find files with same names but different extensions in a folder

Question

I have an FTP server which stores files sent/uploaded by the client in a certain folder. The client will upload 3 files with same names but different extensions. For example,the client will send file1.ext1,file1.ext2 and file1.ext3. I am looking for a piece of code which will help me find files with same names("file1") and then zip them. Any help is appreciated. I have written this code which gets the name of all the files in the folder:

string path = "somepath";
String[] FileNames = Directory.GetFiles(path);

Answer 1

This is fairly simple to do:

string path = "somepath";
String[] FileNames = Directory.GetFiles(path);

You can use LINQ to group the files by their name, without extension:

var fileGroups = from f in FileNames
    group f by Path.GetFileNameWithoutExtension(f) into g
    select new { Name = g.Key, FileNames = g };

// each group will have files with the
// same name and different extensions
foreach (var g in fileGroups)
{
    // initialize zip file
    foreach (var fname in g.FileNames)
    {
        // add fname to zip
    }
    // close zip file
}

Update

The task isn't too much more difficult if you don't have LINQ. First, you want to sort the files:

Array.Sort(FileNames);

Now, you have a list of files, sorted by file name. So you'll have, for example:

file1.ext1
file1.ext2
file1.ext3
file2.ext1
file2.ext2
etc...

Then just go through the list, adding files with the same base name to zip files, as below. Note that I don't know how you're creating your zip files, so I just made up a simple ZipFile class. You'll of course need to replace that with whatever you're using.

string lastFileName = string.Empty;
string zipFileName = null;
ZipFile zipFile = null;
for (int i = 0; i < FileNames.Length; ++i)
{
    string baseFileName = Path.GetFileNameWithoutExtension(FileNames[i]);
    if (baseFileName != lastFileName)
    {
        // end of zip file
        if (zipFile != null)
        {
            // close zip file
            ZipFile.Close();
        }
        // create new zip file
        zipFileName = baseFileName + ".zip";
        zipFile = new ZipFile(zipFileName);
        lastFileName = baseFileName;
    }
    // add this file to the zip
    zipFile.Add(FileNames[i]);
}
// be sure to close the last zip file
if (zipFile != null)
{
    zipFile.Close();
}

I don't know if the Compact Framework has the Path.GetFileNameWithoutExtension method. If not, then you can get the name without extension by:

string filename = @"c:\dir\subdir\file.ext";
int dotPos = filename.LastIndexOf('.');
int slashPos = filename.LastIndexOf('\\');
string ext;
string name;
int start = (slashPos == -1) ? 0 : slashPos+1;
int length;
if (dotPos == -1 || dotPos < slashPos)
    length = filename.Length - start;
else
    length = dotPos - start;
string nameWithoutExtension = filename.Substring(start, length);