Using GridFS in MongoDb from C#

GridFS is a specification for storing large files in MongoDB. GridFS will chunk a file into documents, and the official C# driver supports GridFS.

The following class wraps some of the driver classes (MongoDatabase and MongoGridFS):

public class MongoGridFs

{

    private readonly MongoDatabase _db;

    private readonly MongoGridFS _gridFs;

 

    public MongoGridFs(MongoDatabase db)

    {

        _db = db;

        _gridFs = _db.GridFS;

    }

 

    public ObjectId AddFile(Stream fileStream, string fileName)

    {

        var fileInfo = _gridFs.Upload(fileStream, fileName);

        return (ObjectId)fileInfo.Id;

    }

 

    public Stream GetFile(ObjectId id)

    {

        var file = _gridFs.FindOneById(id);

        return file.OpenRead();           

    }

}

The following code uses the above class to put a file into MongoDB, then read it back out.

var fileName = "clip_image071.jpg";

 

var client = new MongoClient();

var server = client.GetServer();

var database = server.GetDatabase("testdb");

var gridFs = new MongoGridFs(database);

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