Problems with PredicateBuilder

I'm having trouble using PredicateBuilder to dynamically add "Or where" clauses to a LINQ statement. I will explain what I am trying to accomplish in the first place.

I have an inverted index that stores keywords from link link headers. I use one, so I can quickly find these links based on these keywords. The inverted index is of type

Dictionary<string, List<VerifiedUrl>>

Thus, each word is associated with a list of URLs containing that word.

The next step I'm in is to make the inverted index searchable. Therefore, when I search for “blue,” I return all links associated with the key “either” or “blue”. After several Google searches, it seemed like the best way to dynamically add "Or where" sentences to a LINQ statement through the PredicateBuilder class . I had problems with the last step when I use the predicate that I created.

var invertedIndex = new Dictionary<string, List<VerifiedUrl>>();

//the invertedIndex is built and filled here. Now I am trying to search through it.

Console.WriteLine("\nEnter words to see if there are matches");
string query = Console.ReadLine();
Console.WriteLine();

string[] words = query.Split(',', ' '); 

//the predicate I'll be building. I'm not positive it is of the correct type. I've assumed that it should be of the same type as the Dictionary type in the inverted index
var predicate = PredicateBuilder.False<KeyValuePair<string, List<VerifiedUrl>>>();

foreach (string w in words)
{
    string temp = w;
    predicate = predicate.Or(p => p.Key == temp);
}
//this is the line that generates the syntax error.
test = invertedIndex.Where(predicate);

I get an error message. Hover over .Where. "Type arguments cannot be taken out of use. Try specifying type arguments exactly."

I tried to change:

var predicate = PredicateBuilder.False<KeyValuePair<string, List<VerifiedUrl>>>();

to

Expression<Func<KeyValuePair<string, List<VerifiedUrl>>, bool>> predicate = PredicateBuilder.False<KeyValuePair<string, List<VerifiedUrl>>>();

but it had no effect. In the error console, I get different errors:

Error   1   Instance argument: cannot convert from 'System.Collections.Generic.Dictionary<string,System.Collections.Generic.List<InvertedIndexConsoleApp.VerifiedUrl>>' to 'System.Linq.IQueryable<System.Collections.Generic.KeyValuePair<string,System.Collections.Generic.List<InvertedIndexConsoleApp.VerifiedUrl>>>'   c:\users\josh\documents\visual studio 2010\Projects\InvertedIndexConsoleApp\InvertedIndexConsoleApp\Program.cs  79  25  InvertedIndexConsoleApp

Error   2   'System.Collections.Generic.Dictionary<string,System.Collections.Generic.List<InvertedIndexConsoleApp.VerifiedUrl>>' does not contain a definition for 'Where' and the best extension method overload 'System.Linq.Queryable.Where<TSource>(System.Linq.IQueryable<TSource>, System.Linq.Expressions.Expression<System.Func<TSource,bool>>)' has some invalid arguments c:\users\josh\documents\visual studio 2010\Projects\InvertedIndexConsoleApp\InvertedIndexConsoleApp\Program.cs  79  25  InvertedIndexConsoleApp