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LINQ to EDGAR Online 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 EDGAR Online Data Provider.

This article demonstrates how to use LINQ to access EDGAR Online tables through the CData ADO.NET Data Provider for EDGAR Online. 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 EDGAR Online Data Source".
  4. Enter your data source connection information.

    1. Navigate to https://developer.edgar-online.com/ and create an account.
    2. Register a new application and retrieve the AppKey. You should select one of the available Web APIs this application will use like HackPack, Insider Trades or Institutional Ownership.
      Note: HackPack is the most important Web API that an application can use since it supports a large number of endpoints. If you are getting the "Access Denied" error you must create a new app and select the correct Web API which supports the resource you are querying.
    3. After successfully creating a new app, you can access your keys through your "my account" area. Set the AppKey connection property value equal to the Key of your application.

    Below is a typical connection string:

    AppKey=20dd8ce9904d422ed89ebde1ad40d
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting EdgarOnlineEntities 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:

EdgarOnlineEntities context = new EdgarOnlineEntities(); var subscriptionsQuery = from subscriptions in context.Subscriptions select subscriptions; foreach (var result in subscriptionsQuery) { 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.