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LINQ to Open Exchange Rates Data

LINQ provides general-purpose query facilities in .NET Framework 3.0 and above and provides one easy way to programmatically access data through from CData ADO.NET Data Providers. This example uses LINQ to access information from the Open Exchange Rates Data Provider.

This article demonstrates how to use LINQ to access Open Exchange Rates tables through the CData ADO.NET Data Provider for Open Exchange Rates. To do this you will LINQ to Entity Framework, which is used to generate the connection and can be used with any CData ADO.NET Data Providers to access data via 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 Open Exchange Rates Data Source".
  4. Enter your data source connection information.

    The Open Exchange Rates API supports basic authentication with an App Id. After you register, your App Id is displayed in your account dashboard. Set this to the AppId connection property.

    Below is a typical connection string:

    AppId=abc1234;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting OpenExchangeRatesEntities 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:

OpenExchangeRatesEntities context = new OpenExchangeRatesEntities(); var projectsQuery = from projects in context.Projects select projects; foreach (var result in projectsQuery) { Console.WriteLine("{0} {1} ", result.Id, result.Id); }

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