c# - How to swap the data source associated with a Linq query?

Question

I have read in other answers how the paramters of a linq query can be changed at runtime. But is it possible to change the data source that the query browses through after the query has been created? Can perhaps the query be given an empty wrapper in which data sources can be plugged in and out, unbeknownst to the query?

For example, let's assume this situation:

// d1 is a dictionary
var keys =  from entry in d1
            where entry.Value < 5
            select entry.Key;

Now, let's assume rather than modifying d1 I want myQuery to stay the same, except I'd like it to process an entirely new dictionary, d2.

The reason for this is that I'd like to decouple who provides the query from who provides the data source. I.e. think the dictionaries as metadata associated with services and the query as the mean for the consumers of services to discover which set of services match their criteria. I need to apply the same query to the metadata of each service.

I guess one parallel that I'm (maybe erroneously) making is with Regular Expression: one can compile a regular expression and then apply it to any string. I'd like to do the same with queries and dictionaries.