[PowerShell每日技巧]有对话提示的强制参数(20140206)

DAIC

Typically, when you mark a function parameter as "mandatory", PowerShell will prompt the user when the user omits the parameter:

1. function Get-Something
   
2. {
   
3.       param
   
4.       (
   
5.             [Parameter(Mandatory=$true)]
   
6.             $Path
   
7.       )
   
8. 
   
9.       "You entered $Path"
   
10. }

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The result looks like this:

PS > Get-Something cmdlet Get-Something at command pipeline position 1 Supply values for the following parameters: Path:

Here is an alternative: if the user omits -Path, the function opens an OpenFile dialog:

1. function Get-Something
   
2. {
   
3.       param
   
4.       (
   
5.             $Path = $(
   
6.               Add-Type -AssemblyName System.Windows.Forms
   
7.               $dlg = New-Object -TypeName  System.Windows.Forms.OpenFileDialog
   
8.               if ($dlg.ShowDialog() -eq 'OK') { $dlg.FileName } else { throw 'No Path submitted'}
   
9.             )
   
10.       )
    
11. 
    
12.       "You entered $Path"
    
13. }

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http://powershell.com/cs/blogs/tips/archive/2014/02/06/mandatory-parameter-with-a-dialog.aspx