quickstarts/workflows/csharp/sdk/order-processor/Activities/NotifyActivity.cs

namespace WorkflowConsoleApp.Activities
{
    using System.Threading.Tasks;
    using Dapr.Workflow;
    using Microsoft.Extensions.Logging;

    record Notification(string Message);

    class NotifyActivity : WorkflowActivity<Notification, object>
    {
        readonly ILogger logger;

        public NotifyActivity(ILoggerFactory loggerFactory)
        {
            this.logger = loggerFactory.CreateLogger<NotifyActivity>();
        }

        public override Task<object> RunAsync(WorkflowActivityContext context, Notification notification)
        {
            this.logger.LogInformation(notification.Message);

            return Task.FromResult<object>(null);
        }
    }
}