UWP- Desktop extension using App service connection was failed or throw null exception

Question

Hi guys,

I have created a packaging application that contains a UWP app(Main app) and a WPF app. In that, I had explored the app service connection between UWP and WPF for passing arguments from those ones.

So I had followed the steps which are mentioned on the below page.

uwp-with-desktop-extension-part-3

I had established a connection, but it returns the status as a failure or sometimes the connection was closed(Null Exception). I didn't know what mistakes I had done. Anyone can help me with this?

TIA

Github URL : WorksManager

Answer 1

Hi,

Welcome to Microsoft Q&A!

If you use uwp api in wpf app, please add Microsoft.Windows.SDK.Contracts NuGet package instead of Windows.Foundation.FoundationContract and Windows.Foundation.UniversalApiContract .

Besides, you need to add await keyboard for all async methods, such as await args.Request.SendResponseAsync(response). At the same time, please change AppServiceConnectionStatus status = connection.OpenAsync().GetResults() to AppServiceConnectionStatus status = await connection.OpenAsync(). After I modify these as the above, your sample runs well.

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