创建C＃Windows后台应用程序服务

Question

I wonder how I can "set the background task to AppService".

I tried to create a Windows 10 application for Cortana and I follow these steps: https://msdn.microsoft.com/en-us/library/dn974228.aspx

I somehow can't figure out what I need to do here, because I don't have the appxmanifest file:

In Visual Studio, open your app and declare the background task as an AppService in the app manifest.

I know that sounds weird, but I could really not seek out. Thanks for help.

Answer 1

1. Double click Package.appxmanifest
2. -> Declarations
3. Select Background Tasks
4. Click Add
5. Click the More Info link for more information

Answer 2

From your screenshot, it looks like you skipped a step, and only created a solution with a Runtime Component project in it, but the background task is intended to be added to an existing universal windows app.

If you're looking to create an app that also implements a background task that can run inside Cortana, you'll want to do the following:

1. Create a new blank app of the Universal Windows type ( eg, c# -> Windows -> Universal -> Blank app from the new project window).
2. Inside that solution, go to file -> New -> Project and create a new Windows Runtime Component (you've already performed that step above)
3. From the blank app project, you'll install your Voice Command Definition (VCD) file (as per the documentation linked in your question), update the package manifest, etc.
4. From the Windows Runtime Component project, you'll implement the code that will run in Cortana's background task when invoked by a voice command.
5. From the blank app project, add a reference to the runtime component to ensure that both projects are deployed when you run the app from VS/install it.

I'll agree that the steps in the documentation aren't completely clear, they mention it as a prerequisite but it's not explicit enough. I'll pass that along to the MSDN documentation team. The reason you need two separate projects (for C# and C++/CX projects anyway) is because you'll still need an existing app to install the VCD file into Cortana, and it can be launched by Cortana depending on some of the outcomes of the background task.

The documentation that the MSDN article you link is based on the sample code here: Cortana Voice Command in Microsoft's sample github repository which should help demonstrate how to connect the projects together.