Question

            string query1 = String.Format("\"query1\":\"SELECT pid, object_id, src_big, owner FROM photo where object_id={0}\"", photoFbId);
            string query2 = String.Format("\"query2\":\"SELECT first_name, last_name FROM user where uid in (select owner from #query1)\""); 

            var client = new FacebookClient(accessToken);
            dynamic imageArray = client.Query(query1,query2);

gives (100) queries parameter: array expected. in line dynamic imageArray = client.Query(query1,query2);
What have I done wrong? The Query method accepts params string so it should be fine..

Answer 1

If you pass more then one parameter to the Query method, it will automatically use the multi-query instead of single query.

The Facebook C# SDK automatically adds the query1 and query2. you only need to enter the query.

var fb = new FacebookClient("access_token");
dynamic result = fb.Query(
    string.Format("SELECT pid, object_id, src_big, owner FROM photo where object_id={0}", photoFbId),
    "SELECT first_name, last_name FROM user where uid in (select owner from #query1)");

You can then access the values of the fql by.

var result0 = result[0].fql_result_set;
var result1 = result[1].fql_result_set;

You can learn more about making requests using Facebook C# SDK at http://blog.prabir.me/post/Facebook-CSharp-SDK-Making-Requests.aspx