Developer technologies | .NET | Xamarin
A Microsoft framework for building cross-platform mobile apps using .NET and C# with native performance and user interfaces.
Error: System.InvalidOperationException: You must call Xamarin.Forms.Forms.Init(); prior to using this property
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Pardeep Sharma
21
Reputation points
We are facing an error while performing some action at Xamarin.Forms App:
"Error: System.InvalidOperationException: You must call Xamarin.Forms.Forms.Init(); prior to using this property.\r\n
at Xamarin.Forms.Device.get_PlatformServices()\r\n at Xamarin.Forms.Device.get_RuntimePlatform()\r\n
at Org.Org.ViewModels.VisitorForLogText.Visit(IEvent1 event)\r\n at Org.Org.Domain.Event.<>c.<For>b__25_0(IEventVisitor v, IEvent1 d)\r\n
at Org.Org.Domain.Utils.DefaultEvent`1.Visit(IEventVisitor visitor)\r\n
at Org.Org.CWFParser.models.ECLEvent..ctor(IEvent e) in E:\Org_work\Orgwriter\repo\Org_data_Org_writer\
\Org_data_Org_writer\src\Org.Org.CWFParser\models\ECLEvent.cs:line 24\r\n
at Org.Org.CWFParser.ParserExtensions.<>c.<GetOrgData>b__0_1(IEvent x) in E:\Org_work\Orgwriter\repo\Org_data_Org_writer\
\Org_data_Org_writer\src\Org.Org.CWFParser\ParserExtensions.cs:line 46\r\n
at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()\r\n at System.Collections.Generic.List1..ctor(IEnumerable1 collection)\r\n at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)\r\n
at Org.Org.CWFParser.ParserExtensions.GetOrgData(Stream CWFStream) in E:\Org_work\Orgwriter\repo\
We recently updated our Xamarin.Forms references as:
<ItemGroup>
<Reference Include="FastAndroidCamera, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\FastAndroidCamera.2.0.0\lib\MonoAndroid403\FastAndroidCamera.dll</HintPath>
</Reference>
<Reference Include="Google.Protobuf, Version=3.19.1.0, Culture=neutral, PublicKeyToken=a7d26565bac4d604, processorArchitecture=MSIL">
<HintPath>..\..\packages\Google.Protobuf.3.19.1\lib\netstandard2.0\Google.Protobuf.dll</HintPath>
</Reference>
<Reference Include="Java.Interop" />
<Reference Include="JetBrains.Annotations, Version=2021.3.0.0, Culture=neutral, PublicKeyToken=1010a0d8d6380325, processorArchitecture=MSIL">
<HintPath>..\..\packages\JetBrains.Annotations.2021.3.0\lib\netstandard2.0\JetBrains.Annotations.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AppCenter, Version=0.0.0.0, Culture=neutral, PublicKeyToken=8a600e2fee7ba272, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AppCenter.4.4.0\lib\MonoAndroid50\Microsoft.AppCenter.dll</HintPath>
</Reference>
<Reference Include="Microsoft.AppCenter.Android.Bindings, Version=0.0.0.0, Culture=neutral, PublicKeyToken=8a600e2fee7ba272, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AppCenter.4.4.0\lib\MonoAndroid50\Microsoft.AppCenter.Android.Bindings.dll</HintPath>
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<Reference Include="Microsoft.AppCenter.Crashes, Version=0.0.0.0, Culture=neutral, PublicKeyToken=8a600e2fee7ba272, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AppCenter.Crashes.4.4.0\lib\MonoAndroid50\Microsoft.AppCenter.Crashes.dll</HintPath>
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<Reference Include="Microsoft.AppCenter.Crashes.Android.Bindings, Version=0.0.0.0, Culture=neutral, PublicKeyToken=8a600e2fee7ba272, processorArchitecture=MSIL">
<HintPath>..\..\packages\Microsoft.AppCenter.Crashes.4.4.0\lib\MonoAndroid50\Microsoft.AppCenter.Crashes.Android.Bindings.dll</HintPath>
</Reference>
<Reference Include="Mono.Android" />
<Reference Include="mscorlib" />
<Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
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<Reference Include="ObservableData.Querying, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="ObservableData.Structures, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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</Reference>
<Reference Include="SignaturePad, Version=3.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Controls.SignaturePad.3.0.0\lib\MonoAndroid\SignaturePad.dll</HintPath>
</Reference>
<Reference Include="SignaturePad.Forms, Version=3.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Controls.SignaturePad.Forms.3.0.0\lib\MonoAndroid\SignaturePad.Forms.dll</HintPath>
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<Reference Include="System" />
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<Private>True</Private>
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<Reference Include="System.Core" />
<Reference Include="System.IO.Compression" />
<Reference Include="System.Memory, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
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<Private>True</Private>
</Reference>
<Reference Include="System.Net.Http" />
<Reference Include="System.Numerics" />
<Reference Include="System.Numerics.Vectors" />
<Reference Include="System.Reactive, Version=5.0.0.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
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<Reference Include="System.Reactive.Core, Version=3.0.6000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
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<Reference Include="System.Reactive.Interfaces, Version=3.0.6000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
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<Reference Include="System.Xml.Linq" />
<Reference Include="System.Xml" />
<Reference Include="Xamarin.Android.Arch.Core.Common, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Arch.Core.Common.1.1.1.3\lib\monoandroid90\Xamarin.Android.Arch.Core.Common.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Arch.Core.Runtime, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Arch.Core.Runtime.1.1.1.3\lib\monoandroid90\Xamarin.Android.Arch.Core.Runtime.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Arch.Lifecycle.Common, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Arch.Lifecycle.Common.1.1.1.3\lib\monoandroid90\Xamarin.Android.Arch.Lifecycle.Common.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Arch.Lifecycle.LiveData, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Arch.Lifecycle.LiveData.1.1.1.3\lib\monoandroid90\Xamarin.Android.Arch.Lifecycle.LiveData.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Arch.Lifecycle.LiveData.Core, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Arch.Lifecycle.LiveData.Core.1.1.1.3\lib\monoandroid90\Xamarin.Android.Arch.Lifecycle.LiveData.Core.dll</HintPath>
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<Reference Include="Xamarin.Android.Arch.Lifecycle.Runtime, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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</Reference>
<Reference Include="Xamarin.Android.Arch.Lifecycle.ViewModel, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Arch.Lifecycle.ViewModel.1.1.1.3\lib\monoandroid90\Xamarin.Android.Arch.Lifecycle.ViewModel.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Animated.Vector.Drawable, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Animated.Vector.Drawable.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Annotations, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Annotations.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Annotations.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.AsyncLayoutInflater, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.AsyncLayoutInflater.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.AsyncLayoutInflater.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Collections, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Collections.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Collections.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Compat.27.0.2.1\lib\monoandroid90\Xamarin.Android.Support.Compat.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.CoordinaterLayout, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.CoordinaterLayout.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.CoordinaterLayout.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Core.UI, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Core.UI.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Core.UI.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Core.Utils, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Core.Utils.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Core.Utils.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.CursorAdapter, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.CursorAdapter.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.CursorAdapter.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.CustomTabs, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.CustomTabs.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.CustomTabs.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.CustomView, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.CustomView.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.CustomView.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Design, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Design.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Design.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.DocumentFile, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.DocumentFile.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.DocumentFile.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.DrawerLayout, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.DrawerLayout.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.DrawerLayout.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Fragment, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Fragment.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Fragment.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.Interpolator, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Interpolator.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Interpolator.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.Loader, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Android.Support.LocalBroadcastManager, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Android.Support.Media.Compat, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Media.Compat.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Media.Compat.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.Print, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Android.Support.SlidingPaneLayout, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.SlidingPaneLayout.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.SlidingPaneLayout.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.SwipeRefreshLayout, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.SwipeRefreshLayout.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.SwipeRefreshLayout.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.Transition, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.Transition.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.Transition.dll</HintPath>
</Reference>
<Reference Include="Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.v4.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.v4.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.v7.AppCompat, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.v7.AppCompat.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.v7.AppCompat.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.v7.CardView, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Android.Support.v7.MediaRouter, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.Android.Support.v7.MediaRouter.28.0.0.3\lib\monoandroid90\Xamarin.Android.Support.v7.MediaRouter.dll</HintPath>
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<Reference Include="Xamarin.Android.Support.v7.Palette, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Android.Support.v7.RecyclerView, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.AndroidX.Concurrent.Futures, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.AndroidX.Concurrent.Futures.1.1.0.3\lib\monoandroid90\Xamarin.AndroidX.Concurrent.Futures.dll</HintPath>
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<Reference Include="Xamarin.AndroidX.Interpolator, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\Xamarin.AndroidX.Interpolator.1.0.0.8\lib\monoandroid90\Xamarin.AndroidX.Interpolator.dll</HintPath>
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<Reference Include="Xamarin.AndroidX.MultiDex, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.AndroidX.VersionedParcelable, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Essentials, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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</Reference>
<Reference Include="Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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</Reference>
<Reference Include="Xamarin.Forms.Platform, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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</Reference>
<Reference Include="Xamarin.Forms.Xaml, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="Xamarin.Google.Guava.ListenableFuture, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
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<Reference Include="ZXing.Net.Mobile.Core, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
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</Reference>
<Reference Include="ZXing.Net.Mobile.Forms, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\ZXing.Net.Mobile.Forms.2.4.1\lib\MonoAndroid71\ZXing.Net.Mobile.Forms.dll</HintPath>
</Reference>
<Reference Include="ZXing.Net.Mobile.Forms.Android, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\ZXing.Net.Mobile.Forms.2.4.1\lib\MonoAndroid71\ZXing.Net.Mobile.Forms.Android.dll</HintPath>
</Reference>
<Reference Include="zxing.portable, Version=0.16.2.0, Culture=neutral, PublicKeyToken=830ae994e36ac27d, processorArchitecture=MSIL">
<HintPath>..\..\packages\ZXing.Net.Mobile.2.4.1\lib\MonoAndroid71\zxing.portable.dll</HintPath>
</Reference>
<Reference Include="ZXingNetMobile, Version=2.4.1.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\..\packages\ZXing.Net.Mobile.2.4.1\lib\MonoAndroid71\ZXingNetMobile.dll</HintPath>
</Reference>
<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="2.2.0.3" />
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.V4" Version="1.0.0.5" />
<PackageReference Include="Xamarin.AndroidX.MediaRouter" Version="1.2.0" />
<PackageReference Include="Xamarin.AndroidX.Palette" Version="1.0.0.5" />
</ItemGroup>
We also checked previous similar questions asked (here & here) but none of them are helpful.
The same code is working on the last release. Please suggest if we are missing anything or need to update some components to resolve this issue.
Developer technologies | .NET | Xamarin
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Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,166 Reputation points Microsoft External Staff2022-05-05T02:38:32.457+00:00 Did the error occur in using Dependency Service or Unit testing?
For Dependency Service:
Referring to the official documentation, Xamarin.Forms DependencyService Introduction, we can find this:
DependencyService allows apps to call into platform-specific functionality from shared code. This functionality enables Xamarin.Forms apps to do anything that a native app can do.
The Forms' DependencyService is calling native code, if your Android Service is already running in native code. What ever code your Dependency Service is using for Android, you can use without a Dependency Service.
Therefore, you should make your
Serviceindependent ofXamarin.Forms.For Unit testing:
You could refer to this issue https://github.com/xamarin/XamarinCommunityToolkit/issues/825.
There is the solution for
You must call Xamarin.Forms.Forms.Init(); prior to using this property.in testing. -
Pardeep Sharma 21 Reputation points
2022-05-05T13:49:53.087+00:00 As I checked the codebase, we don't have any platform-specific code that may cause the above issue. Is there any other scenario that causes the above exception?
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Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,166 Reputation points Microsoft External Staff
2022-05-06T02:38:17.17+00:00 Usually, it is caused by the above two reasons.
Have you confirmed that the NuGet packages whether support your android version?
Could please give us more details about the android target API number, and how to reproduce this issue in a new project?
It will be helpful for us to find the real reason.
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Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,166 Reputation points Microsoft External Staff
2022-05-11T06:03:32.467+00:00 I have not heard from you for a couple of days. Please let me know if there is anything that I can help here.
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Pardeep Sharma 21 Reputation points
2022-05-11T14:43:05.127+00:00 As I checked and debug the code, there's a Device type check in the Shared lib that's causing the exception. Thanks a lot for the direction.
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