Contacts API namespace conflicts on MacCatalyst and iOS

Description

I just upgraded to VS 17.3 P1.1 and the essentials API is complaining that the Contacts type in the Microsoft.Maui.ApplicationModel.Communication namespace is missing. Digging further it seems that there is a conflict with the type because there is a root namespace of Contacts already imported.

Generic code for .NET MAUI that should compile across all platforms won’t compile for iOS or MacCatalyst without #if or always fully qualifying the type.

Steps to Reproduce

Code that contains the following line should work on all platforms. It won’t compile on iOS/MacCatalyst

var contact = await Contacts.Default.PickContactAsync();

Version with bug

Release Candidate 3 (current)

Last version that worked well

Release Candidate 2

Affected platforms

iOS, macOS

Affected platform versions

Unsure

Did you find any workaround?

You have to fully qualify the name:

var contact = await Microsoft.Maui.ApplicationModel.Communication.Contacts.Default.PickContactAsync();

Relevant log output

CS0234	The type or namespace name 'Default' does not exist in the namespace 'Contacts' (are you missing an assembly reference?)	PlatformIntegration (net6.0-ios), PlatformIntegration (net6.0-maccatalyst)	

[adegeo]

@Eilon I’m finding that if iOS or Mac is a target, you must always fully qualify the type, or you can’t compile for all platforms. And these are targeted by default, obviously.

When I ran into this issue, I tried what you suggested, mapping Contacts specifically, this didn’t work though

The only way this works is by mapping the namespace instead:

using Communication = Microsoft.Maui.ApplicationModel.Communication;

...

Communication.Contacts.Default.Get...

[adegeo]

@Eilon it seems to be something with mac/ios directly. There is a root namespace automatically imported when you target that framework. Here is the output of the intellisense and browsing to the code of one of those items:

#region Assembly Microsoft.iOS, Version=15.4.300.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065
// C:\Program Files\dotnet\packs\Microsoft.iOS.Ref\15.4.303\ref\net6.0\Microsoft.iOS.dll
#endregion

using ObjCRuntime;
using System.Runtime.Versioning;

namespace Contacts
{
    [Native]
    [SupportedOSPlatform("ios9.0")]
    [SupportedOSPlatform("macos10.11")]
    [SupportedOSPlatform("maccatalyst9.0.0")]
    public enum CNAuthorizationStatus : long
    {
        NotDetermined = 0,
        Restricted = 1,
        Denied = 2,
        Authorized = 3
    }
}