为什么DialogResult的WPF中为空的布尔？ [英] Why is DialogResult a nullable bool in WPF?

问题描述

谁能想到一个很好的解释了一个事实，即一个对话的结果是在WPF中的可空布尔？这一直困惑我。在的WinForms它是一个枚举类型，并且做了很多我更有意义。

Can anyone think of a good explanation for the fact that result of a dialog is a nullable bool in WPF? This has always baffled me. In WinForms it was an enum type and that made a lot more sense to me.

推荐答案

在我看来，这样做是因为在大多数情况下你不需要的广义专业的选项，如重试或忽略。

In my opinion this was done because in most cases you don't need the generalized specialized options like Retry or Ignore.

如果您需要更多的确定/取消，你应该使用某种任务对话框，例如中书面出答案。这样，你不仅限于几个枚举值有人认为前几十年，而DialogResult的只是正/负基本使用，你可以实现自己的属性，它是特定于您的高级需求。因此，只有真/假是需要的，和空指示该窗口没有被关闭，但（没有值已被分配给属性尚未）。

If you need more than OK/Cancel, you are supposed to use some kind of task dialog, e.g. with written-out answers. That way, you're not limited to the few enum values someone thought of some decades ago, and the DialogResult is just positive/negative for basic use and you can implement your own property that is specific to your advanced needs. Therefore only true/false is needed, and null indicating that the window has not been closed yet (no value has been assigned to the property yet).

如果你有一个对话框，不仅仅是一个问题，用户应该回答（如报名表），你通常最好使用确定/取消，这样你就不会需要更多的价值。

If you have a dialog that is more than just a question the user should answer (e.g. an entry form), you're typically better off with OK/Cancel, so you don't need more values.

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