MongoDB .NET driver and text search

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I am using this MongoDB driver: and I would like to search using a text index, which (I think) is created on all text fields like so:

    "_fts" : "text",
    "_ftsx" : 1

I am using linq queries to filter the data, example:

MongoClient client = new MongoClient(_mongoConnectionString);
IMongoDatabase mongoDatabase = client.GetDatabase(DatabaseName);
var aCollection = mongoDatabase.GetCollection<MyTypeSerializable>(CollectionName);

IMongoQueryable<MyTypeSerializable> queryable = aCollection.AsQueryable()
                .Where(e=> e.Field == 1);
var result = queryable.ToList();

How do I utilize the text search using this method?

Query.Text Method (String, String), Generate a text search query that tests whether the given search string is present MongoDB .NET Driver API Documentation � Namespaces � MongoDB.Driver. Driver.Legacy (in MongoDB.Driver.Legacy.dll) Version: 2.7.3+Branch.v2.7.x. MongoDB provides text indexes to support text search queries on string content. text indexes can include any field whose value is a string or an array of string elements. To perform text search queries, you must have a text index on your collection. A collection can only have one text search index, but that index can cover multiple fields.

Searching for solution I found FilterDefinition<T>.Inject() extension method. So we can go deeper and create one more extension on IMongoQueryable<T>:

public static class MongoQueryableFullTextExtensions
    public static IMongoQueryable<T> WhereText<T>(this IMongoQueryable<T> query, string search)
        var filter = Builders<T>.Filter.Text(search);
        return query.Where(_ => filter.Inject());

And use it like this:

IMongoDatabase database = GetMyDatabase();

var results = database

Hope this helps somebody :)

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How about:

IMongoQueryable<MyTypeSerializable> queryable = aCollection
.Where(e=> e.Field.Contains("term"));

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  • Looks legit, I'll check it out and come back, thank you.
  • Could you also tell me how to combine this approach with linq-based filters? Can I do cursor.ToEnumerable().Where(e => e.Field == 1) and it will actually get "materialized" after a .ToList() at the end?
  • Not sure you can mix and match Linq with Mongo Filters, try: var builder = Builders<MyModel>.Filter; var filter = builder.And( builder.Text("search"), builder.Eq(x => x.Field, 1) );
  • This is exactly what I needed! The same method (using a builder then injecting into a where call) also allows you constructing any other query like geo-spatial queries etc.
  • Are you sure this utilizes the text index?
  • It depends on 2 factors: implementation of Linq provider and query processor on mongodb side. In order to be sure you have to trace this chain.
  • Looking though the source code the above doesn't utilise the text query within mongodb.