将目录路径及其中的文件存储为可观察的集合

Question

I have a program where I store directory inputs with files inside of that directory eg

C:/Documents
 C:/Documents/1.jpg
 C:/Documents/2.jpg

What would be the best data structure to store it so I could easily loop for just input directories or just by files or when I delete the directory the file would be delete as well.

I was thinking about using dictionary, but it has to also be observable.

What I use currently

private ObservableCollection<string> inputDirectories new ObservableCollection<string>();;
private ObservableCollection<string> inputFiles = new ObservableCollection<string>();

This solution doesn't really give me a lot of choices, I can't just get input episodes for certain input directory since they are in no way connected. When I delete inputDirectory I would have to loop and compare the input directory with my inputfiles to delete only files for that directory.

Answer 1

if you use the DirectoryInfo class from the System.IO namespace rather than a plain string, you can get the files included in this directory via the GetFiles method. You can then expose the list of all Files in a Property using LINQ. Just make sure that you fire a OnPropertyChanged for this property whenever the inputDirectories change.

private ObservableCollection<DirectoryInfo> inputDirectories = new ObservableCollection<DirectoryInfo>();

inputDirectories.Add(new DirectoryInfo(@"C:\Documents"));

public IEnumerable<string> Files => inputDirectories.SelectMany(d => GetFilesInDirectory(d));

private IEnumerable<string> GetFilesInDirectory(DirectoryInfo directory)
  {
     return directory.GetFiles().Select(x => x.FullName);
  }

Answer 2

I was thinking about using dictionary, but it has to also be observable.

There is no such class that implements both the IDictionary interface and the INotifyCollectionChanged interface available in the .NET Framework, ie there is no hybrid between a dictionary and an ObservableCollection<T> available, so you will have to create your own custom class.

You could take a look at the ObservableDictionary<TKey, TValue> class provided here: http://blogs.microsoft.co.il/shimmy/2010/12/26/observabledictionarylttkey-tvaluegt-c/

An observable dictionary is indeed what you need.

Answer 3

You should store directory in Dictionary. Key should be directory and value should be inner directory or file.