CClash.FileUtils.FileMissing C# (CSharp) Method

        public static bool FileMissing(string path)
        {
            var sb = new StringBuilder(path);
            return !PathFileExists(sb);
        }

        public List <string> GetPotentialIncludeFiles(IEnumerable <string> incdirs, IEnumerable <string> incfiles)
        {
            List <string> possibles    = new List <string>();
            List <string> includelines = new List <string>();
            var           fullSrc      = Path.GetFullPath(SingleSourceFile);

            foreach (var d in incdirs)
            {
                foreach (var f in (from x in incfiles where x.StartsWith(d, StringComparison.CurrentCultureIgnoreCase) select x))
                {
                    if (f != fullSrc)
                    {
                        var incpath = f.Substring(d.Length);
                        includelines.Add(incpath.TrimStart('\\'));
                    }
                }
            }

            HashSet <string> tmp = new HashSet <string>(includelines);

            foreach (var y in tmp)
            {
                foreach (var x in incdirs)
                {
                    var p = Path.Combine(x, y);
                    if (FileUtils.FileMissing(p))
                    {
                        possibles.Add(p);
                    }
                    else
                    {
                        break;
                    }
                }
            }

            return(possibles);
        }