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I would like to create a people-picker user field where more than one user can be chosen.

Currently, this is what I'm doing:

SPField field = new SPField(contentType.Fields, "User", "Users");
SPFieldLink fieldLink = new SPFieldLink(field);
contentType.FieldLinks.Add(fieldLink);
contentType.Update();

However, I imagine this only creates a field to select a single user.

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2 Answers

up vote 2 down vote accepted

Cast it to an SPFieldUser, or create an SPFieldUser in the first place, and set AllowMultipleValues to true.

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you can use only AddFieldAsXml because Multiselect User Field is marked as non-UserCreatable :)

list.fields.AddFieldAsXml(<Field Type="UserMulti" DisplayName="My_User_Field" Required="FALSE" UserSelectionMode="PeopleAndGroups" UserSelectionScope="0" Mult="TRUE" Sortable="FALSE" ID="{7293d78b-f9b3-4cce-b85f-ac499fc4fcf2}")
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Where is it documented that it's non-user creatable? I think I missed it on my quick scan of MSDN... –  James Love Jun 6 '11 at 15:41
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