c# - 如何在 TPL 数据流中分支逻辑？

Question

我是 TPL 数据流的新手，如果这是一个简单的问题，请原谅我。

我有一个采用基类的输入缓冲 block 。我如何从那里分支到基于派生类型的 block ？例如:

var inputBlock = new BufferBlock<EventBase>();
//if EventBase is Meeting then go to block X
//if EventBase is Appointment the go to block Y

谢谢!

Answer 1

您可以将谓词发送到 LinkTo 方法以区分项目。但是，您需要从每个 block 内的 EventBase 向下转换以使用特定于该类型的逻辑:

var inputBlock = new BufferBlock<EventBase>();
var meetingBlock = new ActionBlock<EventBase>(
    eventBase =>
    {
        var meeting = eventBase as Meeting;
        //...
    });
var appointmentBlock = new ActionBlock<EventBase>(
    eventBase =>
    {
        var appointment = eventBase as Appointment;
        //...
    });

inputBlock.LinkTo(meetingBlock, eventBase => eventBase is Meeting);
inputBlock.LinkTo(appointmentBlock, eventBase => eventBase is Appointment);

但正如 Servy 指出的那样，您应该避免这种情况，并设计您的类型以支持多态性。