Make the page method virtual.

modules/blogging/src/Volo.Blogging.Web/Pages/Admin/Blogs/Create.cshtml.cs

@@ -24,7 +24,7 @@ namespace Volo.Blogging.Pages.Admin.Blogs
             _authorization = authorization;
         }
 
-        public async Task<ActionResult> OnGetAsync()
+        public virtual async Task<ActionResult> OnGetAsync()
         {
             if (!await _authorization.IsGrantedAsync(BloggingPermissions.Blogs.Create))
             {
@@ -34,7 +34,7 @@ namespace Volo.Blogging.Pages.Admin.Blogs
             return Page();
         }
 
-        public async Task<IActionResult> OnPostAsync()
+        public virtual async Task<IActionResult> OnPostAsync()
         {
             var blogDto = ObjectMapper.Map<BlogCreateModalView, CreateBlogDto>(Blog);
 

modules/blogging/src/Volo.Blogging.Web/Pages/Admin/Blogs/Edit.cshtml.cs

@@ -29,7 +29,7 @@ namespace Volo.Blogging.Pages.Admin.Blogs
             _authorization = authorization;
         }
 
-        public async Task<ActionResult> OnGetAsync()
+        public virtual async Task<ActionResult> OnGetAsync()
         {
             if (!await _authorization.IsGrantedAsync(BloggingPermissions.Blogs.Update))
             {
@@ -43,7 +43,7 @@ namespace Volo.Blogging.Pages.Admin.Blogs
             return Page();
         }
 
-        public async Task<IActionResult> OnPostAsync()
+        public virtual async Task<IActionResult> OnPostAsync()
         {
             await _blogAppService.Update(Blog.Id, new UpdateBlogDto()
             {

modules/blogging/src/Volo.Blogging.Web/Pages/Admin/Blogs/Index.cshtml.cs

@@ -15,7 +15,7 @@ namespace Volo.Blogging.Pages.Admin.Blogs
             _authorization = authorization;
         }
 
-        public async Task<ActionResult> OnGetAsync()
+        public virtual async Task<ActionResult> OnGetAsync()
         {
             if (!await _authorization.IsGrantedAsync(BloggingPermissions.Blogs.Management))
             {

modules/blogging/src/Volo.Blogging.Web/Pages/Blogs/Index.cshtml.cs

@@ -19,7 +19,7 @@ namespace Volo.Blogging.Pages.Blog
             _blogAppService = blogAppService;
         }
 
-        public async Task<IActionResult> OnGetAsync()
+        public virtual async Task<IActionResult> OnGetAsync()
         {
             var result = await _blogAppService.GetListAsync();
 

modules/blogging/src/Volo.Blogging.Web/Pages/Blogs/Posts/Detail.cshtml.cs

@@ -46,14 +46,14 @@ namespace Volo.Blogging.Pages.Blog.Posts
             _commentAppService = commentAppService;
         }
 
-        public async Task<IActionResult> OnGetAsync()
+        public virtual async Task<IActionResult> OnGetAsync()
         {
             await GetData();
 
             return Page();
         }
 
-        public async Task<IActionResult> OnPostAsync()
+        public virtual async Task<IActionResult> OnPostAsync()
         {
             var comment = await _commentAppService.CreateAsync(new CreateCommentDto()
             {

modules/blogging/src/Volo.Blogging.Web/Pages/Blogs/Posts/Edit.cshtml.cs

@@ -33,7 +33,7 @@ namespace Volo.Blogging.Pages.Blog.Posts
             _authorization = authorization;
         }
 
-        public async Task<ActionResult> OnGetAsync()
+        public virtual async Task<ActionResult> OnGetAsync()
         {
             if (!await _authorization.IsGrantedAsync(BloggingPermissions.Posts.Update))
             {
@@ -47,7 +47,7 @@ namespace Volo.Blogging.Pages.Blog.Posts
             return Page();
         }
 
-        public async Task<ActionResult> OnPostAsync()
+        public virtual async Task<ActionResult> OnPostAsync()
         {
             var post = new UpdatePostDto
             {

modules/blogging/src/Volo.Blogging.Web/Pages/Blogs/Posts/Index.cshtml.cs

@@ -35,7 +35,7 @@ namespace Volo.Blogging.Pages.Blog.Posts
             _tagAppService = tagAppService;
         }
 
-        public async Task<ActionResult> OnGetAsync()
+        public virtual async Task<ActionResult> OnGetAsync()
         {
             Blog = await _blogAppService.GetByShortNameAsync(BlogShortName);
             Posts = (await _postAppService.GetListByBlogIdAndTagName(Blog.Id, TagName)).Items;

modules/blogging/src/Volo.Blogging.Web/Pages/Blogs/Posts/New.cshtml.cs

@@ -35,7 +35,7 @@ namespace Volo.Blogging.Pages.Blog.Posts
             _blogOptions = blogOptions.Value;
         }
 
-        public async Task<ActionResult> OnGetAsync()
+        public virtual async Task<ActionResult> OnGetAsync()
         {
             if (!await _authorization.IsGrantedAsync(BloggingPermissions.Posts.Create))
             {
@@ -51,7 +51,7 @@ namespace Volo.Blogging.Pages.Blog.Posts
             return Page();
         }
 
-        public async Task<ActionResult> OnPost()
+        public virtual async Task<ActionResult> OnPost()
         {
             var blog = await _blogAppService.GetAsync(Post.BlogId);
 

modules/client-simulation/src/Volo.ClientSimulation.Web/Pages/ClientSimulation/Index.cshtml.cs

@@ -6,7 +6,7 @@ namespace Volo.ClientSimulation.Pages.ClientSimulation
 {
     public class IndexModel : PageModel
     {
-        public Task<IActionResult> OnGetAsync()
+        public virtual Task<IActionResult> OnGetAsync()
         {
             return Task.FromResult<IActionResult>(Page());
         }

modules/client-simulation/src/Volo.ClientSimulation.Web/Pages/ClientSimulation/SimulationArea.cshtml.cs

@@ -16,19 +16,19 @@ namespace Volo.ClientSimulation.Pages.ClientSimulation
             Simulation = simulation;
         }
 
-        public Task<IActionResult> OnGetAsync()
+        public virtual Task<IActionResult> OnGetAsync()
         {
             Snapshot = Simulation.CreateSnapshot();
             return Task.FromResult<IActionResult>(Page());
         }
 
-        public async Task<IActionResult> OnPostStartAsync()
+        public virtual async Task<IActionResult> OnPostStartAsync()
         {
             Simulation.Start();
             return new NoContentResult();
         }
 
-        public async Task<IActionResult> OnPostStopAsync()
+        public virtual async Task<IActionResult> OnPostStopAsync()
         {
             Simulation.Stop();
             return new NoContentResult();

modules/docs/app/VoloDocs.Web/Pages/Index.cshtml.cs

@@ -24,7 +24,7 @@ namespace VoloDocs.Web.Pages
             _urlUiOptions = urlOptions.Value;
         }
 
-        public async Task<IActionResult> OnGetAsync()
+        public virtual async Task<IActionResult> OnGetAsync()
         {
             var projects = await _projectAppService.GetListAsync();
 

modules/docs/src/Volo.Docs.Admin.Web/Pages/Docs/Admin/Projects/Create.cshtml.cs

@@ -29,7 +29,7 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
             _projectAppService = projectAppService;
         }
 
-        public async Task<ActionResult> OnGetAsync(string source)
+        public virtual async Task<ActionResult> OnGetAsync(string source)
         {
             if (source != null && source.ToLowerInvariant() == "github")
             {
@@ -42,7 +42,7 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
             }
         }
 
-        public async Task<IActionResult> OnPostAsync()
+        public virtual async Task<IActionResult> OnPostAsync()
         {
             if (GithubProject != null)
             {

modules/docs/src/Volo.Docs.Admin.Web/Pages/Docs/Admin/Projects/Edit.cshtml.cs

@@ -29,7 +29,7 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
             _projectAppService = projectAppService;
         }
 
-        public async Task<ActionResult> OnGetAsync(Guid id)
+        public virtual async Task<ActionResult> OnGetAsync(Guid id)
         {
             var project = await _projectAppService.GetAsync(id);
 
@@ -42,7 +42,7 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
             throw new BusinessException("UnknowDocumentSourceExceptionMessage");
         }
 
-        public async Task<IActionResult> OnPostAsync()
+        public virtual async Task<IActionResult> OnPostAsync()
         {
             if (GithubProject != null)
             {

modules/docs/src/Volo.Docs.Admin.Web/Pages/Docs/Admin/Projects/Index.cshtml.cs

@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Volo.Abp.AspNetCore.Mvc.UI.RazorPages;
@@ -7,9 +8,9 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
     [Authorize(DocsAdminPermissions.Projects.Default)]
     public class IndexModel : DocsAdminPageModel
     {
-        public ActionResult OnGet()
+        public virtual Task<IActionResult> OnGet()
         {
-            return Page();
+            return Task.FromResult<IActionResult>(Page());
         }
     }
 }

modules/docs/src/Volo.Docs.Admin.Web/Pages/Docs/Admin/Projects/Pull.cshtml.cs

@@ -23,7 +23,7 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
             _documentAppService = documentAppService;
         }
 
-        public async Task<ActionResult> OnGetAsync(Guid id)
+        public virtual async Task<ActionResult> OnGetAsync(Guid id)
         {
             var project = await _projectAppService.GetAsync(id);
 
@@ -36,7 +36,7 @@ namespace Volo.Docs.Admin.Pages.Docs.Admin.Projects
             return Page();
         }
 
-        public async Task<IActionResult> OnPostAsync()
+        public virtual async Task<IActionResult> OnPostAsync()
         {
             if (PullDocument.All)
             {

modules/docs/src/Volo.Docs.Web/Pages/Documents/Index.cshtml.cs

@@ -25,7 +25,7 @@ namespace Volo.Docs.Pages.Documents
             _uiOptions = urlOptions.Value;
         }
 
-        public async Task<IActionResult> OnGetAsync()
+        public virtual async Task<IActionResult> OnGetAsync()
         {
             DocumentsUrlPrefix = _uiOptions.RoutePrefix;
 

modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml.cs

@@ -92,7 +92,7 @@ namespace Volo.Docs.Pages.Documents.Project
             _uiOptions = options.Value;
         }
 
-        public async Task<IActionResult> OnGetAsync()
+        public virtual async Task<IActionResult> OnGetAsync()
         {
             try
             {

modules/docs/src/Volo.Docs.Web/Pages/Documents/Search.cshtml.cs

@@ -39,7 +39,7 @@ namespace Volo.Docs.Pages.Documents
 
         public List<DocumentSearchOutput> SearchOutputs { get; set; } = new List<DocumentSearchOutput>();
 
-        public async Task<IActionResult> OnGetAsync(string keyword)
+        public virtual async Task<IActionResult> OnGetAsync(string keyword)
         {
             if (!await _documentAppService.FullSearchEnabledAsync())
             {