PhotoSorter/PhotoSorter/Program.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace PhotoSorter
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("This application can sort photos in CURRENT directory by EXIF shotdate Or it's Filename, move the photos to a NEW sub-Directory which created by date like \"2017-10-01\". Hansi 2017-10-21");
            Console.WriteLine("Press any key to DO it...");
            Console.ReadKey();
            string folderIn = AppDomain.CurrentDomain.BaseDirectory;
            string[] extArray = new string[] {".jpg",".jpeg",".dng",".nef"};
            
            doWork(folderIn, extArray);
            Console.WriteLine("Done!");
            Console.ReadKey();
        }
        static void doWork(string folderIn,string[] extArr)
        {
            for (int exti = 0; exti < extArr.Length; exti++)
            {

                Console.WriteLine("---------Working with " + extArr[exti] + " files!--------------");
                var files = Directory.GetFiles(folderIn, "*" + extArr[exti], SearchOption.TopDirectoryOnly);
                int k = 0;
                Console.WriteLine("Total:" + files.Length.ToString());
                foreach (var file in files)
                {
                    k++;
                    FileInfo fi = new FileInfo(file);
                    Console.WriteLine(k.ToString() + "/" + files.Length.ToString() + "\t" + fi.Name);
                    string newFileName;
                    if ((fi.Attributes & FileAttributes.Hidden) != FileAttributes.Hidden)
                    {
                        var dateTaken = GetDateTakenFromImage(file);
                        if (dateTaken == DateTime.MinValue)
                        {
                            Console.WriteLine("ignore " + fi.Name + ":Get Exif Fail");
                            Console.WriteLine("Trying to get Date From filename...");
                            dateTaken = GetDateFromImageFileName(file);
                            if (dateTaken == DateTime.MinValue)
                            {
                                Console.WriteLine("ignore " + fi.Name + ":Get Date By File Name Fail");
                                continue;
                            }
                        }

                        //dateTaken = dateTaken.AddHours(hourOffset);
                        //dateTaken = dateTaken.AddMonths(monthOffset);

                        var newDir = Path.Combine(Path.GetDirectoryName(file), dateTaken.ToString("yyyy-MM-dd"));

                        newFileName = Path.Combine(newDir, Path.GetFileName(file));

                        if (!Directory.Exists(Path.GetDirectoryName(newFileName)))
                        {
                            Directory.CreateDirectory(Path.GetDirectoryName(newFileName));
                        }

                        //newFileName = Path.Combine(Path.GetDirectoryName(file), dateTaken.ToString("yyyy-MM-dd HHmm.ss") + " " + postfix + ".jpg");

                        if (file != newFileName)
                        {
                            int i = 1;
                            while (File.Exists(newFileName))
                            {
                                newFileName = Path.Combine(Path.GetDirectoryName(file), dateTaken.ToString("yyyy-MM-dd HHmm.ss") + " " + i++ + ".jpg");
                            }
                            Debug.Assert(!File.Exists(newFileName));

                            File.Move(file, newFileName);
                        }
                    }
                } 
            }
        }
        /// <summary>
        /// We init this once so that if the function is repeatedly called
        /// It isn't stressing the garbage man
        /// </summary>
        private static Regex r = new Regex(":");

        /// <summary>
        /// Retrieves the datetime WITHOUT loading the whole image
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static DateTime GetDateTakenFromImage(string path)
        {
            try
            {
                using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
                using (Image myImage = Image.FromStream(fs, false, false))
                {
                    PropertyItem propItem = myImage.GetPropertyItem(36867);
                    string dateTaken = r.Replace(Encoding.UTF8.GetString(propItem.Value), "-", 2);
                    return DateTime.Parse(dateTaken);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return DateTime.MinValue;
            }
        }
        public static DateTime GetDateFromImageFileName(string path)
        {
            //not finished try to get name from filename. yyyyMMdd or yyyy-MM-dd
            string fn = Path.GetFileNameWithoutExtension(path);
            Regex r1 = new Regex(@"20\d{6}");
            Regex r2 = new Regex(@"20\d{2}-\d{2}-\d{2}");
            if (r1.IsMatch(fn))
            {
                string ff = r1.Match(fn).Value;
                return DateTime.Parse(ff.Substring(0,4)+"/" + ff.Substring(4,2) + "/" + ff.Substring(6,2));
            }
            if (r2.IsMatch(fn))
            {
                string ff = r2.Match(fn).Value;
                return DateTime.Parse(ff);
            }

            return DateTime.MinValue;

        }


    }
}