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C#, Generic, Reuse of file enumeration

Posted on 2009-05-13
Last Modified: 2013-12-17
I'm trying to use my FileWorks class below to tell me if a directory has a certain file extension.
I'm trying to be as generic as possible and reuse the function...

I'm not sure how to approach this one. This is the code I have below.

Does not look like it would work if I were to call it...

FileWorks filework = new FileWorks();
filework.GetFilesDoSomething(directory, CheckDirectoryForFilesWithExtension);

How can I pass the bool result back accross soo many functions?

public class FileWorks
        bool CheckDirectoryForFilesWithExtension(FileInfo fi)
            if (fi.Extension == "tif")
                return true;
        public void GetFilesDoSomething(string DirName, Action<FileInfo> method)
            DirectoryInfo d = new DirectoryInfo(DirName);
            FileInfo[] f = d.GetFiles();
            foreach (FileInfo fi in f)

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Question by:silentthread2k
LVL 16

Expert Comment

ID: 24377680
This looks like delegates 101, not generics.

Check this out:


LVL 33

Accepted Solution

Todd Gerbert earned 500 total points
ID: 24378736
This codes isn't really "proper", but it does demonstrate using a delegate to make your GetFilesDoSomething() re-usable.
class Program
	static void Main(string[] args)
		FileWorks.GetFilesDoSomething("C:\\", new FileWorks.SomethingDelegate(FileWorks.CheckDirectoryForFilesWithExtension));
public static class FileWorks
	public delegate void SomethingDelegate(object inParam, out object returnVal);
	public static void CheckDirectoryForFilesWithExtension(object fi, out object returnValue)
		if (((FileInfo)fi).Extension.ToLower() == ".tif")
			returnValue = true;
			returnValue = false;
	public static void GetFilesDoSomething(string dirName, SomethingDelegate method)
		DirectoryInfo d = new DirectoryInfo(dirName);
		FileInfo[] f = d.GetFiles();
		foreach (FileInfo fi in f)
			object returnValue;
			method(fi, out returnValue);
			Console.WriteLine("{0} is a TIF: {1}", fi.Name, (bool)returnValue);

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