sort images by LastTimeWrite

Question

I'm creating simple image viewer, but I want to make a sorting of pictures by LastTimeWrite. I have an OpenFileDialog to load pics, when I choose the pic in the folder then ProcessDirectory() is called.

private void ProcessDirectory()
        {
            FileTypes = new ArrayList();
            FileTypes.Add("*.JPG");
            FileTypes.Add("*.JPEG");
            FileTypes.Add("*.GIF");
            FileTypes.Add("*.BMP");
            FileTypes.Add("*.PNG");
            FileTypes.Add("*.TIF");
            FileTypes.Add("*.TIFF");

            string[] szFiles;
            FileArray = new ArrayList();

            foreach (string szType in FileTypes)
            {
                szFiles = Directory.GetFiles(Directory.GetCurrentDirectory(), szType);
                if (szFiles.Length > 0)
                    FileArray.AddRange(szFiles);
                //switch (SortImg)
                //{
                //    case ("Asc"):
                //        FileArray.Sort();
                //        break;
                //    case("Date"):
                string[] MyString = new string[szFiles.Length];      
                        DateTime[] creationTimes = new DateTime[szFiles.Length];
                        for (int i = 0; i < szFiles.Length; i++)
                        {
                            creationTimes[i] = new FileInfo(szFiles[i]).LastWriteTime;
                            //creationTimes[i].ToString("yyyy-MM-dd HH:mm tt");
                        }

                        for (int i = 0; i < szFiles.Length; i++)
                            MyString[i] = Convert.ToString(creationTimes[i].ToString("yyyy-MM-dd HH:mm tt"));

                FileArray.Sort();
                        listBox1.Items.AddRange(MyString);
                        FileArray.AddRange(MyString);
...
                 }

Answer 1

I would use a slightly different approach (this requires C# 3):

List<FileInfo> files = new List<FileInfo>();
List<string> fileTypes = new List<string>()
 {
     "*.jpg",
     "*.jpeg",
     "*.gif",
     "*.bmp",
     "*.png",
     "*.tif",
     "*.tiff"
 };

DirectoryInfo dir = new DirectoryInfo(Directory.GetCurrentDirectory());
foreach (string fileType in fileTypes)
{
    files.AddRange(dir.GetFiles(fileType));
}

var sortedFiles = files.OrderBy(f => f.LastWriteTime);

foreach (FileInfo file in sortedFiles)
{
    // do something with the FileInfo
}

If you are using C# 2 (so you don't have access to lambdas and Linq), it could look like this instead:

Directory.SetCurrentDirectory(@"C:\23055329\files\desktop wallpaper");
List<FileInfo> files = new List<FileInfo>();
List<string> fileTypes = new List<string>()
{
    "*.jpg",
    "*.jpeg",
    "*.gif",
    "*.bmp",
    "*.png",
    "*.tif",
    "*.tiff"
};

DirectoryInfo dir = new DirectoryInfo(Directory.GetCurrentDirectory());
foreach (string fileType in fileTypes)
{
    files.AddRange(dir.GetFiles(fileType));
}

files.Sort(new Comparison<FileInfo>(delegate(FileInfo x, FileInfo y)
{
    return x.LastWriteTime.CompareTo(y.LastWriteTime);
}));

foreach (FileInfo file in files)
{
    // do something with the FileInfo
    Console.WriteLine(file.ToString());
}