vb.net 为计算器编写退格按钮
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Writing a backspace button for calculator
提问by Jose M.
I am working on a form with a Numbers keyboard and a backspace. The user enters the numbers on a textbox using the numbers provided in the form. I have a backspace button that I want to program. I wrote the following:
我正在处理带有数字键盘和退格键的表单。用户使用表单中提供的数字在文本框中输入数字。我有一个要编程的退格按钮。我写了以下内容：
Private Sub btnBackSpace_Click_1(sender As Object, e As EventArgs) Handles btnBackSpace.Click
'The procedure works as a backspace for the
'cash box
If txtCash.Text < " " Then
txtCash.Text = Mid(txtCash.Text, 1, Len(txtCash.Text) - 1 + 1)
Else
txtCash.Text = Mid(txtCash.Text, 1, Len(txtCash.Text) - 1)
End If
End Sub
The only problem is that it goes from the last character and back, which is fine, but I wanted to also go from the cursor placement.
唯一的问题是它从最后一个字符开始并返回，这很好，但我也想从光标位置开始。
How can I get that done.
我怎样才能做到这一点。
采纳答案by Hanlet Esca?o
This should do the trick:
这应该可以解决问题：
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
txtCash.Focus()
SendKeys.Send("{BACKSPACE}")
End Sub
回答by jmoreno
I would go with Hanlet's solution, but...the SelectionStartproperty of a textbox tells you where the caret sits. From there, you should be able to do the manipulation by hand if so desired.
我会使用 Hanlet 的解决方案，但是...文本框的SelectionStart属性会告诉您插入符号所在的位置。从那里，如果需要，您应该能够手动进行操作。
