[英]Powershell pass textbox as function argument
我正在使用PowerShell和System.Windows.Forms
制作一个简单的GUI表单。
对于每个文本框-按钮对,我希望按钮打开文件浏览器,并且一旦选择了文件,文件路径应写入相应的文本框中。
在下面的代码中, New-TextBox
创建一个标签和一个文本框, New-Button
创建一个按钮。
使用这些功能可以创建带有3个按钮的3个文本框。
然后,我创建了功能Set-FileDialogButton
。 它以按钮和文本框为参数,并应创建一个按钮单击事件,以打开文件浏览器,获取所选文件路径,并将其从参数写入文本框。
单击事件和文件浏览器起作用。 但是,选择文件后,我得到
The property 'Text' cannot be found on this object. Verify that the property exists and can b
e set.
At D:\...\test.ps1:62 char:5
+ $inputTextBox.Text = $FileBrowser.FileName
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertyNotFound
所以我假设在函数中传递文本框时我做错了什么。 如果我不将click事件包装在函数中,则我的代码可以正常工作。
编码:
Add-Type -assembly System.Windows.Forms
$main_form = New-Object System.Windows.Forms.Form
$main_form.Text ='AP209 Converter GUI'
$main_form.Width = 300
$main_form.Height = 200
$main_form.AutoSize = $true
#Creates a label and text box:
function New-TextBox($labelText, $x, $y, $w){
$label = New-Object System.Windows.Forms.Label
$label.Text = $labelText
$label.Location = New-Object System.Drawing.Point($x, $y)
$label.AutoSize = $true
$main_form.Controls.Add($label)
$textbox = New-Object system.Windows.Forms.TextBox
$textbox.multiline = $false
$textbox.width = $w
$textbox.height = 20
$textbox.location = New-Object System.Drawing.Point(($x + 50), $y)
$main_form.Controls.Add($textbox)
return $textbox
}
#Creates a button with $text as label:
function New-Button($text, $x, $y, $w, $h){
$button = New-Object System.Windows.Forms.Button
$button.Location = New-Object System.Drawing.Size($x, $y)
$button.Size = New-Object System.Drawing.Size($w, $h)
$button.Text = $text
$main_form.Controls.Add($button)
return $button
}
$textBoxW = 100
$labelX = 0
$buttonX = $x + 155
$y = 10
$dy = 30
$buttonW = 25
$buttonH = 20
#Create 3 text boxes and buttons:
$textbox1 = New-TextBox "File 1" $labelX $y $textBoxW
$button1 = New-Button "..." $buttonX $y $buttonW $buttonH
$y = $y + $dy
$textbox2 = New-TextBox "File 2" $labelX $y $textBoxW
$button2 = New-Button "..." $buttonX $y $buttonW $buttonH
$y = $y + $dy
$textbox3 = New-TextBox "File 3" $labelX $y $textBoxW
$button3 = New-Button "..." $buttonX $y $buttonW $buttonH
#Set click event to button:
function Set-FileDialogButton($button, $inputTextBox){
$button.Add_Click(
{
$FileBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{ InitialDirectory = $loadpath}
$fileBrowserReturned = $FileBrowser.ShowDialog()
if($fileBrowserReturned -eq "OK"){
$inputTextBox.Text = $FileBrowser.FileName
$inputTextBox.SelectionStart = $inputTextBox.Text.Length;
}
}
)
}
Set-FileDialogButton $button1 $textbox1
Set-FileDialogButton $button2 $textbox2
Set-FileDialogButton $button3 $textbox3
$main_form.ShowDialog()
您需要在定义时捕获变量引用,并将它们绑定到事件处理程序的本地范围。 您可以使用GetNewClosure()
做到这一点:
#Set click event to button:
function Set-FileDialogButton($button, $inputTextBox){
$button.Add_Click(
{
$FileBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{ InitialDirectory = $loadpath}
$fileBrowserReturned = $FileBrowser.ShowDialog()
if($fileBrowserReturned -eq "OK"){
$inputTextBox.Text = $FileBrowser.FileName
$inputTextBox.SelectionStart = $inputTextBox.Text.Length;
}
}.GetNewClosure()
)
}
使用当前代码,直到执行事件处理程序后,变量才会被绑定。 因此,inputTextBox为null。
尝试这个:
Add-Type -assembly System.Windows.Forms
$main_form = New-Object System.Windows.Forms.Form
$main_form.Text ='AP209 Converter GUI'
$main_form.Width = 300
$main_form.Height = 200
$main_form.AutoSize = $true
#Creates a label and text box:
function New-TextBox($labelText, $x, $y, $w){
$label = New-Object System.Windows.Forms.Label
$label.Text = $labelText
$label.Location = New-Object System.Drawing.Point($x, $y)
$label.AutoSize = $true
$main_form.Controls.Add($label)
$textbox = New-Object system.Windows.Forms.TextBox
$textbox.multiline = $false
$textbox.width = $w
$textbox.height = 20
$textbox.location = New-Object System.Drawing.Point(($x + 50), $y)
$main_form.Controls.Add($textbox)
return $textbox
}
#Creates a button with $text as label:
function New-Button($text, $x, $y, $w, $h){
$button = New-Object System.Windows.Forms.Button
$button.Location = New-Object System.Drawing.Size($x, $y)
$button.Size = New-Object System.Drawing.Size($w, $h)
$button.Text = $text
$main_form.Controls.Add($button)
return $button
}
$textBoxW = 100
$labelX = 0
$buttonX = $x + 155
$y = 10
$dy = 30
$buttonW = 25
$buttonH = 20
#Create 3 text boxes and buttons:
$textbox1 = New-TextBox "File 1" $labelX $y $textBoxW
$textbox1.Name = 'textbox1'
$button1 = New-Button "..." $buttonX $y $buttonW $buttonH
$button1.Name = 'button1'
$y = $y + $dy
$textbox2 = New-TextBox "File 2" $labelX $y $textBoxW
$textbox2.Name = 'textbox2'
$button2 = New-Button "..." $buttonX $y $buttonW $buttonH
$button2.Name = 'button2'
$y = $y + $dy
$textbox3 = New-TextBox "File 3" $labelX $y $textBoxW
$textbox3.Name = 'textbox3'
$button3 = New-Button "..." $buttonX $y $buttonW $buttonH
$button3.Name = 'button3'
foreach( $control in $main_form.Controls ) {
if( $control.Name -like 'button*' ) {
$control.Add_Click(
{
$FileBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{ InitialDirectory = $loadpath}
$fileBrowserReturned = $FileBrowser.ShowDialog()
if($fileBrowserReturned -eq [System.Windows.Forms.DialogResult]::OK ) {
$controlNumber = $this.Name -replace '^\D+(\d+)$', '$1'
$textboxName = 'textbox' + $controlNumber
foreach( $control in $this.parent.Controls ) {
if( $control.Name -eq $textboxName ) {
$control.Text = $FileBrowser.FileName
$control.SelectionStart = $control.Text.Length
}
}
}
} )
}
}
$main_form.ShowDialog()
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