How to change a field value during the ItemUpdating event

Question

Hi

I am trying to set the value of a field on a ListItem in an event receiver but its not working

All i am doing during the event is

properties.AfterProperties[<field internal name>] = 1;

No errors are thrown but the the field i'm setting does not change. I have also tried

properties.ListItem[<field internal name>] = 1;
properties.ListItem.Update();

Have also tried SystemUpdate();

I know i am meant to be setting the afterproperties but think i am missing an obvious step.

Thanks

Answer 1

The ItemUpdating is used for validation. If you want to set the values of fields, do it in the ItemUpdated event instead.

Answer 2

By the way, do not forget to call DisableEventFiring, because guess what happens when you call Update method? ItemUpdated event gets called again and you go into an endless loop...

Answer 3

Keep in mind, that depending on whether your event receiver runs on a list or library you may need to use different properties (see this link for more info).

Assuming you are in the ItemUpdating method running on a list, all you should need is:

base.ItemUpdating(properties);
properties.AfterProperties["InternalName"] = 1;

(no updates required since you are changing the value before it gets saved)

I would verify that your Event Receiver is attached to the list. Are you able to debug your Event Receiver when you modify an item in the list?

Answer 4

You can add the value in the Item Adding event using the AfterProperties.ListItem[]=;