按下按钮后winform没有动作 [英] winforms no action after pressing button
问题描述
目标是在按下System.Windows.Forms.Button
后更改System.Windows.Forms.Label
的文本.我有以下 OOP 代码.其中 (几乎)有效:
The goal is to change text of System.Windows.Forms.Label
after pressing System.Windows.Forms.Button
. I have following OOP code. Which (almost) works:
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
class MyForm : System.Windows.Forms.Form {
MyForm($mystuff) {
#Do-Stuff
$this.Add_Load( $this.MyForm_Load )
}
$MyForm_Load = {
$mlabel = [System.Windows.Forms.Label]::new()
$mlabel.Name = "status"
$mlabel.Text = "enabled"
$mbutton = [System.Windows.Forms.Button]::new()
$mbutton.Text = "toggle state"
$mbutton.Location = [System.Drawing.Point]::new(100,100)
$mbutton.Add_Click( $this.mbutton_click )
$this.Controls.Add($mlabel)
$this.Controls.Add($mbutton)
}
$mbutton_click = {
if ($this.Parent.Controls["status"].Text -eq "enabled"){
$this.Parent.Controls["status"].Text = "disabled"
}
else{
$this.Parent.Controls["status"].Text = "enabled"
}
}
}
$foo = [MyForm]::new("test")
$foo.ShowDialog()
现在我正在尝试将其重写为不起作用的程序样式:
Now I'm trying to rewrite it to procedural style which is not working:
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
$global:mbutton = [System.Windows.Forms.Button]::new()
$mbutton.Text = "toggle state"
$mbutton.Location = [System.Drawing.Point]::new(100,100)
# $mbutton.Add_Click( {Button_Click} ) # pressing button shows errors on console
$global:mlabel = [System.Windows.Forms.Label]::new()
$mlabel.Name = "status"
$mlabel.Text = "enabled"
$global:Form = New-Object System.Windows.Forms.Form
$Form.Controls.Add($mlabel)
$Form.Controls.Add($mbutton)
$Form.ShowDialog() | Out-Null
$mbutton.Add_Click( {Button_Click} ) # pressing button does nothing
Function Button_Click() {
if ($Form.Parent.Controls["status"].Text -eq "enabled"){
$Form.Parent.Controls["status"].Text = "disabled"
}
else{
$Form.Parent.Controls["status"].Text = "enabled"
}
}
我做错了什么?我该如何调试此类问题?
What I did wrong? How can I debug such issue?
推荐答案
除非绝对需要,否则最好不要使用全局定义.但是在这种情况下,如果您稍微改变一下顺序,它就会起作用:
It's best not to use global definitions unless you absolutely need them. But in this case it WILL work if you change the order of things a little:
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
Function Button_Click() {
if ($mlabel.Text -eq "enabled"){
$mlabel.Text = "disabled"
}
else{
$mlabel.Text = "enabled"
}
}
$global:mbutton = [System.Windows.Forms.Button]::new()
$mbutton.Text = "toggle state"
$mbutton.Location = [System.Drawing.Point]::new(100,100)
# $mbutton.Add_Click( {Button_Click} ) # pressing button shows errors on console
$global:mlabel = [System.Windows.Forms.Label]::new()
$mlabel.Name = "status"
$mlabel.Text = "enabled"
$global:Form = New-Object System.Windows.Forms.Form
$Form.Controls.Add($mlabel)
$Form.Controls.Add($mbutton)
$mbutton.Add_Click( {Button_Click} ) # pressing button does nothing
$Form.ShowDialog() | Out-Null
通常将显示表单作为最后一个操作是一种很好的做法,因为您需要定义它使用的所有内容,但无论如何,在显示表单之前需要定义单击事件...
Generally it's good practice to make showng the form the last action because you need to define everything it uses but in any case, a click event needs to be defined before you show the form...
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