Socket.ReceiveMessageFrom seems is not implement in Xamarin.Android

[KevinZonda]

Xamarin.Android:

It is an almost empty method in Mono, totally different from .NET framework one:

So, what I recommend is removeing at least Xamarin.Android from the Apply list. Or mention it hasn't been implemented in Xamarin.Android (I guess the whole Mono hasn't done it, but not sure)

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[antonfirsov]

@akoeplinger (sorry in advance that I'm missing couple of key points here):
do you know where does this code live? Shouldn't it be a PNSE instead? Is there any initiative to document which types/methods are unsupported on Xamarin?

/cc @gewarren for the last question.

[KevinZonda]

@akoeplinger (sorry in advance that I'm missing couple of key points here):
do you know where does this code live? Shouldn't it be a PNSE instead? Is there any initiative to document which types/methods are unsupported on Xamarin?

/cc @gewarren for the last question.

Thanks for your reply. But i think the first question's answer will be no, it's not a PNSE. Tracetrack from my Xamarin.Android project:

[0:] System.NotImplementedException: The method or operation is not implemented.
  at System.Net.Sockets.Socket.ReceiveMessageFrom (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags& socketFlags, System.Net.EndPoint& remoteEP, System.Net.Sockets.IPPacketInformation& ipPacketInformation) [0x00026] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net.Sockets/Socket.cs:1911 
  at STUN.Utils.NetUtils+<>c__DisplayClass2_0.<ReceiveMessageFromAsync>b__0 () [0x00002] in C:\Users\Kevin\Desktop\NatTypeTester\STUN\Utils\NetUtils.cs:67 
--- End of stack trace from previous location where exception was thrown ---

  at STUN.Utils.NetUtils.ReceiveMessageFromAsync (System.Net.Sockets.Socket client, System.Net.EndPoint receive, System.Byte[] array, System.Net.Sockets.SocketFlags flag) [0x000a0] in C:\Users\Kevin\Desktop\NatTypeTester\STUN\Utils\NetUtils.cs:80 
  at STUN.Proxy.NoneUdpProxy.ReceiveAsync (System.Byte[] bytes, System.Net.IPEndPoint remote, System.Net.EndPoint receive, System.Threading.CancellationToken token) [0x0011d] in C:\Users\Kevin\Desktop\NatTypeTester\STUN\Proxy\NoneUdpProxy.cs:49 
  at STUN.Client.StunClient3489.TestAsync (STUN.Message.StunMessage5389 sendMessage, System.Net.IPEndPoint remote, System.Net.IPEndPoint receive, System.Threading.CancellationToken token) [0x00066] in C:\Users\Kevin\Desktop\NatTypeTester\STUN\Client\StunClient3489.cs:204 
[Dialog] mIsSamsungBasicInteraction = false, isMetaDataInActivity = false

STUN is a .NET Standard library 2.0, you can access at here: https://github.com/HMBSbige/NatTypeTester/

I use this library in a Xamarin.Android project. The exception is throw at L67, which is:

var length = client.ReceiveMessageFrom(array, 0, array.Length, ref flag, ref receive, out var ipPacketInformation);

[antonfirsov]

@KevinZonda my questions were addressed to @akoeplinger who is area-owner for Xamarin-related stuff.

[gewarren]

Is there any initiative to document which types/methods are unsupported on Xamarin?

@antonfirsov Not that I know of. We have this page that lists APIs that throw PNSE on various platforms that we could add to. Also, if the API is decorated with SupportedOSPlatformAttribute then that would info show up in the syntax/definition code box. cc @davidbritch