VB.NET 输入框 - 如何识别何时按下取消按钮? [英] VB.NET Inputbox - How to identify when the Cancel Button is pressed?

问题描述

我有一个简单的 Windows 应用程序，它会弹出一个输入框，供用户输入日期进行搜索.

I have a simple windows application that pops up an input box for users to enter in a date to do searches.

我如何确定用户是点击了取消"按钮，还是仅仅按下了确定"而不输入任何数据，因为两者似乎都返回了相同的值?

How do I identify if the user clicked on the Cancel button, or merely pressed OK without entering any data as both appear to return the same value?

我找到了一些在 VB 6 中处理这个问题的例子，但它们都没有在 .NET 世界中真正起作用.

I have found some examples of handling this in VB 6 but none of them really function in the .NET world.

理想情况下，我想知道如何分别处理空的 OK 和 Cancel，但只要有一个处理取消的好方法我就完全可以了.

Ideally I would like to know how to handle the empty OK and the Cancel seperately, but I would be totally ok with just a good way to handle the cancel.

推荐答案

这是我所做的，它非常适合我想要做的事情:

Here is what I did and it worked perfectly for what I was looking to do:

Dim StatusDate As String
 StatusDate = InputBox("What status date do you want to pull?", "Enter Status Date", " ")

        If StatusDate = " " Then
            MessageBox.Show("You must enter a Status date to continue.")
            Exit Sub
        ElseIf StatusDate = "" Then
            Exit Sub
        End If

这个键是将输入框的默认值设置为一个实际的空格，所以用户只按确定按钮将返回值""，而按取消返回"

This key was to set the default value of the input box to be an actual space, so a user pressing just the OK button would return a value of " " while pressing cancel returns ""

从可用性的角度来看，输入框中的默认值开始突出显示，并在用户键入时清除，因此体验与该框没有值时没有什么不同.

From a usability standpoint, the defaulted value in the input box starts highlighted and is cleared when a user types so the experience is no different than if the box had no value.

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