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up vote 11 down vote favorite

I would like to connect to the database specified in the connection string, without specifying it again in GetDatabase.

For example, if I have a connection string like this;

mongodb://localhost/mydb

I would like to be able to db.GetCollection("mycollection") from mydb.

This would allow the database name to be configured easily in the app.config file.

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3 Answers

up vote 14 down vote accepted

Update:

MongoServer.Create is obsolete now (thanks to @aknuds1). Instead this use following code:

var _server = new MongoClient(connectionString).GetServer();

It's easy. You should first take database name from connection string and then get database by name. Complete example:

var connectionString = "mongodb://localhost:27020/mydb";

//take database name from connection string
var _databaseName = MongoUrl.Create(connectionString).DatabaseName;
var _server = MongoServer.Create(connectionString);

//and then get database by database name:
_server.GetDatabase(_databaseName);
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Ah, ok - I see my problem. I don't have access to the connection string, but only the already-created MongoServer object. And it doesn't appear to know about the connection string-specified database. Thanks. – Pete Montgomery Aug 26 '11 at 9:01
MongoServer.Create is obsolete. – aknuds1 Jan 23 at 12:36
@aknuds1: Thanks, answer is updated. – Andrew Orsich Jan 23 at 14:08
up vote 3 down vote

The answer below is apparently obsolete now, but works with older drivers. See comments.

If you have the connection string you could also use MongoDatabase directly:

var db =  MongoDatabase.Create(connectionString);
var coll = db.GetCollection("MyCollection");
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As time passed, MongoDatabase.Create() has been obsoleted since driver version 1.7 – runTarm Jan 3 at 10:40
@runTarm But time goes on, and the specification of database names in C# mongo connection strings is not getting obsoleted. – nik.shornikov Feb 19 at 21:31
up vote 0 down vote

With version 1.7 of the official 10gen driver, this is the current (non-obsolete) API:

const string uri = "mongodb://localhost/mydb";
var client = new MongoClient(uri);
var db = client.GetServer().GetDatabase(new MongoUrl(uri).DatabaseName);
var collection = db.GetCollection("mycollection");
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