Question

Had a class:

 class filedate
 {
      public int id;
      public string fname;
 }

Fill my list with values:

 List<filedate> List = ReadList(sqlFiles);
 string[] FolderFiles = System.IO.Directory.GetFiles(path2Copy);

Trying to get results:

  var results = List.Where(filedate =>
        FolderFiles.Any(x=>Path.GetFileNameWithoutExtension(x) ==             
        Path.GetFileNameWithoutExtension(filedate.fname)));

I have the same files in List and FolderFiles, but get no results in results. I am a newbie to Linq. Where is the problem?

update:
List: (count) > 1000
for example:
<1023, ‘tr_F2opervag_2808_1644.dat’>

FolderFiles example:
“\\domain.corp.dns\share\folder\tr_F2opervag_2808_1644.dat”

Update 2:
found out my mistake! Comment with intersection was helpful! This code is working:

  var results = List.Where(
            (filedate x) =>
            {
                return ! FolderFiles.Any(xxx =>
                Path.GetFileNameWithoutExtension(xxx) ==
                Path.GetFileNameWithoutExtension(x.fname));
            });

Answer 1

You’re code works fine for me so there’s something wrong with the format of your data in the List coming back from the database.

Post an example of an fname value from the filedata object. It needs to be a valid fully qualified path.

This works fine for me.

public class FileData{
    public int id;
    public string fname;
}
void Main()
{
    List<FileData> list = new List<FileData>{
        new FileData { id=1, fname="C:\\install.res.1042.dll"},
        new FileData { id=2, fname="C:\\install.res.1041.dll" },
        new FileData { id=3, fname="C:\\install.res.9999.dll"}
    };

    string[] FolderFiles = System.IO.Directory.GetFiles("C:\\");

    var results = list
        .Where(fd => 
            FolderFiles.Any(x=>Path.GetFileNameWithoutExtension(x) ==             
            Path.GetFileNameWithoutExtension(fd.fname)));

    Console.WriteLine(results);
}