%ERROR built-in function returns True if the most recent operation with error operation extender specified resulted in an error condition.
%ERROR
This is the same as the error indicator being set on for the operation. Before an operation with an error operation extender begins, %ERROR is set to return False and remains unchanged following the operation if no error occurs. All operations that allow an error indicator can also set or reset the %ERROR built-in function.
The implementation of RPGIV's %ERROR built-in function is that each program has its own %ERROR. The "program" analog in a .NET Windows application is the current thread. %ERROR is NOT unique per class - it can be used by shared and non-shared members. %ERROR is a per-thread shared flag, and is therefore thread-safe when used in multithreading. %ERROR is stored in thread local storage using Thread.GetNamedDataSlot and Thread.SetData (which means it cannot be quickwatched). Because all AVR .NET objects in the thread share the same %ERROR built-in function, use of the Try/Catch/Throw is advised when you need more granular error handling.
CHAIN From(myfile) Key(myKey) Err(*EXTENDED)
If %Error
.
. // error handling here
.
Endif