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24Nov/091

Adding CDN Functionality to ASP.net MVC

I bet everyone develop webpage today are most likely to use a CDN for deliver images, video. Unlike in rails, MVC does not have a way to link with CDN, so i write this extension for your HtmlHelper so that you can easily link to a CDN that preconfig in your Web.config

First, we need to add the ff. to web.config

<appsettings>
      <add key="cdn" value="cdn.ducdigital.com, cn.ducdigital.com" />
  </appsettings>

and then use the ff class:

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public static class CDNHelperExtension
{
 
    public static string CDNLink(this HtmlHelper html, string path)
    {
        string[] CDN = ConfigurationSettings.AppSettings["cdn"].Replace(" ", "").Split(',');
        Random r = new Random();
        return CDNLink(html, path, r.Next(0, CDN.Count()));
    }
 
    public static string CDNLink(this HtmlHelper html, string path, int ServerNumber)
    {
        string[] CDN = ConfigurationSettings.AppSettings["cdn"].Replace(" ", "").Split(',');
        if (ServerNumber >= CDN.Count())
            ServerNumber = 0;
        return "http://" + CDN[ServerNumber] + path;
    }
}

in your View, just call:

< %= Html.CDNLink("/images/") %>

Good luck!

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