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Rapidly create and deploy powerful .NET applications that integrate with MongoDB document databases.

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LINQ to MongoDB Data


LINQ offers versatile querying capabilities within the .NET Framework (v3.0+), offering a straightforward method for programmatic data access through CData ADO.NET Data Providers. In this article, we demonstrate the use of LINQ to retrieve information from the MongoDB Data Provider.

This article illustrates using LINQ to access tables within the MongoDB via the CData ADO.NET Data Provider for MongoDB. To achieve this, we will use LINQ to Entity Framework, which facilitates the generation of connections and can be seamlessly employed with any CData ADO.NET Data Providers to access data through LINQ.

See the help documentation for a guide to setting up an EF 6 project to use the provider.

  1. In a new project in Visual Studio, right-click on the project and choose to add a new item. Add an ADO.NET Entity Data Model.
  2. Choose EF Designer from Database and click Next.
  3. Add a new Data Connection, and change your data source type to "CData MongoDB Data Source".

  4. Enter your data source connection information.

    Set the Server, Database, User, and Password connection properties to connect to MongoDB. To access MongoDB collections as tables you can use automatic schema discovery or write your own schema definitions. Schemas are defined in .rsd files, which have a simple format. You can also execute free-form queries that are not tied to the schema.

    Below is a typical connection string:

    Server=MyServer;Port=27017;Database=test;User=test;Password=Password;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting MongoDBEntities as our entity connection in App.Config.
  6. Enter a model name and select any tables or views you would like to include in the model.

Using the entity you created, you can now perform select , update, delete, and insert commands. For example:

MongoDBEntities context = new MongoDBEntities(); var restaurantsQuery = from restaurants in context.restaurants select restaurants; foreach (var result in restaurantsQuery) { Console.WriteLine("{0} {1} ", result._id, result.borough); }

See "LINQ and Entity Framework" chapter in the help documentation for example queries of the supported LINQ.