如何在jsPDF中获取文本的高度

Question

我正在尝试打印包含HTML的变量。我的问题是html是动态的...例如...

public MainPage()
{
    InitializeComponent();
    label.Text=await Task.Run(TaskTest); //this doesn't work
}

private async Task<string> TaskTest()
    {
        try
        {
            using (WebClient client = new WebClient())
            {
               return await client.DownloadStringTaskAsync("https://www.example.com/return.php");
//also tried w/ no success:
//return client.DownloadStringTaskAsync("https://www.example.com/return.php").Result;
            }
        }
        catch (Exception)
        {
            throw;
        }
    }

因此，如果我想在文本底部添加一些内容...我需要知道它键入的最后位置或此块的高度...

有什么方法可以知道此块的总高度是多少？或....最后键入的坐标是什么？...或行数...？

我正在像这样打印此变量...

// the number of <p> is dinamic... this value comes from a text editor.. 
//so the number of <p> can change...

   var text: "<div><p>Line 1</p><p> Line 2</p></div>"