Question

I’m playing around with deriving from System.Web.UI.WebControls.Table/Cell/Row and can’t get HtmlTextWriter.AddAttribute to work:

Table:

public class Table : System.Web.UI.WebControls.Table
{
    public string Title { get; set; }
    public bool Sorted { get; set; }

    public Table()
    {
    }
}

Table Header Row:

public class TableHeaderRow : System.Web.UI.WebControls.TableHeaderRow
{
    public TableHeaderRow()
    {
        this.TableSection = TableRowSection.TableHeader;
        this.ClientIDMode = System.Web.UI.ClientIDMode.Static;
    }
}

Table Header Cell:

public class TableHeaderCell : System.Web.UI.WebControls.TableHeaderCell
{
    public TableHeaderCell()
    {
    }

    public override void RenderBeginTag(HtmlTextWriter writer)
    {
        AddAttributesToRender(writer);
        writer.AddAttribute("test", "whee");
        writer.WriteBeginTag("th");
        //writer.WriteAttribute("test", "whee");
        writer.WriteLine('>');
    }

    public override void RenderEndTag(HtmlTextWriter writer)
    {
        writer.WriteEndTag("th");
        writer.WriteLine();
    }
}

usage:

    <Internal:Table ID="somethingTbl" runat="server" Title="A Table" Sorted="true">
        <Internal:TableHeaderRow>
            <Internal:TableHeaderCell>
                Stuff
            </Internal:TableHeaderCell>
            <Internal:TableHeaderCell>
                More Stuff
            </Internal:TableHeaderCell>
            <Internal:TableHeaderCell>
                Less Stuff
            </Internal:TableHeaderCell>
        </Internal:TableHeaderRow>
    </Internal:Table>

And then some regular rows are added in the cs. I get the following partial output:

    <table id="activationsTbl">
<thead>
    <tr>
        <th>

                Stuff
            </th>
        <th>

                More Stuff
            </th>
        <th>

                Less Stuff
            </th>
    </tr>
</thead><tbody test="whee" test="whee" test="whee">
...

As you can see, the attributes are being written out with the next opening tag after all of the th tags (the tbody tag at the end). If I use the commented out WriteAttributes then it gets written correctly. If there aren’t any other rows (and thus no <tbody>), then the attributes are not written to any other tags.

Answer 1

And minutes later I realize that there is a difference between WriteBeginTag and RenderBeginTag *facepalm*.