单击 vb.net 后更改按钮的文本
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changing button's text after click vb.net
提问by AdorableVB
This is kinda simple, and really silly. but I can't see what I am missing..
这有点简单，而且非常愚蠢。但我看不到我错过了什么..
Private Sub btnmode_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnmode.Click
If Me.btnmode.Text = "COMMAND MODE" Then
Me.btnmode.Text = "DATA MODE"
sPort.Write("$$$")
End If
If Me.btnmode.Text = "DATA MODE" Then
Me.btnmode.Text = "COMMAND MODE"
sPort.Write("$$$" & vbCr)
sPort.Write("exit" & vbCr)
End If
End Sub
with this code, I should be able to change its text after clicking. but why is it not? nothing is happening.
使用此代码，我应该能够在单击后更改其文本。但为什么不是呢？什么都没有发生。
采纳答案by coder
If Me.btnLoad.Text = "COMMAND MODE" Then
Me.btnLoad.Text = "DATA MODE"
sPort.Write("$$$")
ElseIf Me.btnLoad.Text = "DATA MODE" Then
Me.btnLoad.Text = "COMMAND MODE"
sPort.Write("$$$" & vbCr)
sPort.Write("exit" & vbCr)
End If
回答by Rajaprabhu Aravindasamy
Use a select casein this situation, It will be more readable.
在这种情况下使用select case，它会更具可读性。
select case ucase(Me.btnmode.Text)
case "COMMAND MODE"
Me.btnmode.Text = "DATA MODE"
sPort.Write("$$$")
case "DATA MODE"
Me.btnmode.Text = "COMMAND MODE"
sPort.Write("$$$" & vbCr)
sPort.Write("exit" & vbCr)
End Select
Problemsfound in your code:
在您的代码中发现的问题：
If Me.btnmode.Text = "COMMAND MODE" Then
Me.btnmode.Text = "DATA MODE" '--------> Text been set as DATA MODE
sPort.Write("$$$") ' |
End If ' |
' |
If Me.btnmode.Text = "DATA MODE" Then ' ---------> Here again
Me.btnmode.Text = "COMMAND MODE" ' you are checking the Text with
sPort.Write("$$$" & vbCr) ' DATA MODE and you are assigning
sPort.Write("exit" & vbCr) ' the text back to COMMAND MODE
End If
So i guess initially your button's text is set with "COMMAND MODE". As a result, your button's text is refusing to revert back.
所以我猜最初你的按钮文本是用“命令模式”设置的。结果，您按钮的文本拒绝恢复。
