FindAll in MongoDB .NET Driver 2.0

Question

I want to query my MongoDB collection without any filter with MongoDB .NET Driver 2.0 but I didn't find a way. I have the following workaround but it looks weird :D

var filter = Builders<FooBar>.Filter.Exists(x => x.Id);
var fooBars = await _fooBarCollection.Find(filter)
    .Skip(0)
    .Limit(100)
    .ToListAsync();

Is there a way to issue queries without a filter in MongoDB .NET Driver 2.0?

Answer 1

You can't use Find without a filter.

You can however use a filter that passes everything:

var findFluent = await _fooBarCollection.Find(_ => true);

Or you can use an empty document which is equivalent:

var findFluent = await _fooBarCollection.Find(new BsonDocument());

They have also added an empty filter but it will only be available in newer versions of the driver:

var findFluent = await _fooBarCollection.Find(Builders<FooBar>.Filter.Empty);

Answer 2

FindAll() is the part of MongoDB 1x series driver. to get the same functionality in 2x series driver use find() with empty BSON Document.

var list = await collection.Find(new BsonDocument()).ToListAsync();
foreach (var dox in list)
{
    Console.WriteLine(dox);
}

Reference

Answer 3

It works for me

public class TestProductContext
{
    MongoClient _client;
    IMongoDatabase _db;

    public TestProductContext()
    {
        _client = new MongoClient("mongodb://localhost:27017");
        _db = _client.GetDatabase("EmployeeDB");

    }

    public IMongoCollection<Product> Products => _db.GetCollection<Product>("Products");
}

public class DataAccess
{
    private TestProductContext _testProductContext;

    public DataAccess(TestProductContext testProductContext)
    {
        _testProductContext = testProductContext;
    }
    public List<Product> GetProducts()
    {
        List<Product> pto = new List<Product>();
        var cursor = _testProductContext.Products.Find(new BsonDocument()).ToCursor();
        foreach (var document in cursor.ToEnumerable())
        {
            pto.Add(document);
        }
    }
}

Answer 4

To match all elements, you could use the FilterDefinitionBuilder.Empty property. I use this property when a user is given the option to query the entire collection, or filter by a single property.

If you're only looking to query the entire collection, without the possibility of a filter, then this isn't necessary.

var builder = Builders<Object>.Filter;
                 matchFilter;
                
FilterDefinition<Object> matchFilter = builder.Empty;
   
var results = await collection.Aggregate()
                              .Match(filter)
                              .ToListAsync()