Checking if a list exists before adding a new one using feature?

Question

I am trying to create a few lists using features so that these custom lists are created automatically as soon as the feature is activated on a team site. The feature is scoped at a site level. Is it possible to check weather a list already exists in a site collection before adding a new list using feature? I tried to do this check on feature activated event which gave me error saying list with same name already exists. Any help will be greatly appreciated. Thanks

vvk · Accepted Answer · 2012-07-25T10:11:51.833

1

public static class SPWebHelper
{
    public static bool IsListExistByTitle(this SPWeb web, string title)
    {
         return web.Lists.Cast<SPList>().FirstOrDefault(
                        list => list.Title == title) != null;
    }


    public static bool IsListExistByInternalName(this SPWeb web, string internalName)
    {
         return web.Lists.Cast<SPList>().FirstOrDefault(
                        list => list.RootFolder.Name == internalName)!=null;
    }
}

call extension function

bool existlist = SPContext.Current.Web.IsListExistByTitle("YourListTitle");

edited Jul 25 '12 at 10:11

answered Jul 25 '12 at 08:10

vvk

833
5
16

in this Lists.Cast gives an error do we need to add any reference or any using directive? – Sree Kuttan Jul 25 '12 at 08:54
add your cs file: using Microsoft.SharePoint; – vvk Jul 25 '12 at 09:32
its already added still error exist. i'm using sp 2010 nd vs 2010 c# – Sree Kuttan Jul 25 '12 at 09:40
should also be: using System.Linq; – vvk Jul 25 '12 at 09:44
nope it do not work. it gives error for saying "Extention method must be defined in a non-generic static class". it would be as its a static method tried using it as a non static method that do not work either. – Sree Kuttan Jul 25 '12 at 10:05
Thank you very much for your help. Just a slight altercation to be done as in features SPContext is not used rather we use properties object hence i had to eliminate SPContext instead used the web object came from properties. Thanks once again. – Sree Kuttan Jul 25 '12 at 10:35

Checking if a list exists before adding a new one using feature?

1 Answers1