C# SSOM turn on List Rating settings

Question

I have been using the method described here by attempting to use reflection to turn on the Rating Settings of a list. However, I get the following error:

Exception Message: exception has been thrown by the target of an invocation

Stacktrace Message: Value cannot be null.Parameter name: serviceContext

Here is my attempt:

//Create the list Guid id = web.Lists.Add("Board Name", "Board Desc", SPListTemplateType.DiscussionBoard); web.Update(); //Retrieve the list I just created SPList discBoardList = web.Lists[id]; //Attempt to turn on the Rating Settings for the newly created list Type type = typeof(Microsoft.SharePoint.Portal.RatingsSettingsPage); MethodInfo mi = type.GetMethod("EnableRatings", BindingFlags.Static | BindingFlags.NonPublic); mi.Invoke(null, new object[] { discBoardList, true }); //EXCEPTION THROWN

How do I resolve this issue? Or more importantly is there an easier/better way to turn on Rating Settings for a SharePoint list programmatically?

Vishwas Goswami · Accepted Answer · 2015-08-03 04:52:23Z

are you creating your list programmatically or it is generated using the OOTB options ?

if you are creating the list programmatically then you can use the below method to enable ratings in your list schema.

Add this to your default view (or any view you want) in Definition Schema of the List

<ViewFields> <FieldRef Name="AverageRating" /> <FieldRef Name="RatingCount" /> </ViewFields>

Edit

Follow this link

You will have to create a content type containing the references of the ratings field and will have to add that content type in the list schema.

I am not very much sure about it but you can also try This Link as well and see if it solves your problem

Yes I am creating the list programmatically. Per your suggestion I tried: SPView view = discBoardList.DefaultView; view.ViewFields.Add("AverageRating"); view.ViewFields.Add("RatingCount"); view.Update(); But go the Item does not exist. It may have been deleted by another user exception thrown. Please advise. — KidBatman
– KidBatman, Commented Jul 31, 2015 at 16:17
Do you have any control over the XML defined schema of the list.? — Vishwas Goswami
– Vishwas Goswami, Commented Aug 3, 2015 at 4:44
have you seen the edit for the answer i made and checked both of the links in it ? — Vishwas Goswami
– Vishwas Goswami, Commented Aug 4, 2015 at 4:19

KidBatman · Accepted Answer · 2015-08-17 19:38:33Z

As a workaround I just grab the default "Discussions List" that is created when creating a Community site. When I start adding the list items all numbers in What's Happening come out correctly.

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