Outputting XML from an API controller has changed a bit from ASP.NET …

…to ASP.NET Core

src/Limbo.Umbraco.Seo/Sitemaps/SitemapController.cs

@@ -1,5 +1,6 @@
-using System.Net.Http;
-using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc;
+using System.IO;
+using System.Text;
 using Umbraco.Cms.Web.Common.Controllers;
 
 namespace Limbo.Umbraco.Seo.Sitemaps {
@@ -13,8 +14,25 @@ public SitemapController(ISitemapHelper sitemapHelper) {
         }
 
         [HttpGet]
-        public HttpResponseMessage XmlSitemap() {
-            return _sitemapHelper.BuildSitemap(HttpContext).AsResponseMessage();
+        public ActionResult XmlSitemap() {
+
+            // Generate a new sitemap
+            ISitemapResult sitemap = _sitemapHelper.BuildSitemap(HttpContext);
+
+            // Generate the XML for the sitemap
+            StringBuilder builder = new StringBuilder();
+            using (TextWriter writer = new StringWriter(builder)) {
+                sitemap.ToXml().Save(writer);
+            }
+
+            // Return a content result with the XML
+            return new ContentResult {
+                ContentType = "application/xml",
+                Content = builder.ToString(),
+                StatusCode = 200
+            };
+
+
         }
 
     }