编写CAML查询以查询带有托管元数据列的SPList

Question

I have an SPList with a managed metadata column and here is my caml query.

/// This caml query doesn't work
SPQuery oQuery = new SPQuery();
string strQuery = @"<Query><Where><In><FieldRef LookupId=""TRUE"" Name=""TaxonomyColumn"" /><Values><Value Type=""Text"">7392ec1d-3f35-4c5b-b6ad-f80ff15ed718</Value></Values></In></Where></Query>";
oQuery.Query = strQuery;


/// This linq query works exactly fine
var itms = (from SPListItem itm in oList.Items
        where itm["TaxonomyColumn"].ToString().Contains("7392ec1d-3f35-4c5b-b6ad-f80ff15ed718")
        select itm).ToList();

My problem is I need to use CAML Query for some reason and I can't just figure out a way on how to compose my CAML Query to work on querying a list where the column is a managed metadata column.

Please help me. Thanks.

Answer 1

SPQuery adds the Query tag itself:

 SPQuery oQuery = new SPQuery();
string strQuery = @"<Query><Where><Contains><FieldRef Name='TaxonomyColumn' /><Value Type='Text'>7392ec1d-3f35-4c5b-b6ad-f80ff15ed718</Value></Contains></Where></Query>";
oQuery.Query = strQuery;

Answer 2

You don't use the GUID, you need to use the lookup the id. You find this id using TaxonomyField.GetWssIdsOfKeywordTerm(), and write CAML like this:

<Query>
  <Where>
    <In>
      <FieldRef LookupId="TRUE" Name="ItemType" />
      <Values>
        <Value Type="Integer">14</Value>
        <Value Type="Integer">15</Value>
      </Values>
    </In>
  </Where>
</Query>

"In" is a convenience when there are multiple values instead of multiple Eq/Or statements.

Explained in detail here: http://msdn.microsoft.com/en-us/library/ff625182.aspx