UserControl的RenderControl要求(C#.NET)中的表单标记

Question

我问过如何呈现UserControl的HTML并让代码适用于动态生成的UserControl.

现在我正在尝试使用LoadControl来加载以前生成的Control并吐出它的HTML,但它给了我这个:

必须将带有'TextBox'类型的控件放在带有runat = server的表单标记内.

我实际上并没有将控件添加到页面中,我只是想抓取它的HTML.有任何想法吗？

这是我正在玩的一些代码:

TextWriter myTextWriter = new StringWriter();
HtmlTextWriter myWriter = new HtmlTextWriter(myTextWriter);

UserControl myControl = (UserControl)LoadControl("newUserControl.ascx");
myControl.RenderControl(myWriter);

return myTextWriter.ToString();

Answer 1

或者,您可以在将控件呈现为字符串的页面上禁用ServerForm/Event-validation.

以下示例说明了如何执行此操作.

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string rawHtml = RenderUserControlToString();
    }

    private string RenderUserControlToString()
    {
        UserControl myControl = (UserControl)LoadControl("WebUserControl1.ascx");

        using (TextWriter myTextWriter = new StringWriter())
        using (HtmlTextWriter myWriter = new HtmlTextWriter(myTextWriter))
        {
            myControl.RenderControl(myWriter);

            return myTextWriter.ToString();
        }
    }

    public override void VerifyRenderingInServerForm(Control control)
    { /* Do nothing */ }

    public override bool EnableEventValidation
    {
        get { return false; }
        set { /* Do nothing */}
    }
}