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C#, Generic, Reuse of file enumeration

Posted on 2009-05-13

1 solution

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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...
GetFilesDoSomething

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)
            {
                method.Invoke(fi);
            }
        }
     }

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Question by:silentthread2k

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2 Comments

LVL 16

Expert Comment

by:ToddBeaulieu

ID: 243776802009-05-13

This looks like delegates 101, not generics.

Check this out:

http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_24247143.html

LVL 33

Accepted Solution

by:Todd Gerbert

Todd Gerbert earned 500 total points

ID: 243787362009-05-13

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));
 
		Console.ReadKey();
	
	}
 
}
 
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;
		else
			returnValue = false;
 
		return;
	}
 
	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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