I have a cross-platform Xamarin Forms app. Most of the code (including XAML) is in a shared project. There are three app projects, and three matching solution configurations (Android / iOS / UWP). Same thing happens in all configurations.

All XAML-generated code (InitializeComponent and properties) produces ReSharper warnings, breaks autocompletion, and shows up in red. Despite this, entire solution builds and runs normally.

To reproduce:

1. Clone https://github.com/Esri/arcgis-runtime-samples-dotnet/tree/8e83d15a74ff30c70c7c980bc112002bd251fa58
2. Open solution ~/src/Forms/ArcGISRuntime.Xamarin.Samples.Forms.sln
3. Build solution (or at least restore NuGet packages)
4. Open any code-behind file (*.xaml.cs) from the shared project.

System info:

• Microsoft Visual Studio Professional 2017 v15.6.5
  
• JetBrains ReSharper Ultimate 2018.1 EAP 6 Checked Build 112.0.20180402.185705-eap06
  
• NuGet Package Manager 4.6.0
  
• Visual Studio Tools for Universal Windows Apps 15.0.27428.01
  
• Xamarin 4.9.0.753 (f0f46392f)
  
• Xamarin Designer 4.10.96 (a702a9ceb)
  
• Xamarin.Android SDK 8.2.0.16 (HEAD/a78295902)
  
• Xamarin.iOS and Xamarin.Mac SDK 11.9.1.24 (f62de47)