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Using GridFS in MongoDb from C#

| Wednesday, April 17, 2013
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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