Fix issue with umbracoRedirect and dtgePreview

Hook into the request pipeline to stop redirects for DTGE preview requests

Author: TomSteer

src/Our.Umbraco.DocTypeGridEditor/Bootstrap.cs

@@ -5,6 +5,7 @@
 using Umbraco.Core.Events;
 using Umbraco.Core.Models;
 using Umbraco.Core.Services;
+using Umbraco.Web.Routing;
 
 namespace Our.Umbraco.DocTypeGridEditor
 {
@@ -24,6 +25,18 @@ protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplica
         {
             DataTypeService.Saved += ExpireDataTypeCache;
             ContentTypeService.SavedContentType += ExpireContentTypeCache;
+            PublishedContentRequest.Prepared += PublishedContentRequest_Prepared;
+        }
+        
+        private void PublishedContentRequest_Prepared(object sender, EventArgs e)
+        {
+            var request = sender as PublishedContentRequest;
+            // Check if it's a dtgePreview request and is set to redirect.
+            // If so reset the redirect url to an empty string to stop the redirect happening in preview mode.
+            if (request.Uri.Query.Contains("dtgePreview") && request.IsRedirect)
+            {
+                request.SetRedirect(string.Empty);
+            }
         }
 
         private void ExpireDataTypeCache(IDataTypeService sender, SaveEventArgs<IDataTypeDefinition> e)