How to exclude an array from search in C#

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I've an array. Let's say;

C#

private string[] WhiteList =
     {
        "abcxyz.cs",
        "mouseapi.dll",
        "SensitivtyFix.asi",
        "drake.mp3"
     };

C#

private string[] SuspectedFiles =
        {
            ".cs",
            "d3d9.dll",
            "sqlite3.dll",
            "mod_sa.ini",
            "mod_sa.raw",
            ".cleo",
            ".asi"
        };

Now I want to exclude that array from a directory/file search. How do I achieve that?

For this search, I'm using another array called SuspectedFiles from which I could fetch desired files but I'm unable to exclude files from the array Whitelist.

Any help would be great. Thank You.

What I have tried:

This is my code that I've used and got no success. I could get results of files from SuspectedFiles array but couldn't remove files contained in Whitelist array from the search results.

C#

private void VerifySuspectedFiles()
        {
            listBox1.Enabled = true;

            DirectoryInfo DirInf = new DirectoryInfo(GetGtaRegistryPath());
            int GetSize = SuspectedFiles.GetLength(0);

            if (!DirInf.Exists)
            {
                MessageBox.Show("This directory does not exist!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

                return;
            }

            if (GetSize == 0)
            {
                return;
            }

            for (int i = 0; i < GetSize; ++i)
            {
                foreach (var File in DirInf.GetFiles("*", SearchOption.AllDirectories))
                {
                    if (File.FullName.Contains(SuspectedFiles[i]) && !File.FullName.Contains(WhiteList[i]))

                    {
                        listBox1.Items.Add("File: " + File.FullName);
                    }
                }
            }
        }

Posted 15-May-17 21:59pm

Sai Parthiv

Updated 15-May-17 22:18pm

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OriginalGriff · Accepted Answer · 2017-05-15T22:18:00

For starters, You probably want to think a bit more about what you are checking for: the Contains test for Suspected Files will work - but is liable to false positives - but the white list using Contains is going to remove positive matches that it shouldn't. For example, if the "bad file" is called "VirusInfectedmouseapi.dll" it will pass your white list because it contains "mouseapi.dll".

I'd change it about: by all means have a list of "OK files" and "bad files" but also have a list of "bad extensions" and use the Path functions to extract the file name and the file extension for checking:

C#

string filenameWithExtension = Path.GetFileName(File.FullName);
string FileNameWithoutExtension = Path.GetFileNameWitoutExtension(File.FullName);
string extensionWithDot = Path.GetExtension(File.FullName);

You can then do equality matching instead of Contains, and reduce the number of problems you might get.
I'd also convert all filenames to lowercase before I check them - the system doesn't care about case in filenames but string comparisons do, by default.