[英]How do I subscribe to and raise an event within the same post method of my controller?
When an instance of my model MyPost
is posted and it has a property with a certain value, eg Type = "Question"
, I want to save the Question
, subscribe to an event NoMoreAnswers
and wait for a NoMoreAnswers
event before returning the HTTP Response which will be a collection of 0
or more MyPost
of Type = "Answer"
. 当发布我的模型
MyPost
的实例并且它具有一个具有特定值的属性时,例如Type = "Question"
,我想保存Question
,订阅事件NoMoreAnswers
并等待NoMoreAnswers
事件,然后返回HTTP响应,将是0
或多个Type = "Answer"
MyPost
的集合。 Each MyPost
will have a unique Id. 每个
MyPost
将具有唯一的ID。
When additional instance of MyPost
come in with a Type of Answer
they also need to be saved. 当
MyPost
其他实例带有“ Answer
类型”时,也需要保存它们。 Each Answer
will also have its own unique id and a RefId
pointing back to one of the Questions. 每个
Answer
还将具有其自己的唯一ID和一个指向问题之一的RefId
。
Finally when an instance of MyPost
of Type = "NoMoreAnswers"
is posted, also with its own unique id and with a RefId
pointing back to one of the Questions, I want to raise the event NoMoreAnswers
. 最后,当发布
Type = "NoMoreAnswers"
的MyPost
实例时,还具有其自己的唯一ID和RefId
指向其中一个问题,我想引发事件NoMoreAnswers
。 Optionally, the MyPost
instance with Type = "NoMoreAnswers"
should also be saved. (可选)还应保存
Type = "NoMoreAnswers"
的MyPost
实例。 This raised event should cause the waiting Question
to collect all the related Answers
and return them as a collection of MyPosts
. 引发的事件应导致等待中的
Question
收集所有相关的Answers
并将它们作为MyPosts
的集合MyPosts
。 This will obviously mean that the eventargs
will need to contain the RefId
of the NoMoreAnswers
post, and every waiting Question
will have to examine the eventargs
to see if the event is relevant to it, and if not go back to a waiting state. 显然,这将意味着
eventargs
将需要包含NoMoreAnswers
帖子的RefId
,并且每个正在等待的Question
将必须检查eventargs
以查看该事件是否与之相关,以及是否不返回到等待状态。
Can someone help me get started? 有人可以帮助我入门吗? How does one define, subscribe to and raise events that are relevant in this situation?
如何定义,订阅和引发与此情况相关的事件? Is there a pattern that applies to this kind of problem that I should read up on?
是否有适用于此类问题的模式值得我继续阅读?
If I right understand you, you need to use Session as a context for keeping and operating intermediate data between requests. 如果我理解正确,则需要使用Session作为上下文来保留和操作请求之间的中间数据。 See HttpContext Session.
请参见HttpContext会话。
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