创建Powershell表单,其中按钮将文本转换为语音

我正在尝试在PowerShell中结合两种我没有经验的东西。创建一个表单和文本到语音。对于文本到语音,我已经验证了这将与我对话:

Add-Type -AssemblyName System.speech

$speak = New-Object System.Speech.Synthesis.SpeechSynthesizer
$speak.Speak('My test speech')

在我的谷歌搜索中,我发现了一些关于创建文本框的信息。例如,这将创建一个只有取消按钮的框:

    Add-Type -AssemblyName System.Windows.Forms
    Add-Type -AssemblyName System.Drawing

    $form = New-Object System.Windows.Forms.Form
    $form.Text = 'Data Entry Form'
    $form.Size = New-Object System.Drawing.Size(300,200)
    $form.StartPosition = 'CenterScreen'

    $cancelButton = New-Object System.Windows.Forms.Button
    $cancelButton.Location = New-Object System.Drawing.Point(150,120)
    $cancelButton.Size = New-Object System.Drawing.Size(75,23)
    $cancelButton.Text = 'Cancel'
    $cancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
    $form.CancelButton = $cancelButton
    $form.Controls.Add($cancelButton)

    $result = $form.ShowDialog()

我希望能创建一个按钮来阅读我指定的文本,但我很难弄清楚。我已将其编辑为:

    Add-Type -AssemblyName System.speech

    $speak = New-Object System.Speech.Synthesis.SpeechSynthesizer

    Add-Type -AssemblyName System.Windows.Forms
    Add-Type -AssemblyName System.Drawing

    $form = New-Object System.Windows.Forms.Form
    $form.Text = 'Data Entry Form'
    $form.Size = New-Object System.Drawing.Size(300,200)
    $form.StartPosition = 'CenterScreen'

    $speakButton = New-Object System.Windows.Forms.Button
    $speakButton.Location = New-Object System.Drawing.Point(150,120)
    $speakButton.Size = New-Object System.Drawing.Size(75,23)
    $speakButton.Text = 'Speak'
    $speakButton.DialogResult = [System.Windows.Forms.DialogResult]$speak.Speak('My test speech')
    $form.text = $speakButton
    $form.Controls.Add($speakButton)

    $result = $form.ShowDialog()

当我启动这个功能时,它会在弹出框之前显示“我的测试演讲”,当我点击按钮时,什么也没发生。很明显,我走错了路,但我不确定正确的路在哪里。