VB.NET中的Me.Invoke实际上并不“Invoke”——线程在Invoke语句上暂停

我有以下代码:

Public Delegate Sub SetStatusBarTextDelegate(ByVal StatusText As String)
Private Sub SetStatusBarText(ByVal StatusText As String)
    If Me.InvokeRequired Then
        Me.Invoke(New SetStatusBarTextDelegate(AddressOf SetStatusBarText), StatusText)
    Else
        Me.labelScanningProgress.Text = StatusText
    End If
End Sub

有没有想过为什么线程似乎害怕调用?