捕获从ASP.NET生成的HTML

<asp:Literal ID="litHtml" runat="server" />

protected void Page_Load(object sender, EventArgs e)
{
    // 创建一个StringWriter对象，用于保存HTML内容
    StringWriter stringWriter = new StringWriter();

    // 创建一个HtmlTextWriter对象，用于渲染HTML内容
    HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);

    // 创建一个Panel控件，用于渲染HTML内容
    Panel panel = new Panel();

    // 在Panel控件中添加HTML内容
    panel.Controls.Add(new LiteralControl("<h1>Hello, World!</h1>"));

    // 将Panel控件渲染到HtmlTextWriter对象中
    panel.RenderControl(htmlWriter);

    // 将渲染好的HTML内容赋值给Literal控件
    litHtml.Text = stringWriter.ToString();
}