IMongoCollection<Person> collection = database.GetCollection<Person>("Persons");

var filter = Builders<Person>.Filter.Gt(p => p.Age,5);

var filter1 = Builders<Person>.Filter.And(Builders<Person>.Filter.Gt(p => p.Age, 5), Builders<Person>.Filter.Eq(p => p.Id, 1));// And 并且 还有or方法

var filter2 = Builders<Person>.Filter.Where(p => p.Age > 5 && p.Id == 1);//和上面的写法是一样的但是，建议用Where方法

 //普通查询

var result= collection.Find(filter).ToList();

foreach (var item in result)

{

 Console.WriteLine(item.Age + item.Name);