Binding Hyperlink.NavigateUrl declaratively

[Dmitry Duginov]

I have a FormView and a HyperLink on the page.

If I use the following code behind (hooked up to Hyperlink's OnLoad event),
it renders fine

protected void link_Load(object sender, EventArgs e)
{
link.NavigateUrl = String.Format("~/Carrier/AddNew.aspx?Id={0}",
FormView1.DataKey.Value);
}

However, I was not able to achieve the same goal declaratively, just using
<%# ... %> syntax in .aspx

Where's the catch?



Dmitry

 

[densial]

I have a FormView and a HyperLink on the page.

If I use the following code behind (hooked up to Hyperlink's OnLoad event),
it renders fine

protected void link_Load(object sender, EventArgs e)
{
link.NavigateUrl = String.Format("~/Carrier/AddNew.aspx?Id={0}",
FormView1.DataKey.Value);
}

However, I was not able to achieve the same goal declaratively, just using
<%# ... %> syntax in .aspx

Where's the catch?

Dmitry

show us your code for the second one

 

[Dmitry Duginov]

show us your code for the second one

Any of the following renders just text instead of hyperlink:
NavigateUrl='<%# String.Format("~/Carrier/AddNew.aspx?Id={0}",
Eval("FormView1.DataKey.Value")) %>'

NavigateUrl='<%# String.Format("~/Carrier/AddNew.aspx?Id={0}",111) %>'

NavigateUrl='<%# Eval("FormView1.DataKey.Value") %>'

D.

 

[Walter Wang [MSFT]]

Hi Dmitry,

I've done some test and both of following approaches should work for you:


<asp:HyperLink ID="link1" runat="server" Text="Link" NavigateUrl='<%#
String.Format("~/Carrier/AddNew.aspx?id={0}", Eval("Id"))
%>'></asp:HyperLink>
<br />
<asp:HyperLink ID="link2" runat="server" Text="Link2" NavigateUrl='<%#
String.Format("~/Carrier/AddNew.aspx?id={0}", FormView1.DataKey.Value)
%>'></asp:HyperLink>



The first one is assuming you need to use some field as the id; the second
one is the exact case as yours.

Please feel free to let me know if there's anything I can help.


Regards,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

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[Dmitry Duginov]

Hi Dmitry,

I've done some test and both of following approaches should work for you:


<asp:HyperLink ID="link1" runat="server" Text="Link" NavigateUrl='<%#
String.Format("~/Carrier/AddNew.aspx?id={0}", Eval("Id"))
%>'></asp:HyperLink>
<br />

First one doesn't woudn't since I dont have Id control

<asp:HyperLink ID="link2" runat="server" Text="Link2" NavigateUrl='<%#
String.Format("~/Carrier/AddNew.aspx?id={0}", FormView1.DataKey.Value)
%>'></asp:HyperLink>

Second one "just" doesn't work. It renders text only:
<a id="ctl00_ContentPlaceHolder1_link2">Link2</a>

D.

 

[Dmitry Duginov]

Hi Dmitry,

First one is just an example, just to describe an approach if you need to
use some filed instead of the DataKey.

Are you using a multi fields DataKey? Would you please post your complete
code or send me a complete project?

Nope, it is single-field DataKey. The significant difference between your
code and mine is that my link is outside the FormView (see a new line for
link3). This way is doesn't work.

<asp:HyperLink ID="link1" runat="server" Text="Link"
NavigateUrl='<%# String.Format("~/Carrier/AddNew.aspx?id={0}", Eval("Id"))
%>'></asp:HyperLink>
<br />
<asp:HyperLink ID="link2" runat="server" Text="Link2"
NavigateUrl='<%# String.Format("~/Carrier/AddNew.aspx?id={0}",
FormView1.DataKey.Value) %>'></asp:HyperLink>
</ItemTemplate>
</asp:FormView>
<asp:HyperLink ID="link3" runat="server" Text="Link3"
NavigateUrl='<%# String.Format("~/Carrier/AddNew.aspx?id={0}",
FormView1.DataKey.Value) %>'></asp:HyperLink>

Dmitry

 

[Walter Wang [MSFT]]

Hi Dmitry,

The data binding expression <%# %> must be used inside a control that whose
DataBind() method will be called at run-time, otherwise it will not work.

#
http://msdn2.microsoft.com/en-us/library/ms178366.aspx
<quote>
Data-binding expressions are resolved when the DataBind method of a control
or of the Page class is called. For controls such as the GridView,
DetailsView, and FormView controls, data-binding expressions are resolved
automatically during the control's PreRender event and you are not required
to call the DataBind method explicitly.
</quote>

#Digging Into Data Binding Expressions
http://www.odetocode.com/Articles/278.aspx
<quote>
Under The Covers Of The Data Binding Expression

In order to really understand what happens inside of the data binding
expression, let¡¯s take a look at the code the runtime generates for the
ASPX file.
...
</quote>

Regards,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
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[Walter Wang [MSFT]]

Hi Dmitry,

I'm writing to check the status of this post. Please feel free to let me
know if there's anything else I can help. Thanks.



Regards,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.