写一个powershell的简单GUI做本地任务，试验出2个方法：

方法1：

function btn1_click {
   	write-host $text1.Text -ForegroundColor Green -BackgroundColor Black
}

$btn1.Add_Click({btn1_click})

方法2：

$btn2_click = {
	write-host $text2.Text -ForegroundColor Cyan -BackgroundColor Black
}

$btn2.Add_Click($btn2_click)

完整代码：

$form = New-Object System.Windows.Forms.Form
$form.Text = 'DIY task' #文本，即窗体标题 
$form.Size = New-Object System.Drawing.Size(600, 300) #窗体大小，长为600，宽为300
$form.StartPosition = 'CenterScreen' #出现的位置为屏幕中央


$btn1 = New-Object System.Windows.Forms.Button #创建按钮
$btn1.Location = New-Object System.Drawing.Size(10,10)
$btn1.Size = New-Object System.Drawing.Size(100,20)
$btn1.Text = "task1"
$btn1.Add_Click({btn1_click})
$form.Controls.Add($btn1)


$text1 = New-Object System.Windows.Forms.TextBox #创建文本框
$text1.Location = New-Object System.Drawing.Point(150, 10)
$text1.Size = New-Object System.Drawing.Size(200, 20)
$form.Controls.Add($text1)


$btn2 = New-Object System.Windows.Forms.Button  
$btn2.Location = New-Object System.Drawing.Size(10, 50)
$btn2.Size = New-Object System.Drawing.Size(100,20)
$btn2.Text = "task2"
$btn2.Add_Click($btn2_click)
$form.Controls.Add($btn2)


$text2 = New-Object System.Windows.Forms.TextBox #创建文本框
$text2.Location = New-Object System.Drawing.Point(150, 50)
$text2.Size = New-Object System.Drawing.Size(200, 20)
$form.Controls.Add($text2)


$form.Topmost = $true #是否强制窗体在其他已打开的窗体和对话框上打开，True为强制
$form.showdialog()


# task function
$btn2_click = {
	write-host $text2.Text -ForegroundColor Cyan -BackgroundColor Black
}

function btn1_click {
   	write-host $text1.Text -ForegroundColor Green -BackgroundColor Black
}