WCF Azure Silverlight Calculator

This sample creates a simple WCF calculator service and builds a Silverlight client for it. The client is then hosted alonside the service in the Azure fabric.

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using System.Linq;
using Microsoft.WindowsAzure.Diagnostics;
using Microsoft.WindowsAzure.ServiceRuntime;
using Microsoft.WindowsAzure;

namespace WcfSamples
    public class WebRole : RoleEntryPoint
        public override bool OnStart()

            // For information on handling configuration changes
            // see the MSDN topic at http://go.microsoft.com/fwlink/?LinkId=166357.
            RoleEnvironment.Changing += RoleEnvironmentChanging;

            #region Setup CloudStorageAccount Configuration Setting Publisher

            // This code sets up a handler to update CloudStorageAccount instances when their corresponding
            // configuration settings change in the service configuration file.
            CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>
                // Provide the configSetter with the initial value

                RoleEnvironment.Changed += (sender, arg) =>
                    if (arg.Changes.OfType<RoleEnvironmentConfigurationSettingChange>()
                        .Any((change) => (change.ConfigurationSettingName == configName)))
                        // The corresponding configuration setting has changed, propagate the value
                        if (!configSetter(RoleEnvironment.GetConfigurationSettingValue(configName)))
                            // In this case, the change to the storage account credentials in the
                            // service configuration is significant enough that the role needs to be
                            // recycled in order to use the latest settings. (for example, the 
                            // endpoint has changed)

            return base.OnStart();

        private void RoleEnvironmentChanging(object sender, RoleEnvironmentChangingEventArgs e)
            // If a configuration setting is changing
            if (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange))
                // Set e.Cancel to true to restart this role instance
                e.Cancel = true;