void IEventHandler <TransferOutRequested> .Handle(TransferOutRequested evnt)
{
//响应“转出的命令请求已发起”这个事件，发送“转出”命令
_commandService.Send(new TransferOut(evnt.ProcessId)
{
TransferInfo = evnt.TransferInfo
}, result =>
{
//这里是command的异步回调函数，如果有异常，则发送“处理转出失败”的命令
if (result.ErrorInfo != null)
{
_commandService.Send(new HandleFailedTransferOut(evnt.ProcessId)
{
TransferInfo = evnt.TransferInfo, ErrorInfo = result.ErrorInfo
});
}
});
}
void IEventHandler <TransferOutRequested> .Handle(TransferOutRequested evnt)
{
State = TransferProcessState.TransferOutRequested;
}