从事件中返回一个值——对此有好的做法吗? [英] Return a value from an Event -- is there a Good Practice for this?

问题描述

我正在做一个使用异步 TCP 套接字的小型多线程应用程序，但我将切入正题:我正在使用自定义事件从表单中读取值，并且该事件使用的委托返回一个完成后的字符串.

I'm doing a small multi-threaded app that uses asynchronous TCP sockets, but I will get to the point: I'm using a custom event to read a value from a form and the delegate used by the event returns a string when finished.

我的问题是:这是正确的吗?可以从事件返回值吗?或者有更好的方法来做到这一点?(比如使用一个简单的委托给表单来读取值)

My question here is: is that correct? is it OK to return values from the events? or is there a better way to do this? (like using a simple delegate to the form to read the values)

推荐答案

从事件返回值通常很尴尬.在实践中，我发现在传递给事件的一组自定义 EventArgs 上包含可写属性要容易得多，然后在事件触发后进行检查 - 类似于 WinForms FormClosing 事件的 Cancel 属性.

It's often awkward to return values from events. In practice, I've found it much easier to include a writable property on a set of custom EventArgs that is passed to the event, and then checked after the event fires -- similar to Cancel property of the WinForms FormClosing event.

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