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Working with Cosmos DB Data in LINQPad

Execute LINQ queries to Cosmos DB data in LINQPad.

The CData ADO.NET Provider for Cosmos DB enables you to use standard ADO.NET interfaces like LINQ and the Entity Framework to work with Cosmos DB data. This article shows how to connect from LINQPad and execute LINQ queries.

Create the Data Model

After downloading and installing the provider and LINQPad, create a new class library project in Visual Studio.

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

  1. Right-click your project and click Add -> New Item -> ADO.NET Entity Data Model. In the resulting dialog, select Code First from database. Click New Connection and specify the connection string options in the resulting wizard.

    To obtain the connection string needed to connect to a Cosmos DB account using the MongoDB API, log in to the Azure Portal, select Azure Cosmos DB, and select your account. In the Settings section, click Connection String.

    • Server: Set this to the Host value. You can specify the port here or in Port.
    • Port: Specify the port number.
    • Database: Set this to the database you want to read from and write to.
    • User: Set this to the username to be used to perform MongoDB authentication to the database.
    • Password: Set this to the user's password.

    To access Cosmos DB tables you can use automatic schema discovery or write your own schema definitions. Schemas are defined in .rsd files, which have a simple format that makes them easy to extend. You can also execute free-form queries that are not tied to the schema.

    Below is a typical connection string:

    Server=anhohmongo.documents.azure.com;Port=10255;Database=test;User=contoso123:0Fc3IolnL123;Password=test;
  2. Select the desired tables and views and click Finish to create the data model.

  3. Build the project. The generated files can be used to create the Cosmos DB connection in LINQPad.

Connect to Cosmos DB Data in LINQPad

After you have obtained the required connection properties and created the data model assembly, follow the steps below to start using the data model in LINQPad.

  1. Open LINQPad and click Add Connection.

  2. Select the "Use a typed data context from your own assembly" option.

  3. Select Entity Framework DbContext.

  4. Click Browse next to the Path to Custom Assembly box and browse to your project folder. Browse to the .dll or .exe under the bin folder.

  5. Select the name of the DbContext.
  6. If you saved your connection string in App.Config, specify the path to the App.config.

You can now query Cosmos DB data through LINQPad. For examples of the supported LINQ queries, see the "LINQ and Entity Framework" chapter in the help documentation.