updated about 1 month ago
The backend decorator tells the platform what you want to do with the values stored inside the variables used by your custom action.
[BEDecorator(IOProperty = Direction.Output)]
The IOProperty property allows you to choose one of four possible directions, that will give you more control on over your custom action:
NONE = 0, Input = 1, InputOutput = 2, Output = 3,
The most useful are Input and Output. While using Input the custom action expects to receive the value from the user and with Output it will return a value that could be one or more inputs that were used internally.
The None option is the default if the IOProperty is not mentioned.
The InputOutput option is used when a property needs to be both input and output, because it must first receive a value before it uses it in the backend.