Need Xamarin Client

[MhAllan]

I am having errors (Android crashes) when adding Microsoft.AspNetCore.SignalR.Client reference.
The error is : "Could not load assembly 'System.Memory' during startup registration"

I don't know if monodroid needs to update or your client should be Standard than Core?

[VladimirAkopyan]

Can;t seem to find source for that package on gitub. Am I being dumb? Can someone point me to it?

[MhAllan]

@VladimirAkopyan it is still preview, check the "Include Prerelease" checkbox of your VS NuGet manager

[VladimirAkopyan]

I meant that I could not find the source code of this package on github - I want to take a look at the source. Is it in a folder in this repo?

[nikolayDemirev]

I have the same issue with SignalR on Xamarin.Android:

12-27 19:16:50.510 D/Mono (10799): Assembly Loader probing location: 'System.Memory'.
12-27 19:16:50.510 F/monodroid-assembly(10799): Could not load assembly 'System.Memory' during startup registration.
12-27 19:16:50.510 F/monodroid-assembly(10799): This might be due to an invalid debug installation.
12-27 19:16:50.510 F/monodroid-assembly(10799): A common cause is to 'adb install' the app directly instead of doing from the IDE.

It runs on Xamarin.iOS and Xamarin.UWP, but Xamarin.Android gives that error and the app crashes just after showing the SplashScreen. Even without using any SignalR class.

[VishalMadhvani]

https://github.com/dotnet/corefx/tree/master/src/System.Memory

[nikolayDemirev]

I was able to fix the error related to System.Memory, by installing manually System.Memory 4.4.0-preview2-25405-01 nuget from a local source, because I could not find it in nuget.org source. I have the "Include prerelease" option enabled. After that I got a new error:

12-28 12:44:39.016 F/monodroid-assembly( 6004): Could not load assembly 'System.Runtime.CompilerServices.Unsafe' during startup registration.
12-28 12:44:39.016 F/monodroid-assembly( 6004): This might be due to an invalid debug installation.
12-28 12:44:39.016 F/monodroid-assembly( 6004): A common cause is to 'adb install' the app directly instead of doing from the IDE.

I have tried to install that nuget from a local source the same way as System.Memory but that did not help.

[nikolayDemirev]

I was able to fix the error related to System.Memory, by installing manually System.Memory 4.4.0-preview2-25405-01 nuget from a local source, because I could not find it in nuget.org source. I have the "Include prerelease" option enabled. After that I got a new error:

12-28 12:44:39.016 F/monodroid-assembly( 6004): Could not load assembly 'System.Runtime.CompilerServices.Unsafe' during startup registration.
12-28 12:44:39.016 F/monodroid-assembly( 6004): This might be due to an invalid debug installation.
12-28 12:44:39.016 F/monodroid-assembly( 6004): A common cause is to 'adb install' the app directly instead of doing from the IDE.

I have tried to install that nuget from a local source the same way as System.Memory but that did not help.

I was able to fix this by manually copying the System.Runtime.CompilerServices.Unsafe.dll from the nuget package to obj\Debug\android\assets folder. But this is not very good.

Can anyone help how to make it work without hacks?

[MhAllan]

@nikolayDemirev Thanks a lot, to summarise: what works is copying the "System.Memory" and "System.Runtime.CompilerServices.Unsafe" to" \obj\Debug\android\assets"

[analogrelay]

What version of SignalR are you using? The current version of SignalR may depend on some pre-release bits of the .NET MyGet feeds, so you may need to add those as NuGet sources to get the right packages.

[MhAllan]

@anurse I am using Microsoft.AspNetCore.SignalR version 1.0.0-alpha2-final

[spolezhaev]

@MhAllan So what exactly we should copy? Dll or what? If Dll where do i get it?

[MhAllan]

@Piteryo Yes Dlls. You can get them by Nuget having "Include prerelease" checkbox checked. then you will find them in ".nuget" folder in C:\Users\Your_User

Or these I attached

Signalr-Xam-Droid.zip

[mikaelm12]

Is anyone still seeing this issue with 1.0.0-alpha2-final version of Microsoft.AspNetCore.SignalR.Client ? I was able to install and use it in a Xamarin Android project without any issues.

[ghost]

Yes I have exactly the same issue. This is a blocker for my project right now.

[mikaelm12]

@w2k Are you using 1.0.0-alpha2-final version of the client? What version of the runtime are you using?

[MhAllan]

@mikaelm12 , yes the issue is in 1.0.0-alpha2-final .. please note we are talking about Xamarin Forms solution (I didn't try with Xamarin Android solution). could you upload your android solution so I can see the difference. for me if I don't manually include "System.Memory" and "System.Runtime.CompilerServices.Unsafe" in " \obj\Debug\android\assets" it doesn't work. I came back to it today updated whatever needs to update today and tried again, same issue without that manually copy of dlls

[davidfowl]

@MhAllan are you using the latest Xamarin Android version?

[mikaelm12]

https://github.com/aspnet/SignalR-samples/tree/master/XamarinAndroidChatClient

[MhAllan]

Hi @mikaelm12 , Thanks for the example. The problem is in Xamarin Forms Android, the difference is that your project is using packages.config while Xamarin form is using packagereference. I don't know why this packagereference is skipping dependencies, I guess they are supposed to be in the runtime but monodroid doesn't have them. You just start a xamarin forms solution, add the signalr client to the android and that android won't be able to load the dependencies i mentioned

[davidfowl]

@MhAllan What version of Xamarin Android are you using?

[MhAllan]

@davidfowl , it is Android 8.0, but those Mono.Android dlls are all versioned 0.

[MhAllan]

Here is the solution, connect to android and launch it, it will crash. I am connecting to Android 6 Samsung device

SignalrTest.zip

[nikolayDemirev]

Hi, do we still have to copy the binaries manually in order to make it work?

[MhAllan]

@nikolayDemirev I believe we still have to do so until these binaries are out with .net core 2.1 and get included in mono

[Hazzamanic]

Any news on when we might see support for signalr in android forms projects?

[ConfusedTA]

Experiencing the same issue with a brand new install of Windows, VS Preview, .NET Core, and SignalR - even manually copying the System.Memory and System.Runtime.CompilerServices.Unsafe DLLs into the debug folder prior to build/deployment is failing. The splash screen will appear, then the app will crash. Deployment also takes an excruciatingly long time.

[davidfowl]

Closing see #1886