Retrieve contents of HtmlGenericControl inside ASCX WebControl

问题

I have an HtmlGenericControl which is a simple DIV with runat=server

This Control is embedded inside of an ASCX WebControl which resides on multiple pages. At Page_Load this element is populated by a repeater that is data-bound to database data that is Page Specific.

The trouble I'm having is ASCX WebControls don't seem to read the contents of their own elements very easily.

So far this has failed: How do I get the HTML output of a UserControl in .NET (C#)?

I'm looking for a way to get the contents of the HtmlGenericControl inside of a button click. How would I do that?

Simplifying previous question. Retrieve HTML of specific element in ASCX

回答1:

OK, I got it working (I think...)

Output

ASPX Code behind

    public override void VerifyRenderingInServerForm(Control control)
    {
        //base.VerifyRenderingInServerForm(control);
    }

ASPX markup

%@ Page EnableEventValidation="false" .....

User control code behind

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            var d = new QuestionsContext().GetQuestions();

            this.repeater.DataSource = d;
            this.repeater.DataBind();
        }
    }

    protected void getContent_Click(object sender, EventArgs e)
    {
        var sb = new StringBuilder();

        this.generic.RenderControl(new HtmlTextWriter(new StringWriter(sb)));

        string s = sb.ToString();

        this.Trace.Warn(Server.HtmlEncode(s));
        this.message.Text = Server.HtmlEncode(s);
    }

User control markup

<div runat="server" id="generic">
    <asp:Repeater runat="server" ID="repeater" >
        <ItemTemplate>
            <%# Eval("QuestionText") %>
        </ItemTemplate>
    </asp:Repeater>
</div>

<br />
<asp:Button Text="Get content" ID="getContent" runat="server" OnClick="getContent_Click" />
<br />
<asp:Label ID="message" runat="server" />

来源：https://stackoverflow.com/questions/11622541/retrieve-contents-of-htmlgenericcontrol-inside-ascx-webcontrol