How to use a variable set at build time in asp files

Question

My application has to use a CDN in production. We don't want to use the same CDN in development and production. How and where can I define a property "CDN_URL" for each build profile so that it is substituted at buid time or retrieved dynamically at runtime.

I'd like to write something like:

<link rel="stylesheet" type="text/css" href="${CDN_URL}/styles/base.css" />

What version of ASP.NET are you using? Web Forms? MVC? Where do you save the property? — Patrick Hofman, Sep 30 '14 at 09:58
We use .NET Framework 4.5. Today we don't use any property at all and we don't have any constraint. — mvera, Sep 30 '14 at 12:10

score 2 · Accepted Answer · edited May 23 '17 at 10:33

2

You will want to store the CDN URL in the app settings in the web.config.

For example:

<appSettings>
    <add key="Live_CDNURL" value="http://live.cdn.com"/>
    <add key="Development_CDNURL" value="http://dev.cdn.com"/>
</appSettings>

Then in the application you can use:

 WebConfigurationManager.AppSettings["Live_CDNURL"];

Then simply add the stylesheet using asp following something like Adding StyleSheets Programmatically in Asp.Net

Or do:

<link rel="stylesheet" type="text/css" href="<%=ConfigurationManager.AppSettings("Live_CDNURL")%>/styles/base.css" />

edited May 23 '17 at 10:33

Community

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answered Sep 30 '14 at 10:28

Ryan McDonough

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thanks you explained me how to use a property from web.config in an ASP page. But how can I use a single property "CDNURL" and change its value depending on my deployment platform ? – mvera Sep 30 '14 at 12:16
Well you can store just CDNURL in the web.config - you will have on web.config used in dev and a separate web.config used in live. – Ryan McDonough Sep 30 '14 at 14:21

How to use a variable set at build time in asp files

1 Answers1