Fail to new an instance of gRPC.Core.Channel when code run in Partial Trust

[etha...@infor.com]

I am trying to use Grpc.Core.Channel call gRPC service. When code run in Partial Trust environment, an error below would pop up.

"Inheritance security rules violated by Type:'Grpc.Core.internal.SafeHandleZeroIsInvalid' Derived types must either match the security accessibility of the base type or be less accessible"

How can I use Channel to call Grpc service on a partial trust environment? if can't, is there another way to call Grpc Service?

Look into gRPC code, a .net class SafeHandle is inherited by SafeHandleZeroIsInvalid. As official document described, for partially trusted code, it’s not allowed. InheritanceDemand of SafeHandle is: "for full trust for inheritors. This member cannot be inherited by partially trusted code." https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.safehandle?view=netframework-4.8

I had a try to create my own class which inherited from SafeHandle. And, I tryed to new an instance of this class. When code run in Partial Trust, the same error pop up. What I am thinking the SafeHandle is the root reason cause this problem.

//the code is super simple, I just try to create a channel on a constructor. public class WriterClient { private Channel _channel; private LoggingCenter _logger; public WriterClient(int port, ILogging logger) { _logger = logger == null? new LoggingCenter(new NullLogger()): new LoggingCenter(logger); //when run in Partial Trust, the code below will throw an exception. _channel = new Channel("127.0.0.1", port, ChannelCredentials.Insecure); }

What I am wanted is to call Grpc service correctly in Partial Trust. Any workaround for it?

[Jan Tattermusch]

Responded here:

https://github.com/grpc/grpc/issues/20346

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Jan