functionality as Directory.GetFiles(path, pattern, options); except with an array of patterns instead of just one.

So you can also use it to do tasks like find all files that contain the word "taxes" that you may have used to keep records over the past year (xlsx, xls, odf, csv, tsv, doc, docx, pdf, txt...).

public static class CustomDirectoryTools {
    public static string[] GetFiles(string path, string[] patterns = null, SearchOption options = SearchOption.TopDirectoryOnly) {
        if(patterns == null || patterns.Length == 0)
            return Directory.GetFiles(path, "*", options);
        if(patterns.Length == 1)
            return Directory.GetFiles(path, patterns[0], options);
        return patterns.SelectMany(pattern => Directory.GetFiles(path, pattern, options)).Distinct().ToArray();
    }
}

In order to get all image files on your c drive you would implement it like this.

string path = @"C:\";
string[] patterns = new[] {"*.jpg", "*.jpeg", "*.jpe", "*.jif", "*.jfif", "*.jfi", "*.webp", "*.gif", "*.png", "*.apng", "*.bmp", "*.dib", "*.tiff", "*.tif", "*.svg", "*.svgz", "*.ico", "*.xbm"};
string[] images = CustomDirectoryTools.GetFiles(path, patterns, SearchOption.AllDirectories);

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Comments

[Faisal Mansoor]

I usually prefer enumerating each directory manually rather than using SearchOption.AllDirectories, because with SearchOption.AllDirectories the complete call will fail if a UnauthorizedAccessException occur while enumerating a subfolder. github.com/faisalmansoor/MiscUtil/blob/master/EnumFiles/…