Question

我正在制作一个带有PowerShell GUI的计算器作为培训。我从其他脚本复制/粘贴计算器，并且id正常工作。在新脚本上， - ，/，^，√工作但+，*不起作用。

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")

[void] 
[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")

$objFormfenster1 = New-Object System.Windows.Forms.Form
$objFormfenster1.Backcolor="white"
$objFormfenster1.StartPosition = "CenterScreen"
$objFormfenster1.Size = New-Object System.Drawing.Size(500,500)
$objFormfenster1.Text = "Calculator with GUI"

$objLabelfenster1 = New-Object System.Windows.Forms.Label
$objLabelfenster1.Location = New-Object System.Drawing.Size(30,30)
$objLabelfenster1.Size = New-Object System.Drawing.Size(200,40)
$objLabelfenster1.Text = "Geben Sie die erste Zahl ein (wenn Sie keine zahl eingeben wird automatisch 0 genommen):"
$objFormfenster1.Controls.Add($objLabelfenster1)

$objTextBoxfenster1 = New-Object System.Windows.Forms.TextBox
$objTextBoxfenster1.Location = New-Object System.Drawing.Size(30,70)
$objTextBoxfenster1.Size = New-Object System.Drawing.Size(300,30)
$objTextBoxfenster1.Text
$objFormfenster1.Controls.Add($objTextBoxfenster1)

$objLabelfenster1 = New-Object System.Windows.Forms.Label
$objLabelfenster1.Location = New-Object System.Drawing.Size(30,110)
$objLabelfenster1.Size = New-Object System.Drawing.Size(200,40)
$objLabelfenster1.Text = "Wählen Sie den Operator aus (bei Wurzel nur im ersten Feld zahl eingeben):"
$objFormfenster1.Controls.Add($objLabelfenster1)

$objComboboxfenster1 = New-Object System.Windows.Forms.Combobox
$objComboboxfenster1.Location = New-Object System.Drawing.Size(30,150)
$objComboboxfenster1.Size = New-Object System.Drawing.Size(300,30)
$objComboboxfenster1.Height = 70
$objFormfenster1.Controls.Add($objComboboxfenster1)
[void] $objComboboxfenster1.Items.Add("+")
[void] $objComboboxfenster1.Items.Add("-")
[void] $objComboboxfenster1.Items.Add("*")
[void] $objComboboxfenster1.Items.Add("/")
[void] $objComboboxfenster1.Items.Add("^")
[void] $objComboboxfenster1.Items.Add("√")
$objComboboxfenster1.SelectedItem
$objComboboxfenster1.Add_SelectedIndexChanged({ })

$objLabelfenster2 = New-Object System.Windows.Forms.Label
$objLabelfenster2.Location = New-Object System.Drawing.Size(30,190)
$objLabelfenster2.Size = New-Object System.Drawing.Size(200,40)
$objLabelfenster2.Text = "Geben Sie die zweite Zahl ein (wenn Sie keine zahl eingeben wird automatisch 0 genommen):"
$objFormfenster1.Controls.Add($objLabelfenster2)

$objTextBoxfenster2 = New-Object System.Windows.Forms.TextBox
$objTextBoxfenster2.Location = New-Object System.Drawing.Size(30,230)
$objTextBoxfenster2.Size = New-Object System.Drawing.Size(300,30)
$objTextBoxfenster2.Text
$objFormfenster1.Controls.Add($objTextBoxfenster2)

$GoButtonfenster1 = New-Object System.Windows.Forms.Button
$GoButtonfenster1.Location = New-Object System.Drawing.Size(120,405)
$GoButtonfenster1.Size = New-Object System.Drawing.Size(100,30)
$GoButtonfenster1.Text = "Go"
$GoButtonfenster1.Name = "Go"
$GoButtonfenster1.DialogResult = "None"
$GoButtonfenster1.Add_Click({
  $zahl1 = $null
  $zahl2 = $null
  $operator = $null
  [string]$zahl1 = $objTextBoxfenster1.Text
  [string]$zahl2 = $objTextBoxfenster2.Text
  $operator = $objComboboxfenster1.SelectedItem
  $iserror = "False"

  $zahl1 = $zahl1 -as [int]
   if($zahl1 -like $null) {
     $iserror = "True"
     $result = $null
   }  

  $zahl2 = $zahl2 -as [int]
   if($zahl2 -like $null) {
     $iserror = "True"
     $result = $null
  }

  if ($iserror -eq "True"){
     [System.Windows.Forms.MessageBox]::Show("Error: Eine Zahl wurde falsch eingegeben","Error") 
  }

    switch ($operator) {
        "+" {$result = $zahl1 + $zahl2}
        "-" {$result = $zahl1 - $zahl2}
        "*" {$result = $zahl1 * $zahl2}
        "/" {$result = $zahl1 / $zahl2}
        "^" {$result = [math]::pow( $zahl1, $zahl2 )}
        "√" {$result = [math]::sqrt( $zahl1 ) }
    default {$iserror = "True"}  
}

  if ($iserror -eq "False"){
     [System.Windows.Forms.MessageBox]::Show("$result","Das Ergebniss") 
  }
})
$objFormfenster1.Controls.Add($GoButtonfenster1)

$CancelButtonfenster1 = New-Object System.Windows.Forms.Button
$CancelButtonfenster1.Location = New-Object System.Drawing.Size(30,405)
$CancelButtonfenster1.Size = New-Object System.Drawing.Size(100,30)
$CancelButtonfenster1.Text = "Exit"
$CancelButtonfenster1.Name = "Exit"
$CancelButtonfenster1.DialogResult = "Cancel"
$CancelButtonfenster1.Add_Click({$objFormfenster1.Close()})
$objFormfenster1.Controls.Add($CancelButtonfenster1)

[void] $objFormfenster1.ShowDialog()

Scriptinputtranslation（德语 - ＆gt; Englisch）

如果您运行脚本，它首先会要求您输入第一个号码，然后是运营商，然后是第二个号码。如果您在数字字段中添加字母或其他字符，则会在向其中一个字段中输入错误字符时出错。如果输入数字并选择一个操作符，将弹出一个窗口并告诉您结果。

Answer 1

如果您在控制台中进行简单测试，我发现您正在尝试逐字符串地增加字符串：

"2" * 2"

你将获得22而不是4

2 * 2

结果将是正确的：4

所以只需将结果转换为$ zahl1 / $ zahl2变量到int类型，你就会得到正确的结果：

所以，更改此部分（我刚刚修改了＆＃39; *＆＃39;和＆＃39; +＆＃39;，您更改了其余部分）：

switch ($operator) {
        "+" {$result = [int]$zahl1 + [int]$zahl2}
        "-" {$result = $zahl1 - $zahl2}
        "*" {$result = [int]$zahl1 * [int]$zahl2}
        "/" {$result = $zahl1 / $zahl2}
        "^" {$result = [math]::pow( $zahl1, $zahl2 )}
        "√" {$result = [math]::sqrt( $zahl1 ) }
    default {$iserror = "True"}

或更改此部分：

[int]$zahl1 = $objTextBoxfenster1.Text
[int]$zahl2 = $objTextBoxfenster2.Text

Answer 2

你的问题从这里开始：

[string]$zahl1 = $objTextBoxfenster1.Text
[string]$zahl2 = $objTextBoxfenster2.Text

此时您已强烈输入$zahl1和$zahl2。现在发生的是，对这些变量的每个赋值都是自动转换为字符串。您可以确认这是变量属性System.Management.Automation.ArgumentTypeConverterAttribute

的存在

[string]$var = "5"
Get-Variable var | ft *

因此，即使您尝试在后面的代码中将它们键入[int]，它们仍然是字符串。

[string]$var = "5"
write-host "`$var: $var is $($var.GetType().Fullname)"
$var = $var -as [int]
write-host "`$var: $var is $($var.GetType().Fullname)"

<强>输出

$var: 5 is System.String
$var: 5 is System.String

因此，如果我删除变量和强类型声明，我会得到您可能期望的结果。

remove-variable var
$var = "5"
write-host "`$var: $var is $($var.GetType().Fullname)"
$var = $var -as [int]
write-host "`$var: $var is $($var.GetType().Fullname)"

<强>输出

$var: 5 is System.String
$var: 5 is System.Int32

您可能只是简化了一些逻辑

$zahl1 = $objTextBoxfenster1.Text -as [int]
$zahl2 = $objTextBoxfenster2.Text -as [int]

if($zahl1 -and $zahl2){
    # Do your switch based math now
} else {
    # something is wrong with one of them
    Write-Warning "try again.... with real numbers this time."
}

带有GUI +和*的计算器不起作用

2 个答案: