在winform中的焦点事件期间根据绑定值更新值
我有一个绑定到 LLBLGen 实体的 WinForms 表单（尽管我相信这个问题不是特定于这个绑定源的，我提到它只是为了以防万一）。我的目标似乎很简单：根据其他字段的计算更新表单上的另一个字段。
我的问题是，我想重用表单上其他地方使用的相同业务逻辑来执行此计算，因此我将绑定实体传递到业务逻辑层，以便可以对其进行处理。
我觉得奇怪的是，我在焦点链中找不到位置（请参阅：http://msdn.microsoft.com/en-us/library/system.windows.forms.control.enter.aspx ），我可以在其中使用绑定实体更新表格。计算执行得很好，但使用的是更新前的值。
我过去曾通过从 .text 中获取值、验证它们是否可用并从那里开始解决这个问题。我还使用“更新”按钮解决了这个问题：即使我在编辑值时立即单击，单击事件也可以访问更新的值。
不过，我似乎遗漏了一些明显的东西：事件链中的某个地方应该更新绑定值，并且我应该能够在那里运行我的计算。
我的核心问题：我应该使用什么事件来访问 WinForms 中更新的绑定元素？
I have a WinForms form bound to a LLBLGen entity (although I believe this problem to not be specific to this binding source, I mention it just in case). My goal seems pretty simple: update another field on the form based on a calculation for the other fields.
My problem is that I want to reuse the same business logic that is used elsewhere on the form to do this computation and thus I am passing the bound entity to the business logic layer so it can be processed.
What I find strange is that I can't find a place in the focus chain (see: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.enter.aspx ) where I can use the bound entity in an updated form. The calculation is performed fine, but with the pre-update values.
I have worked around this in the past by grabbing values from .text, validating them as usable and going from there. I have also worked around it with "update" buttons: the click event can access the updated value, even if I was clicking immediately from editing a value.
Still, it seems like I'm missing something obvious: somewhere in the event chain the bound value should be updated and I should be able to run my calculation there.
My core question: what event should I be using to get access to the updated bound element in WinForms?
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考虑到我关心的是获取绑定数据更改，我停止计算 UI 事件并切换到监听相关实体上的 PropertyChanged() 事件。这绕过了问题并且工作得很好......并且可能是我首先应该做的。）
我暂时将其保留为未答复；也许有人仍然对焦点事件链的基本问题有答案。我尚未使用其他绑定源测试此解决方案，但由于 INotifyPropertyChanged 是数据绑定的基础，我怀疑该技术也适用于其他数据源。
Considering that my concern was with getting at the bound data changes, I stopped calculating on UI events and switched to listening to the PropertyChanged() event on the entity in question. This bypassed the problem and is working great... and is probably what I should have been doing in the first place.)
I will leave this as unanswered for now; perhaps someone still has an answer for the base question in terms of the focus event chain. I haven't tested this solution with other binding sources, but as INotifyPropertyChanged is the foundation of databinding I suspect the technique will work with other data sources.