System.Collections.Specialized.StringCollection.GetEnumerator C# (CSharp) Метод

        public System.Collections.Specialized.StringEnumerator GetEnumerator() { throw null; }
        public int IndexOf(string value) { throw null; }

 private static bool CheckFileNameUsingPaths(string fileName, StringCollection paths, out string fullFileName)
 {
     fullFileName = null;
     string str = fileName.Trim(new char[] { '"' });
     FileInfo info = new FileInfo(str);
     if (str.Length != info.Name.Length)
     {
         if (info.Exists)
         {
             fullFileName = info.FullName;
         }
         return info.Exists;
     }
     using (StringEnumerator enumerator = paths.GetEnumerator())
     {
         while (enumerator.MoveNext())
         {
             string str3 = enumerator.Current + Path.DirectorySeparatorChar + str;
             FileInfo info2 = new FileInfo(str3);
             if (info2.Exists)
             {
                 fullFileName = str3;
                 return true;
             }
         }
     }
     return false;
 }