entity framework - EF Code-first: Increment a non-autoincremented field manually -


i´m using existing database our erp.

in database tables, there float field called "r_e_c_n_o_", field not auto-incremented database , can´t change it.

for added entities increment field "r_e_c_n_o_", how acomplish in dbcontext´s savechanges() method?

using ado.net i´d that:

    public static int getnext(string tablename, string fieldname)     {         var cmd = _conn.createcommand(string.format("select max({0}) + 1 {1}", fieldname, tablename));         var result = (int)cmd.executescalar();         return result;     }

update: please take in comment below, need solve problem:

    public override int savechanges()     {         var entries = this.changetracker.entries();         dictionary<string, int> lastrecnos = new dictionary<string, int>();         foreach (var entry in entries)         {             var typename = entry.entity.gettype().name;              if (lastrecnos.containskey(typename))                 lastrecnos[typename]++;             else                 lastrecnos[typename] = 0;//how can max here?              int nextrecnoforthisentity = lastrecnos[typename];              var entity = entry.entity entitybase;             entity.recno = nextrecnoforthisentity;           }         return base.savechanges();     }

tks, william


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