If a set the LookupCache to True they read, but generates error on insert: can`t convert null to string. If a set the LookupCache to False they don`t read, but is able to insert and modify.

Anyone knows anything about it?

Sorry, they are not able to insert or modify, they make nothing when LookupCache is False.

Everton Vieira wrote

If a set the LookupCache to True they read, but generates error on insert: can`t convert null to string. If a set the LookupCache to False they don`t read, but is able to insert and modify. Anyone knows anything about it?

Everton Vieira wrote

Sorry, they are not able to insert or modify, they make nothing when LookupCache is False.

What Lazarus version are using?

Versions from trunk have no difference when LookupCache is True or False

Can you post a simple example?

Luiz

In the version 0.9.31 work out.

But as i said in the bug tracker, i`ve used a dblookupcombobox with a memdataset because i needed to list some values and save others, the keys. Despite i had a fixed list of values i had to use a dblookupcombobox instead of a simple dbcombobox because he does not have any option to list some values and save others like the dbradiogroup has. Which is a common use of it, by example, to list the names and save the initials only. Well, let here too an appel, that i`m sure would be a lot of useful in a lot of cases.