OData $filter with items in a $expand

Question

I have given some web services to access informations.

The first thing that i have tries to expand a node . And i have done that successfully with following code

Answer 1

In OData the Filter command only works on the top level element. For your filter to work you would need to have the following URL

http://www.example.com/ODataService/WorkService.svc/CaseStudies(x)/ServiceOfferings?format=json&$filter=ServiceOfferingID eq 127

Obviously this isn't the query you are trying to write, but behind the scenes your query is being converted to an expression tree which has a root expression based on the top level element.

If you really required to filter the data you could potentially intercept the query and write your own expression as below:

[QueryInterceptor("CaseStudies")]
public Expression> CaseStudieFilter()
{
    
}