C#, Generic, Reuse of file enumeration

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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