how to read files in folder in ascending order?

问题

i have folder that contain image files which named with number 1,2,3...
how do i read the image file name in sequence starting with 1 until the end(whatever number it is).

回答1:

You may use OrderBy on file array.

DirectoryInfo dir = new DirectoryInfo(@"C:\yourfolder");
FileInfo[] files = dir.GetFiles();
//User Enumerable.OrderBy to sort the files array and get a new array of sorted files
FileInfo[] sortedFiles = files.OrderBy(r => r.Name).ToArray();

For File number with just numeric(int) names try:

FileInfo[] sortedFiles = files
                          .OrderBy(r => int.Parse(Path.GetFileNameWithoutExtension(r.Name)))
                          .ToArray();

回答2:

Habib's answer is correct, but note that you won't get the results in numerical order (i.e. you'll process 10.png before you process 2.png). To sort the filenames numerically, instead of alphabetically:

foreach (string fileName in Directory.GetFiles(Environment.CurrentDirectory)
         .OrderBy((f) => Int32.Parse(Path.GetFileNameWithoutExtension(f1))))
{
    // do something with filename
}

回答3:

Read all filenames into an array. Sort the array elements in ascending order. Done!

回答4:

Collect all the file names inside the directory using Arraylist and sort them (It also appicable for alpha numeric file names

        ArrayList <String> dirFiles=new ArrayList<String>();
        File file = new File("DirectoryPath");

        File createdFile = null;
        String [] str=file.list();
        for(int j=0;j<str.length;j++){
            dirFiles.add(str[j]);               
        }

        CustomComparator comparator = new CustomComparator();
        Collections.sort(dirFiles, comparator);
        for(String fileName: dirFiles){
                 Console.println(fileName);
         }

来源：https://stackoverflow.com/questions/12907499/how-to-read-files-in-folder-in-ascending-order

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