DFrame_2.cs

public class GrpcTest : Workload
{
    GrpcChannel? channel;
    Greeter.GreeterClient? client;

    public override async Task SetupAsync(WorkloadContext context)
    {
        channel = GrpcChannel.ForAddress("http://localhost:5027");
        client = new Greeter.GreeterClient(channel);
    }

    public override async Task ExecuteAsync(WorkloadContext context)
    {
        await client!.SayHelloAsync(new HelloRequest(), cancellationToken: context.CancellationToken);
    }

    public override async Task TeardownAsync(WorkloadContext context)
    {
        if (channel != null)
        {
            await channel.ShutdownAsync();
            channel.Dispose();
        }
    }
}