abp/test/Volo.Abp.EventBus.Tests/Volo/Abp/EventBus/MySimpleAsyncEventDataHandler.cs

using System.Threading.Tasks;
using Volo.Abp.DependencyInjection;

namespace Volo.Abp.EventBus
{
    public class MySimpleAsyncEventDataHandler : IAsyncEventHandler<MySimpleEventData>, ISingletonDependency
    {
        public int TotalData { get; private set; }

        public Task HandleEventAsync(MySimpleEventData eventData)
        {
            TotalData += eventData.Value;
            return Task.CompletedTask;
        }
    }
}