SPSiteDataQuery for Task List not working

Question

I am creating a visual web part for aggregating all task in all webs of a site collection

I am using SPSiteDataQuery to get all tasks but it does not work for Task list

i.e.

Task List

query.Lists = "<Lists ServerTemplate=\"107\" />";

---

But it work for custom list

Custom List

query.Lists = "<Lists ServerTemplate=\"100\" />";

Can anyone tell me why this does not work for task lists?

Answer 1

There are 3 List Templates for Tasks:

• Project (Gantt) Tasks (TemplateId: 150)
• Tasks (2010) (TemplateId:107)
• Tasks (TemplateId: 171)

Did you verify that the requested List is using the Template you ask for?