SAP B1 Forms Session

Forms Session

One of the difficulties when dealing with SAP B1 is the “stateless” condition that object have between events fired on the UI.

If one creates a class that handles the events for a given form then just creating a simple static variable would solve the “stateless” problem, but when you wish to have more then one instance of the form then this approach does not work.

To work around this I came up with the class below, which uses the FormUID (the unique identifier of the form) to identify the object that belongs to it. Meaning that you create your object and store it by using the FormUID as the key.

When an event gets fired you simply ask the FormsSession object to return you the object stored for the FormUID. This takes care of both problems, the “stateless” condition and the single class object.

One thing not to forget is to remove the object from the Session when the form closes (or like I intent to do, improve this class to auto-register to the close event and remove the stored object automatically).

public class FormsSession<T> where T : class, new()

{

private static Dictionary<string, T> _container = new Dictionary<string, T>();

public void Add(string FormUID, T FormObject)

{

if (_container.ContainsKey(FormUID))

_container[FormUID] = FormObject;

else

_container.Add(FormUID, FormObject);

}

public T Get(string FormUID)

{

if (!_container.ContainsKey(FormUID))

_container.Add(FormUID, new T());

return _container[FormUID];

}

public void Remove(string FormUID)

{

if (_container.ContainsKey(FormUID))

_container.Remove(FormUID);

}

}