Question

我正在尝试通过Add_Click将处理程序添加到表单/ wpf按钮。我事先不知道函数名称，因此构造函数名称很重要。然后将其传递给Add_Click。

尝试以下操作，我会得到

$num = 1
function somefn1 () {}

$fn = $Function:"somefn$num"

$somebutton.Add_Click($fn)

错误是

Cannot convert argument "value", with value: "somefn1", for "add_Click" to type "System.Windows.RoutedEventHandler": "Cannot convert the 
"somefn1" value of type "System.String" to type "System.Windows.RoutedEventHandler"."
At xyz
+ ... $somebutton.Add_Click("somefn$num") }
+                              ~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodArgumentConversionInvalidCastArgument

我不确定如何解决。有任何想法或提示吗？

Answer 1

工作：使用字符串附加现有功能（注意处理程序的范围）

$elName = "theButton"  # => Name="theButton"
$fnName = "mynamespace." + "function_name"

$fns = Get-ChildItem function: | Where-Object { $_.Name -like $fnName }
$Form.FindName($elName).Add_Click( $fns[0].ScriptBlock )

function mynamespace.function_name($Sender, $EventArgs) {
  Write-Host "works !"
}

通过字符串作为块获取Powershell函数引用

1 个答案: