C＃mongodb其中OR列表<string>

Question

My document has a property that is of the type List<string> . I want to return all documents from a collection where a set of strings match any item from this List<string> property.

I would like to construct this like the following question, but in C#:

MongoDB find where key equals string from array

I know this is off, but it's my best attempt:

var queryItems = new List<QueryComplete>();
queryItems.Add(Query.EQ("PropertyName", "test"));
var query= Query.Or(queryItems.ToArray());
var qd = new QueryDocument(new BsonDocument { query.ToBsonDocument() });
var result = GetCollection<CollectionName>().FindAs<Type>(qd)

Answer 1

Looks like what you are looking for is described here:

ContainsAny

This method is used to test whether an array (or array-like) field or property contains any of the provided values.

var query =
    from c in collection.AsQueryable<C>()
    where c.A.ContainsAny(new[] { 1, 2, 3 })
    select c;
// or
var query =
    collection.AsQueryable<C>()
    .Where(c => c.A.ContainsAny(new[] { 1, 2, 3 }));

Answer 2

If for some reason you prefer not to use LINQ, you can use the query builder to write it like this:

var setOfStrings = new BsonValue[] { "a", "b", "c" };
var query = Query.Or(
    Query.EQ("PropertyName", "test"),
    Query.In("List", setOfStrings)
);
var cursor = collection.FindAs<C>(query);

If you want to double check what the native MongoDB query looks like you can use:

var json = query.ToJson();

which in this case shows that the equivalent MongoDB query is:

{ "$or" : [
    { "PropertyName" : "test" },
    { "List" : { "$in" : ["a", "b", "c"] } }
] }

If this is not the native MongoDB query you were looking for let me know.

ps There is a new query builder in version 1.5 and QueryComplete is now obsolete.