MongoDB C# Query for 'Like' on string

问题:

i am using official mongodb c# driver. i want to query mongodb simliar to SQL Like something like db.users.find({name:/Joe/} in c# driver

回答1:

c# query will looks like:

Query.Matches("name", BsonRegularExpression.Create(new Regex("Joe")));

Update:

As per @RoberStam suggestion, there is more simple way to do this:

Query.Matches("name", "Joe") 

回答2:

For the c# driver 2.1 (MongoDB 3.0)

var collection = database.GetCollection<BsonDocument>("<<name of the collection>>");

var filter = Builders<BsonDocument>.Filter.Regex("name", new BsonRegularExpression("Joe"));

var result = await collection.Find(filter).ToListAsync();

For the c# driver 2.2 (MongoDB 3.0)

   var filter = new BsonDocument { { parameterName, new BsonDocument { { "$regex", value }, { "$options", "i"} } } }

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

回答3:

MongoDB C# driver has a BsonRegex type that you can use.

Regex is the closest you will get to the SQL LIKE statement.

Note that prefixed Regexes can use indexes: /^Joe/ will use an index, /Joe/ will not.