Put C# variable as parameter on ASP .NET custom control

Question

I have this code in my ASP page:

<%@ Register TagPrefix="genies" Namespace="TheNamespace" Assembly="TheAssembly"%>

...

<% string name = GetTag().Name; %>
<div class="<%= name %>"></div>
<genies:BarGenie ID="BarGenie1" runat="server" Title="<%= name %>" />

The BarGenie class has the following code:

public class BarGenie : Control {

    public string Title { get; set; }

    protected override void Render(HtmlTextWriter writer) {
        writer.Write("<div>" + Title + "</div>");
    }

}

This is the HTML that is generated:

<div class="E00383"></div>
<div><%= name %></div>

I'd like to see this HTML:

<div class="E00383"></div>
<div>E00383</div>

I've tried various things in the ASPX code: @name, <%# name %> etc but I can't figure out what's going on. Is there some other way of inserting a custom control that I should be using? Do I have the wrong approach to using this custom control?

Gage · Accepted Answer · 2012-01-25 22:00:03Z

3

Try using GetTag().Name instead of name.

Also check out http://www.scottfindlater.co.uk/blog/asp-net-inline-code-and it may help

As in

<div class="<%= GetTag().Name%>"></div>
<genies:BarGenie ID="BarGenie1" runat="server" Title="<%= GetTag().Name%>" />

answered Jan 25, 2012 at 22:00

Gage

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4 Comments

Josh Earl Over a year ago

He's calling the variable because he wants to reuse the value in at least two places.

wpearse Over a year ago

I made changes suggested by @JoshEarl, then replaced 'name' with 'GetTag().Name' and it's now working fine.

wpearse Over a year ago

But I don't get why GetTag().Name works, but name doesn't? So. Weird.

wpearse Over a year ago

@Gage, it needs to be Title="<%# GetTag().Name %>" with the <%# at the start (<%= doesn't work).

Josh Earl · Accepted Answer · 2012-01-25 21:50:31Z

2

Try this replacing the <%= %> tags with <%# %> and adding a call to this.DataBind(); in your codebehind.

answered Jan 25, 2012 at 21:50

Josh Earl

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1 Comment

wpearse Over a year ago

OK, added this.DataBind() as the first line of the Render method. I get a compiler error: The name 'name' does not exist in the current context. It looks like it's complaining about the 'Title="<%# name %>"' parameter...

Uwe Keim · Accepted Answer · 2012-01-26 06:35:07Z

1

how about setting that value in code-behind:

this.BarGenie1.Title = GetTag().Name;

edited Jan 26, 2012 at 6:35

Uwe Keim

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answered Jan 26, 2012 at 6:30

user191966

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