c# - Best way to parse AlphaNumeric string, parts of which will be converted to Int, Bool, String -

i have schema according alphanumeric string of specific length interpreted. example, index 0-12 interpret string, 13-20 interpreted int, 21-22 bool , on. far, have linked list formed @ runtime, each element(struct) has 2 fields: length , type(enum). iterating through list , checking type element belongs to, correct conversion performed.
seems method inefficient , error prone task. there better way ?

assuming stuck fixed-width data source (which should avoid if @ possible extremely non human-readable), use attributes directly decorate class data deserialized. like:

class somedto {     [position(0,12)]     public string somestring { get; set; }      [position(13, 20)]     public int someint { get; set; }      [position(21-25)]     public bool somebool { get; set; } } 

and write deserializer picks type property directly , column position attribute. way, information deserializing kept in 1 place, reducing risks of typo errors.