Adding Left Navigation for SharePoint Publishing site programmatically

Problem Background

I was working on creating a webtemplate based in SharePoint 2013 based on publishing site. There I had an requirement to create Left Navigation programmatic.

Solution Background

Here I have used "Structural Navigation" as the navigation type.

Solution

Below is the method to achieve it.

           
using (SPSite spSite = new SPSite("http://cd-sjamaldeen:23855/sites/002/"))
{
    using (SPWeb spWeb = spSite.OpenWeb())
    {

        //to remove pages from quick launch navigation
        PublishingWeb publishingWeb = PublishingWeb.GetPublishingWeb(spWeb);
        // Current navigation 
        publishingWeb.Navigation.CurrentIncludePages = false;
        publishingWeb.Navigation.CurrentIncludeSubSites = false;
        publishingWeb.Navigation.GlobalIncludePages = false;
        publishingWeb.Navigation.GlobalIncludeSubSites = false;


        var webNavSettings = new WebNavigationSettings(spWeb);

        // Set the current navigation to Structural Navigation type
        webNavSettings.CurrentNavigation.Source = StandardNavigationSource.PortalProvider;

        // Set the global navigation to Structural Navigation type
        webNavSettings.GlobalNavigation.Source = StandardNavigationSource.PortalProvider;

        webNavSettings.Update();
      

        //add the settings page to the quick launch
        SPNavigationNodeCollection nodeColl = spWeb.Navigation.QuickLaunch;

        //Delete all the navigation nodes from QuickLaunch 
        for (int i = spWeb.Navigation.QuickLaunch.Count - 1; i > -1; i--)
        {
                        
            spWeb.Navigation.QuickLaunch[i].Delete();
        }


        publishingWeb.Update();

        SPNavigationNode googleNode = new SPNavigationNode("Google", "http://google.com");
        nodeColl.AddAsFirst(googleNode);


        SPNavigationNode yahooNode = new SPNavigationNode("Yahoo", "http://yahoo.com");
        nodeColl.AddAsLast(yahooNode);

        spSite.AllowUnsafeUpdates = true;
        spWeb.AllowUnsafeUpdates = true;
        spWeb.Update();
        spWeb.AllowUnsafeUpdates = false;
        spSite.AllowUnsafeUpdates = false;

    }
}
 
 

Conclusion

Hope your publishing site now will have the Navigation.
If you face any problems go to site setting ->  Navigation (Under Look and Feel section) see weather all your navigation setting exists.