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API to get the pages directly and indirectly using a page template

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TitleAPI to get the pages directly and indirectly using a page template
URL Nameapi-to-get-the-pages-directly-and-indirectly-using-a-page-template
Article Number000203539
EnvironmentProduct: Sitefinity
Version: 11.x, 12.x,13.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description
A site has a page template, and many templates are built using the page template.
Each template has multiple pages across multiple sites. How to get all the pages associated to the page template  directly or indirectly(having a page template that inherits from the given template)?
Steps to Reproduce
Clarifying Information
Error Message
Defect/Enhancement Number
Cause
There is no out of the box approach for this. A custom code implementation is required for teh same.
Resolution
Attached is a webform that takes the title of the page template and returns a Grid with page title and site that it belongs to upon button click.

Following is the code for the same:
protected void Submit_Click(object sender, EventArgs e)
        {
            PageTemplate pageTemplate = pageManager.GetTemplates().Where(t => t.Title == PageTemplateTB.Text).FirstOrDefault();
            MultisiteContext multisiteContext = SystemManager.CurrentContext as MultisiteContext;
            var siteName = multisiteContext.GetSites().Where(x=>x.IsDefault).FirstOrDefault().Name;
            if (pageTemplate != null)
            {

                pagetemplates.Add(pageTemplate);
                GetChildTemplates(pageTemplate);
                foreach (var t in pagetemplates)
                {
                    GetPagesOfPageTemplate(t);
                }
                this.PagesGrid.DataSource = pages.Select(x=> new PageItem { Title = x.NavigationNode.Title, Site=(x.NavigationNode.RootNode.Name== "FrontendSiteMap"?siteName: x.NavigationNode.RootNode.Name)});
                this.PagesGrid.DataBind();
            }
        }
        
       

        private void GetChildTemplates(PageTemplate template)
        {
            var ct= pageManager.GetTemplates().Where(x => x.ParentTemplate == template);
            pagetemplates.AddRange(ct);
            foreach (var t in ct)
            {
                if (t.ChildTemplates.Count!=0)
                {
                    GetChildTemplates(t);
                }
            }
        }

        private void GetPagesOfPageTemplate(PageTemplate template)
        {
            pages.AddRange(template.Pages().Where(p => p.Status == ContentLifecycleStatus.Live).ToList());
        }

        class PageItem
        {
            public string Title { get; set; }
            public string Site { get; set; }
        }

 
Workaround
Notes
Last Modified Date6/17/2021 2:20 PM
Attachment 
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