提示保存文本框更改 [英] prompt save on textbox change

问题描述

我有一个代码，提示保存文本框更改.我使用一个功能

i have a code that prompts save on textbox change. i use a function

Dim loaded As Boolean = False
    Dim txtChanged As Boolean = False

Private Sub Text_Changed(ByVal sender As Object, ByVal e As System.EventArgs)

        If loaded Then
            txtChanged = True
        End If
    End Sub

然后加载

then on load

For Each cntrl As Control In Me.GroupBox1.Controls
            If TypeOf (cntrl) Is TextBox Then
                AddHandler cntrl.TextChanged, AddressOf Text_Changed
            End If

并在关闭时检查标志.
这有效..但是一旦我退格或清除了特定的文本框，它仍然会以textchange的形式出现.

and on closing i check on the flag.
this works.. but once i backspace or clear a particular textbox, it still presents as a textchange. is there a turnaround for this?

推荐答案

TextChanged事件针对文本框中的每个文本更改(包括退格和清除文本)触发.如果您希望处理特定的更改，则必须相应地编写代码.例如，您可以处理KeyPress事件，如果按下Backspace，则可以在TextBox.Tag属性中设置一个标志，然后相应地处理这种情况.

The TextChanged event fires for every change of text in the textbox (this includes backspace and clearing the text). If you wish to handle specific changes, you have to write code accordingly. For example, you could handle the KeyPress event and if Backspace is pressed, you can set a flag in the TextBox.Tag property and then handle the situation accordingly.

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