UserControl的RenderControl在（C＃.NET）中请求表单标签 [英] UserControl's RenderControl is asking for a form tag in (C# .NET)

问题描述

我问了呈现UserControl的HTML ，并使代码可用于动态生成的UserControl。

I asked how to render a UserControl's HTML and got the code working for a dynamically generated UserControl.

现在，我正在尝试使用LoadControl加载以前生成的Control和吐出它的HTML，但这给了我：

Now I'm trying to use LoadControl to load a previously generated Control and spit out its HTML, but it's giving me this:

类型为'TextBox'的控件必须放在带有runat = server的表单标记中。

我实际上并没有在页面上添加控件，我只是在尝试获取其HTML。有什么想法吗？

I'm not actually adding the control to the page, I'm simply trying to grab its HTML. Any ideas?

以下是我正在玩的一些代码：

Here's some code I'm playing with:

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

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

return myTextWriter.ToString();

推荐答案

或者，您可以在以下位置禁用ServerForm / Event-validation

Alternatively you could disable the ServerForm/Event-validation on the page that is rendering the control to a string.

以下示例说明了如何执行此操作。

The following example illustrates how to do this.

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 */}
    }
}

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