DataBinding Vs Looping

Question

Possible Duplicate:
Using ASP.NET Controls without databinding

My previous question yielded few results so I thought I would reword the question and try again.

foreach (XXX x in TTTT){ %>
       <tr>
           <td><%=x.val %></td>
               <asp:ImageButton runat="server" CommandName="uiImgResolve_Click"
               CommandArgument='<%=X.pkid%>' ImageUrl="../images/IMG.png"/>
     <% } %>

This will not work as I cannot set a value in any control that has the RUNTAT attribute set. What is the best way to give each row a value so when the on click event happens I can read in the value of the item clicked, I cannot put the value on the query string and I cannot use asp.net databinding.

what I am doing is much more complex then this, databinding will not work.

PERHAPS a better way of asking the question is is there anyway to use the looping mechanism above and still maintain a link to a method on the codebehind of a control?

Answer 1

I would recommend looking into the ASP repeater control. It provides an ItemDatabound event that allows you to manipulate the contents that is being dynamically generated.

Answer 2

Mixing code into your markup really does not work well with ASP.Net server controls. There are several better alternatives. Here's one:

Markup:

<table>
  <asp:Placeholder id="RowPlaceholder" runat="server" />
</table>

Code behind:

foreach (MyObject x in TT)
{
   Literal l1 = new Literal();
   l1.Text = string.Format("<tr><td>{0}</td><td>", x.val);

   ImageButton b = new ImageButton();
   b.ImageUrl = "../images/IMG.png";
   b.CommandArgument = x.pkid;
   b.CommandName = "uiImgResolve_Click";  // maybe do this a little differenlty

   Literal l2 = new Literal();
   l2.TExt = "</td></tr>";

   RowPlaceholder.Controls.Add(l1);
   RowPlaceHolder.Controls.Add(b);
   RowPlaceHodler.Controls.Add(l2);

}

Answer 3

A Repeater and even a GridView might just work. There's a need to perform OnRowCommand though. Definitely cleaner like what Paddy said.

ASPX

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
    <Columns>
        <asp:BoundField DataField="val" />
        <asp:TemplateField>
            <ItemTemplate>
                <asp:ImageButton ID="Button1" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

CodeBehind:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        GridView1.DataSource = TTTT;
        GridView1.DataBind();
    }
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType != DataControlRowType.DataRow)
        return;

    XXX x = (XXX)e.Row.DataItem;
    ImageButton btn = (ImageButton)e.Row.FindControl("Button1");
    btn.CommandArgument = x.pkid;
    btn.ImageUrl = "../images/IMG.png";
}