example file list

fileListGetter.cs

using System.IO;


// list init for file info dto
List<TargetFileInfoDTO> fileInfoList = new List<TargetFileInfoDTO>();

// root file path (dds, jpg file root path)
string ROOT_FILE_PATH = @"FILE_PATH";

// search option dict 
string SEARCH_FILE_FORMAT = "jpg";
Dictionary<string, string> searchOptionDict = new Dictionary<string, string>() {
    { "jpg" , "*.jpg" },
    { "dds" , "*.dds" }
};

// ienumerator init 
IEnumerator<FileInfo> jpgFile = 
     new DirectoryInfo(ROOT_FILE_PATH).EnumerateDirectories("*", SearchOption.TopDirectoryOnly).GetEnumerator().
     Current.EnumerateFiles(searchOptionDict[SEARCH_FILE_FORMAT], SearchOption.AllDirectories).GetEnumerator();

// get file (one by one) ---> end
while (jpgFile.MoveNext()) {
        // dto init
        TargetFileInfoDTO fileInfoDTO = new TargetFileInfoDTO();

        fileInfoDTO.filePath = jpgFile.Current.FullName;
        fileInfoDTO.fileName = jpgFile.Current.Name.Replace(
            string.Format(".{0}", SEARCH_FILE_FORMAT), ""
        );
        fileInfoDTO.fileFormat = SEARCH_FILE_FORMAT
        // add file info dto
        fileInfoList.Add(fileInfoDTO);
    }

// dto example
public class TargetFileInfoDTO
{
    public string filePath { get; set; }
    public string fileName { get; set; }
    public string fileFormat { get; set; }
}


// get file list...

foreach(TargetFileInfoDTO fileInfoDTO in fileInfoList) {
    
    fileInfoDTO.filePath
    fileInfoDTO.fileName
    fileInfoDTO.fileFormat
    // todo some work.

}