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C#结构中的事件?(Are Events in C# structs?)

所以我有一个EventHandlers字典,但是我发现,当我将字符串中的keyvaluepair添加到事件中时,一切正常。 但是,如果我添加keyvaluepair,然后更新事件处理程序的值,字典不会更新。

public static event EventHandler TestEvent;
private static Dictionary<int, EventHandler> EventMapping = new Dictionary<int, EventHandler>();

 //TestEvent += GTKWavePipeClient_TestEvent;

  EventMapping.Add(0, TestEvent);
  TestEvent += GTKWavePipeClient_TestEvent;
  //test event is non null now. keyvaluepair in EventMapping has a value of null

So I have a dictionary of EventHandlers, yet I find that when I attach to an event before adding the keyvaluepair to the dictionary, everything works fine. But if I add the keyvaluepair and then update the value of the eventhandler, the dictionary does not update.

public static event EventHandler TestEvent;
private static Dictionary<int, EventHandler> EventMapping = new Dictionary<int, EventHandler>();

 //TestEvent += GTKWavePipeClient_TestEvent;

  EventMapping.Add(0, TestEvent);
  TestEvent += GTKWavePipeClient_TestEvent;
  //test event is non null now. keyvaluepair in EventMapping has a value of null

原文:https://stackoverflow.com/questions/28861375
更新时间:2022-05-05 16:05

最满意答案

使用: return

return render :json => fail_any

或者,在render :json ...之后使用return render :json ...行如:

render :json => fail_any
return

更新:

render :text => "No Data" and return if some_condition

或者,如果您确定要在此时停止控制器的执行,则只需render and return

render :text => "No Data" and return

这可以确保在遇到语句后停止执行,并且在操作代码中不再发生流程,因为它看到了返回。

这篇关于渲染和返回的文章可能会有用。


The problem solved by using threads instead of processes (the default option)

  responses = Parallel.map(urls, :in_threads => 3) do |url|

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