Look up value based on a key.
Source position: db.pas line 282
| public function TLookupList.ValueOfKey( | 
| const AKey: Variant | 
| ):Variant; | 
| AKey | 
 | Key to find associated value for. | 
Resulting value or Null.
ValueOfKey does a value lookup based on a key: it returns the value in the list that matches the AKey key. If none is found, Null is returned. This mechanism is quite slow, as a linear search is performed.
| 
 | Find the first key that matches a value. | |
| 
 | Add a key, value pair to the list. |