CODEWITHSUNDEEP
c#sharepointevents
Buzzby
Buzzby

Reputation: 291

How to change a field value during the ItemUpdating event

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

Upvotes: 3

Views: 26351

Answers (6)

Gil Roitto
Gil Roitto

Reputation: 335

It is nice to update Title in ItemAdding and ItemUpdating events since extra Updates are avoided (without DisableEventFiring), and the "Edit Properties view" will already have the Title filled in

Some code example to update title based on filename. Works for Document Library and Picture Library. For working with Title in Lists, ["Title"] needs to be used.

public override void ItemAdding(SPItemEventProperties properties)
{
    base.ItemAdding(properties);
    string currTitle = properties.AfterProperties["vti_title"] as string;
    string url = properties.AfterUrl;
    var name = url.Substring(url.LastIndexOf('/') + 1);
    //NOTE! Name is only copied to Title if title is not set. Will not handle name changes!
    if (string.IsNullOrEmpty(currTitle))
    {
        properties.AfterProperties["vti_title"] = name;
    }
}

Upvotes: 0

Ashish Madkaikar
Ashish Madkaikar

Reputation: 129

You can update values of a field in ItemUpdating also, this works for me.

properties.AfterProperties["FieldName"] = "computedvalue";
base.EventFiringEnabled = false; properties.ListItem.SystemUpdate(false);
base.EventFiringEnabled = true;

Upvotes: 0

imSantoshKumar
imSantoshKumar

Reputation: 194

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

Upvotes: 1

Kit Menke
Kit Menke

Reputation: 7056

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?

Upvotes: 11

Janis Veinbergs
Janis Veinbergs

Reputation: 6988

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...

Upvotes: 2

Rob Windsor
Rob Windsor

Reputation: 6859

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

Upvotes: 0

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