web.EnsureUser() doesn't work for multi user and group

Question

I update sharepoint list by code. In list I have people picker field. It allows multi userand SharePoint group also. Before allowing multi user and group it was allowed only single user. So I used below code amd it was worked fine.

SPUser user = web.EnsureUser("ApproverField");
listItem["Approver"]=user;
web.AllowUnsafeUpdates = true;
listItem.Update();

Now after changed to allow multi user and SharePoint group this code doesn't work. Exception fires at web.EnsureUser(). So can anyone suggest to make the change?

Answer 1

you can use the below function to store multiple users in People Picker

public SPFieldUserValueCollection GetSelectedUsers(PeopleEditor editor)
    {
        string selectedUsers = editor.CommaSeparatedAccounts;
        char[] splitter = { ',' };
        string[] splitPPData = selectedUsers.Split(splitter);
        SPFieldUserValueCollection values = new SPFieldUserValueCollection();
        for (int i = 0; i < splitPPData.Length; i++)
        {
            string loginName = splitPPData[i];
            if (!string.IsNullOrEmpty(loginName))
            {
                SPUser user = SPContext.Current.Web.SiteUsers[loginName];
                SPFieldUserValue fuv = new SPFieldUserValue(SPContext.Current.Web, user.ID, user.LoginName);
                fuv = new SPFieldUserValue(SPContext.Current.Web, user.ID, user.LoginName);
                values.Add(fuv);
                        }
                    }
                    return values;
    }

Answer 2

Try following:

SPFieldUserValueCollection values = (SPFieldUserValueCollection)item["MultipleUsersField"];
values.Add(new SPFieldUserValue(web, user.ID, user.Name));
item["MultipleUsersField"] = values;

http://www.c-sharpcorner.com/uploadfile/dhananjaycoder/multiple-user-insertion-in-sharepoint-list/