winforms - PowerShell 日历弹出窗口

Question

我正在尝试使用 http://technet.microsoft.com/en-us/library/ff730942.aspx 中的 PowerShell 脚本

选择日期并按 Enter 后，变量 $dtmDate 没有数据。请帮忙。是否可以添加确定/取消按钮？

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

$objForm = New-Object Windows.Forms.Form 

$objForm.Text = "Select a Date" 
$objForm.Size = New-Object Drawing.Size @(243,200) 
$objForm.StartPosition = "CenterScreen"

$objForm.KeyPreview = $True

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Enter") 
        {
            $dtmDate=$objCalendar.SelectionStart
            $objForm.Close()
        }
    })

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Escape") 
        {
            $objForm.Close()
        }
    })

$objCalendar = New-Object System.Windows.Forms.MonthCalendar 
$objCalendar.ShowTodayCircle = $False
$objCalendar.MaxSelectionCount = 1
$objForm.Controls.Add($objCalendar) 

$objForm.Topmost = $True

$objForm.Add_Shown({$objForm.Activate()})  
[void] $objForm.ShowDialog() 

if ($dtmDate)
    {
        Write-Host "Date selected: $dtmDate"
    }

Answer 1

$dtmDate在您的 if 语句的上下文中没有任何值(value)，因为该代码没有在您的 enter 按键上执行... Add_KeyDown 上下文中的 block 是。尝试执行类似这样的操作:

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

$dtmDate = $null

# I've moved your Date printing logic into this function that can be called elsewhere.
Function Do-Work
{
    if ($dtmDate -ne $null)
    {
        Write-Host "Date selected: $dtmDate"
    }
}

$objForm = New-Object Windows.Forms.Form 

$objForm.Text = "Select a Date" 
$objForm.Size = New-Object Drawing.Size @(243,200) 
$objForm.StartPosition = "CenterScreen"

$objForm.KeyPreview = $True

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Enter") 
        {
            $dtmDate = $objCalendar.SelectionStart        
            $objForm.Close()

            Do-Work
        }
    })

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Escape") 
        {
            $objForm.Close()
        }
    })

$objCalendar = New-Object System.Windows.Forms.MonthCalendar 
$objCalendar.ShowTodayCircle = $False
$objCalendar.MaxSelectionCount = 1
$objForm.Controls.Add($objCalendar) 

$objForm.Topmost = $True

$objForm.Add_Shown({$objForm.Activate()})  
[void] $objForm.ShowDialog() 

新功能 Do-Work定义在 Add_KeyDown 范围之外，但由于我们在那里调用它，它将在您的 Enter 按键上执行。