please provide public intefaces for Windows.ApplicationModel.AppService.* classes

[juwens]

Proposal: provide public intefaces for Windows.ApplicationModel.AppService.* classes like AppServiceConnection, AppServiceDeferral, etc.

Alternative: let us create instances of AppServiceConnection, AppServiceDeferral and the related classes, which is not possible at the moment

Summary

i developed a small Facade in C# arround the AppServiceConnection which makes it easier to do RPC like messaging across the AppServiceConnection.

Currently you cannot inject an interface of AppServiceConnection, because the available ones are internal and there are no public intefaces available.

im talking about this class:

namespace Windows.ApplicationModel.AppService
{
    //
    // Summary:
    //     Represents a connection to the endpoint for an app service. App services enable
    //     app-to-app communication by allowing you to provide services from your Universal
    //     Windows app to other Universal Windows app.
    [ComImport]
    [ContractVersion(typeof(UniversalApiContract), 65536u)]
    [Activatable(65536u, "Windows.Foundation.UniversalApiContract")]
    [DualApiPartition(version = 1u)]
    [Static(typeof(IAppServiceConnectionStatics), 524288u, "Windows.Foundation.UniversalApiContract")]
    [Threading(ThreadingModel.Both)]
    [MarshalingBehavior(MarshalingType.Agile)]
    public sealed class AppServiceConnection : IAppServiceConnection, IAppServiceConnection2, IDisposable

Also to the alternative, it's not possible to instantiate an AppServiceDeferral.

new AppServiceDeferral() gives CS1729 'AppServiceDeferral' does not contain a constructor that takes 0 arguments `

Rationale

• helps people write and test their code involving the AppServiceConnection Message-API
• reduction of people reimplementing wrappers around the classes for testing ex: https://github.com/felixse/FluentTerminal/blob/e7df4a0743398791239cf5399c98e5628fc823c8/FluentTerminal.App.Services/IAppServiceConnection.cs https://github.com/felixse/FluentTerminal/blob/master/FluentTerminal.App/Adapters/AppServiceConnectionAdapter.cs

Scope

Capability	Priority
This proposal will allow developers to accomplish: automated tests without creating their own wrappers and interfaces around AppServiceConnection	Must

[btueffers]

@juwens we appreciate the request. We don't have any plans, but we will take it into consideration for the future.