How to read web.config APP key settings in HTML markup

asp.net html object web-config activex
Khalid Rahaman picture Khalid Rahaman · Oct 30, 2010 · Viewed 71.1k times · Source

I have an ASP.NET site which uses a 3rd party activeX control. I have to pass a few parameters to the OBJECT tag in the HTML page. If i hardcode these parameters into the HTML everything works.

I would like to place the parameters in my web.config with app settings "key/value" pairs.

My problem is i cannot read the app key setting in the HTML markup to succesfully pass them in as parameters. I can read them fine from server side code behind.

What's the correct way to read these settings in the client side HTML markup ?

Thanks

Answer

Scott Mitchell picture Scott Mitchell · Oct 30, 2010

In addition to using <%=ConfigurationManager.AppSettings["MyAttribute"]%>, as others have noted, you can also use expression builders. The syntax is a little different. Instead of <%=...%> you use <%$ AppSettings: MyAttribute %>, like so:

<object id="myObjectID attr="<%$ AppSettings: MyAttribute %>" ...>

If you are just dumping an appSettings value directly into static HTML (as I presume you are in this example), these two approaches are identical for all practical purposes.

What is nice about expression builders, though, is that you can use them to declaratively assign appSettings values to Web control properties, something you cannot do with the <%=...%> syntax. That is, with expression builders you can do something like:

<asp:Label runat="server" ... Text="<%$ AppSettings: MyAttribute %>" />

Whereas you could not do:

<asp:Label runat="server" ... Text="<%=ConfigurationManager.AppSettings["MyAttribute"]%>" />

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