changing web.config for azure app fabric settings

Question

Hi,

 

We are using app fabric cache and it works great with the values in web.config.

 

I want to change the settting after reading from service config. I thought of putting some code in role start up which reads from service config and updates the values in web.config something like this:

 

using (var server = new ServerManager()) 

   { 

       // get the site's web configuration 

          var siteNameFromServiceModel = "Web"; //this is from from service def

          var siteName = 

          string.Format("{0}_{1}", RoleEnvironment.CurrentRoleInstance.Id, siteNameFromServiceModel); 

          var siteConfig = server.Sites[siteName].GetWebConfiguration();

        //var appSettings = siteConfig.GetSection("dataCacheClient").GetCollection(); 

         //   var section = siteConfig.GetSection("configuration/dataCacheClient");

//update the values somehow

        server.CommitChanges(); 

   } 

 

I get the following error when I try to read the datacacheclient section which is d

Error: The configuration section 'dataCacheClient' cannot be read because it is missing schema.

 

Has someone done anything similar? Or is there any other way to handle it. I want to change it because this setting would be different from dev/test/uat/prod…

 

Any pointers?

 

Manish

Answer 1

Hi Manish,

Andy Cross has written about how to Modify the web.config on WebRole Start.

However, I think your scenario is rather different than what he has outlined.

Your issue is rather similar to this thread.

I hope this helps

 

~Cory

---

Cory Fowler Windows Azure MVP http://blog.syntaxc4.net

Answer 2

is there anyone who has dnoe something similar. basically you aer right. My problem is similar to  the thread you are mentioning but i dont think there is a soln for it in that thread.

Answer 3

Hello Manish,

You want to modify the web.config file in role start.

Instead of using Configuration class to manipulate the configuration file, you can also use Ling to Xml to implement this. Please refer to the following code sample:

    public override bool OnStart()
    {
        using (var server = new ServerManager())
        {
            var siteNameFromServiceModel = "Web"; //this is from from service def
            var siteName = string.Format("{0}_{1}", RoleEnvironment.CurrentRoleInstance.Id, siteNameFromServiceModel);
            string configFilePath = server.Sites[siteName].Applications[0].VirtualDirectories[0].PhysicalPath + "Web.config";

            XElement element = XElement.Load(configFilePath);
            element.Element("dataCacheClient").Element("hosts").Element("host").Attribute("name").Value = "my host";
            element.Element("dataCacheClient").Element("securityProperties").Element("messageSecurity").Attribute("authorizationInfo").Value = "my authorization information";
            element.Save(configFilePath);
        } 

        return base.OnStart();
    }

If you need further assistance, please let me know.

Thanks,

---

Wengchao Zeng
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Answer 4

The question was how to avoid exception and make the Web.Administration work.
Thanks that you didn't suggest open a config as a text file and parse it.

PS. There's a problem with you approach is that section may be in a different file and I was hopping that Web.Administration can help with that.