Provide OData Services of Trello Data from a WCF Application

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Trello ADO.NET Provider

Trello のLists、Cards、Boards データに連携する.NET アプリケーションを素早く、簡単に開発できる便利なドライバー。



This article shows how to publish an OData feed of Trello data by creating a WCF Service Application.

The CData ADO.NET Provider for Trello enables you to use the Windows Communication Foundation (WCF) framework to rapidly develop service-oriented applications that provide Trello data to OData consumers. This article shows how to create an entity data model to provide the underlying connectivity to the Trello data, as well as how to create a WCF Data Service to expose the OData service. You can then consume the feed with any OData client, for example, Power Pivot or an application that uses the CData ADO.NET Provider for OData.

Create the OData Service

Follow the steps below to create a WCF service application that will provide connectivity to Trello data via OData.

  1. Open Visual Studio and create a new project. Select the WCF Service Application template.
  2. Delete the autogenerated IService.cs and Service1.svc.
  3. Click Project -> Add New Item -> ADO.NET Entity Data Model.
  4. In the Entity Data Model wizard that is displayed, select the 'EF Designer from Database' option.
  5. In the resulting Choose Your Connection dialog, click New Connection.
  6. In the Connection properties dialog, select the CData Trello Data Source and enter the necessary credentials. A typical connection string is below:

    APIKey=myApiKey;Token=myGeneratedToken;

    Trello は、トークンベース認証を使用して、サードパーティアプリケーションにAPI へのアクセスを許可します。ユーザーがアプリケーションにデータへのアクセスを許可すると、アプリケーションにはTrello のAPI へのリクエストに使用できるトークンが付与されます。 Trello のAPI には2通りの方法でアクセスできます。1つ目はTrello 独自の認可ルートで、2つ目はOAuth1.0 を使用する方法です。

    • 認可ルート: 登録の時点で、Trello はAPI キーとトークンをアカウントに割り当てます。認可ルート経由で接続する方法については、ヘルプドキュメントの「認可ルートの使用」を参照してください。
    • OAuth ルート: 認可の使用と同様に、OAuth は、アカウントの作成時にApplication Id とSecret を作成します。接続方法については、ヘルプドキュメントの「OAuth 認証の使用」を参照してください。

    See the help documentation for guides to connecting in Visual Studio.

  7. Select Trello tables and views that you want OData clients to access.
  8. Click Project -> Add New Item -> WCF Data Service.
  9. Specify the data source class and configure access to the new WCF Data Service. In the example below, the Access Rule for the entities is set to All. This means that any user will be able to read and modify data.

    using System; using System.Collections.Generic; using System.Data.Services; using System.Data.Services.Common; using System.Linq; using System.ServiceModel.Web; using System.Web; namespace TrelloService{ public class TrelloDataService : DataService { public static void InitializeService(DataServiceConfiguration config) { config.SetEntitySetAccessRule("*", EntitySetRights.All); config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V3; } } }
  10. Run the project. Applications that support OData can now access the Salesforce data and reflect any changes. You can access the feed in your browser. The feed will resemble the following:

Consume the OData Service from Power Pivot

You can now use the service from any OData client; for example, Excel Power Pivot.

  1. Open Excel and click on the Power Pivot Window button.
  2. A new pop-up will appear. Select the option From Data Feeds.
  3. In the resulting Table Import Wizard, enter the OData URL. For example, http://localhost:12449/TrelloDataService.svc/.
  4. After connecting to the OData service, click the Next button at the bottom of the window.
  5. A table listing of the available tables will appear in the next window of the wizard. Select which tables you want to import and click Finish.
  6. Click Close to import the data in Power Pivot.