Get public string in codebehind into LayoutTemplate of ListView

Question

A doubt in ASP.NET(VB)

I have a public variable in code-behind(ASPX.VB)

Public _orderCode As String = "Hello World"

At ASPX, I would like to access it inline. That too inside the LayoutTemplate of a ListView

<asp:ListView runat="server" ID="listView_OrderReplies" 
                DataKeyNames="ProductID"
                DataSourceID="sdsProducts">
    <LayoutTemplate>
        <h1>Order Replies for Order Code  = <%# _orderCode %></h1>
        <asp:PlaceHolder ID="itemPlaceholder" runat="server" ></asp:PlaceHolder>
    </LayoutTemplate>
    <ItemTemplate>
        <b>Name</b>:  <%#Eval("ProductName")%><br />
        <b>Stock</b>:  <%#Eval("UnitsInStock")%><br />
        <b>Price</b>:  <%#Eval("UnitPrice")%> <br />
    </ItemTemplate>
</asp:ListView>

That is, I want this inline binding to succeed

<h1>Order Replies for Order Code  = <%# _orderCode %></h1>

or

<h1>Order Replies for Order Code  = <%= _orderCode %></h1>

I know it will work inside the page if its not inside a databound control. What I need is a way to access the variable using inline code blocks.

Is it possible? Can anybody point me in the right direction?

BTW, I know to bind it in code-behind and all. I am looking for a specific solution if there is one and a confirmation if there isn't.

Nikola Bogdanović · Answer 1 · 2015-03-05T14:31:54.897

10

It can be done, and quite easily at that. Just handle OnLayoutCreated event, and in it call DataBind() method on LayoutTemplate control (all child controls will automatically databind as well).

<asp:ListView ID="lv" runat="server" OnLayoutCreated="lv_LayoutCreated">...</asp:ListView>

protected void lv_LayoutCreated(object sender, EventArgs e)
{
    lv.Controls[0].DataBind();
}

Just make sure that whatever data is being databound there, it is instantiated before that (on postbacks as well).

Or you can find a specific control in it, and databind just that: lv.Controls[0].FindControl("id").DataBind();

And if you want it databound only on ListView databinding, than do it in OnDataBound event - but you must target a control which doesn't contain itemPlaceholder, or your ItemTemplate will databind again (with no data this time):

protected void lv_DataBound(object sender, EventArgs e)
{
    if(lv.Controls.Count > 0)
        lv.Controls[0].FindControl("head").DataBind();
}

edited Mar 05 '15 at 14:31

answered Mar 23 '12 at 18:31

Nikola Bogdanović

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I had been searching for an answer to this for hours. Your solution is simple, elegant, and most importantly works! Thank you so much! – Baxter Mar 03 '14 at 19:38
Right when I was beginning to think accessing an element within a list view's layout template was impossible.. You, my friend, saved the day. – thebdawk05 May 15 '14 at 20:12
Perfect. You're my hero. This should be marked as the correct answer for this question. – Jargs Nov 11 '15 at 23:40

score 3 · Accepted Answer · edited May 23 '17 at 11:51

3

It cannot be done or at least I doubt it. My advise, use a literal control or label and assign the text at code-behind.

Check this post . Darko's answer was: Inline code is executed when the page is being rendered ie. after the Page_PreRender event and before the Unload event. Hence after databinding, your inline code is probably a 'goner' for it to work.

edited May 23 '17 at 11:51

Community

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answered Oct 17 '09 at 06:00

o.k.w

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for a real solution have a look at my answer – Nikola Bogdanović May 25 '12 at 01:13
Can confirm that Nikola's answer is the correct one. – Jargs Nov 11 '15 at 23:41

score 1 · Answer 3 · answered Nov 22 '11 at 21:19

This bug is also addressed here: http://www.codeproject.com/KB/aspnet/LayoutTemplate_DataBind.aspx

and here: http://forums.asp.net/p/1201992/3319344.aspx#3319344

The solutions provided here are to extend or adapt the ListView control and properly handle the data-binding of the LayoutTemplate.

Get public string in codebehind into LayoutTemplate of ListView

3 Answers3

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