Server tags cannot contain <% ... %> constructs

[Marcos MOS]

Hi,

I've put a appSetting tag into my web.config, but when I try to catch its
value to my Image WebControl occurs the follow error: "Server tags cannot
contain <% ... %> constructs."

on myPage.aspx (Notice the ImageUrl tag):
<asp:Image id="Image1" runat="server"
ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi
stema"]%> />

So, What's wrong with my ImageUrl attribution?
Is there any way to do that?

thanks a lot
Marcos

[Sharon]

you can set this property programmatically within a server script block:
Image1.ImageUrl =
System.Configuration.ConfigurationSettings.AppSett ings.....
you cannot use <%%> inside a web control as web controls already run at the
server.
sharon.

"Marcos MOS" <ma***********@softway.com.br> wrote in message
news:ul**************@TK2MSFTNGP12.phx.gbl...

Hi,

I've put a appSetting tag into my web.config, but when I try to catch its
value to my Image WebControl occurs the follow error: "Server tags cannot
contain <% ... %> constructs."

on myPage.aspx (Notice the ImageUrl tag):
<asp:Image id="Image1" runat="server"
ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi stema"]%> />

So, What's wrong with my ImageUrl attribution?
Is there any way to do that?

thanks a lot
Marcos

[Marcos MOS]

Thanks... but, I'd like to do it inside my .aspx file...

Isn't it possible?

tanks
Marcos

"Sharon" <ta*******@hotmail.com> escreveu na mensagem
news:Ov**************@TK2MSFTNGP10.phx.gbl...

you can set this property programmatically within a server script block:
Image1.ImageUrl =
System.Configuration.ConfigurationSettings.AppSett ings.....
you cannot use <%%> inside a web control as web controls already run at the server.
sharon.

"Marcos MOS" <ma***********@softway.com.br> wrote in message
news:ul**************@TK2MSFTNGP12.phx.gbl...

Hi,

I've put a appSetting tag into my web.config, but when I try to catch its value to my Image WebControl occurs the follow error: "Server tags cannot contain <% ... %> constructs."

on myPage.aspx (Notice the ImageUrl tag):
<asp:Image id="Image1" runat="server"

ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi

stema"]%> />

So, What's wrong with my ImageUrl attribution?
Is there any way to do that?

thanks a lot
Marcos

[Sharon]

i don't know of any way, and there is no reason to do it inside the html
section.
one of the ideas behind web controls design, is the separation of code from
html.

"Marcos MOS" <ma***********@softway.com.br> wrote in message
news:e0*************@TK2MSFTNGP11.phx.gbl...

Thanks... but, I'd like to do it inside my .aspx file...

Isn't it possible?

tanks
Marcos

"Sharon" <ta*******@hotmail.com> escreveu na mensagem
news:Ov**************@TK2MSFTNGP10.phx.gbl...

you can set this property programmatically within a server script block:
Image1.ImageUrl =
System.Configuration.ConfigurationSettings.AppSett ings.....
you cannot use <%%> inside a web control as web controls already run at

the

server.
sharon.

"Marcos MOS" <ma***********@softway.com.br> wrote in message
news:ul**************@TK2MSFTNGP12.phx.gbl...

Hi,

I've put a appSetting tag into my web.config, but when I try to catch its value to my Image WebControl occurs the follow error: "Server tags cannot contain <% ... %> constructs."

on myPage.aspx (Notice the ImageUrl tag):
<asp:Image id="Image1" runat="server"

ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi

stema"]%> />

So, What's wrong with my ImageUrl attribution?
Is there any way to do that?

thanks a lot
Marcos

[bruce barker]

use the binding syntax <%# bindingexpression %>

-- bruce (sqlwork.com)
"Marcos MOS" <ma***********@softway.com.br> wrote in message
news:ul**************@TK2MSFTNGP12.phx.gbl...

Hi,

I've put a appSetting tag into my web.config, but when I try to catch its
value to my Image WebControl occurs the follow error: "Server tags cannot
contain <% ... %> constructs."

on myPage.aspx (Notice the ImageUrl tag):
<asp:Image id="Image1" runat="server"
ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi stema"]%> />

So, What's wrong with my ImageUrl attribution?
Is there any way to do that?

thanks a lot
Marcos

[Bruno Sirianni]

In your code there are some errors :

The <%= construct can only be used in client script for write some value
from server (like old ASP).
your Image is server side not in client side!!!!

You can use the <%# construct. This is for binding value!
<asp:Image id="Image1" runat="server"
ImageUrl='<%#System.Configuration.ConfigurationSet tings.AppSettings["SrcImgS
istema"]%>' />

this code require a DataBind() method call!!!

Brun
"Marcos MOS" <ma***********@softway.com.br> wrote in message
news:ul**************@TK2MSFTNGP12.phx.gbl...

Hi,

I've put a appSetting tag into my web.config, but when I try to catch its
value to my Image WebControl occurs the follow error: "Server tags cannot
contain <% ... %> constructs."

on myPage.aspx (Notice the ImageUrl tag):
<asp:Image id="Image1" runat="server"
ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi stema"]%> />

So, What's wrong with my ImageUrl attribution?
Is there any way to do that?

thanks a lot
Marcos

[InfintiesLoop]

In your code there are some errors :

The <%= construct can only be used in client script for write some value
from server (like old ASP).
your Image is server side not in client side!!!!

You can use the <%# construct. This is for binding value!
<asp:Image id="Image1" runat="server"
ImageUrl='<%#System.Configuration.ConfigurationSet tings.AppSettings["SrcImgS
istema"]%>' />

this code require a DataBind() method call!!!

Brun


"Marcos MOS" <[e-mail]> wrote in message
news:[e-mail]...[color=blue]
> Hi,
>
> I've put a appSetting tag into my web.config, but when I try to catch its
> value to my Image WebControl occurs the follow error: "Server tags cannot
> contain <% ... %> constructs."
>
> on myPage.aspx (Notice the ImageUrl tag):
> <asp:Image id="Image1" runat="server"
>[/color]
ImageUrl=<%=System.Configuration.ConfigurationSett ings.AppSettings["SrcImgSi[color=blue]
> stema"]%> />
>
> So, What's wrong with my ImageUrl attribution?
> Is there any way to do that?
>
> thanks a lot
> Marcos
>
>[/color]

In ASP.NET 2.0 not only can you refer to appSettings declaratively (without using the DataBinding syntax), which is precisely what you are trying to do here, but you can create an ExpressionBuilder that lets you run arbitrary code declaratively, which is precisely what you tried to do. Check it out here: http://infinitiesloop.blogspot.com/