如何使用C＃连续读取文件夹中的文件？

Question

I'd like to continuously read in all image files from a folder on my local drive, then do some processing and end the program once all images have been read. The images numbers are not sequential they are random however they are located in a single folder. Currently my program can only read in one file; see code below

string imagePath = Path.Combine(Freconfig.GetSamplesFolder(), "24917324.jpg");

Answer 1

use FileSystemWatcher https://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher(v=vs.110).aspx

FileSystemWatcher watcher = new FileSystemWatcher();
    watcher.Path = Freconfig.GetSamplesFolder();
    watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
       | NotifyFilters.FileName | NotifyFilters.DirectoryName;
    watcher.Filter = "*.jpg";

    // Add event handlers.
    watcher.Changed += new FileSystemEventHandler(OnChanged);
    watcher.Created += new FileSystemEventHandler(OnChanged);
    watcher.Deleted += new FileSystemEventHandler(OnChanged);
    watcher.Renamed += new RenamedEventHandler(OnRenamed);

    // Begin watching.
    watcher.EnableRaisingEvents = true;

before starting watcher, use directorylisting to find all existing files and process them, then use watcher

Answer 2

Is this what you are looking for? Directory.GetFiles(@"..\\somepath") ( MSDN )

Answer 3

You could try:

directoryInfo = new DirectoryInfo("C:/YOUR/DIRECTORY/HERE]");
var files = directoryInfo.GetFiles("*.jpg").OrderBy(x => x.CreationTimeUtc);
foreach (var file in files)
{
 //Your processing
}

Note this will get all the .jpg files in a directory. The foreach loop will start with the oldest files first.

Answer 4

This should get all the files in a directory:

 private List<FileInfo> GetFileInfo()
    {
        string path = @"C:\MyPath";
        List<FileInfo> files = new List<FileInfo>();
        DirectoryInfo di = new DirectoryInfo(path);

       //TopDirectoryOnly if you don't want subfolders
        foreach (FileInfo f in di.GetFiles("*.jpg", SearchOption.TopDirectoryOnly))
        {
            files.Add(f);
        }

        return files;
    }

Then in your code, iterate over the returned collection and do whatever work you need to do with them.