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C#, Generic, Reuse of file enumeration

Posted on 2009-05-13
2
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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
2 Comments
 
LVL 16

Expert Comment

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

Check this out:

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


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LVL 33

Accepted Solution

by:
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));
 

		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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