vb.net - Combine the second element of Array -


i have array of objects called orders holding list of item guids , quantity.

dim orders object(,) = {{"itema", 11}, {"itemb", 10}, {"itema", 2}, {"itemb", 1}}

i want convert following:

dim orders object(,) = {{"itema", 13}, {"itemb", 11}}

in other words, want have distinct select of items combined quantity of records item. can linq or should use loop?

you can use dictionary(of tkey, tvalue) group guid

dim orders object(,) = {{"itema", 11}, {"itemb", 10}, {"itema", 2}, {"itemb", 1}}  dim orderssum new dictionary(of string, int32)() orderindex int32 = 0 orders.getupperbound(0)     if orderssum.containskey(orders(orderindex, 0)) = true         orderssum(orders(orderindex, 0)) += orders(orderindex, 1)     else         orderssum.add(orders(orderindex, 0), orders(orderindex, 1))     end if next

then if dictionary type not allowed , need multidimensional array return type 

dim result object(,) = new object(orderssum.count - 1, 1) {} dim index int32 = 0 each key string in orderssum.keys     result(index, 0) = key     result(index, 1) = orderssum(key)     index += 1 next

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