MongoDB query operation returns the specified field (C # official driver)

First, the query method that returns the specified field in MongoDB is as follows:

Db.person.find ({Name: "Clown"},{age:1,sex:1})

This statement indicates that all data in the person table named Clown is queried, but only the age column and the sex column are returned. (The _id column is returned by default, set to 0 to not return)

To manipulate MongoDB in C #, the code is as follows:

           New fieldsdocument ();           Fd. ADD ("Age",1);           Fd. ADD ("Sex",1// returns only name and Sex columns                        return collection.find (query). SetSortOrder (s). Setfields (FD). AsQueryable (); // Query is one of my criteria, which can be ignored first

Query is a querydocument, which is the {Name: "Clown"},fd in the example above is the column we are going to return.

MongoDB query operation returns the specified field (C # official driver)