refactoring

modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Blogs/BlogAppService.cs

@@ -32,6 +32,11 @@ namespace Volo.Blogging.Blogs
             Check.NotNullOrWhiteSpace(shortName, nameof(shortName));
 
             var blog = await BlogRepository.FindByShortNameAsync(shortName);
+            
+            if (blog == null)
+            {
+                throw new EntityNotFoundException(typeof(Blog), shortName);
+            }
 
             return ObjectMapper.Map<Blog, BlogDto>(blog);
         }

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

@@ -1,7 +1,9 @@
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Volo.Abp.AspNetCore.Mvc.UI.RazorPages;
+using Volo.Abp.Domain.Entities;
 using Volo.Blogging.Blogs;
 using Volo.Blogging.Blogs.Dtos;
 using Volo.Blogging.Pages.Blogs.Shared.Helpers;
@@ -43,11 +45,13 @@ namespace Volo.Blogging.Pages.Blog.Posts
                 return NotFound();
             }
 
-            Blog = await _blogAppService.GetByShortNameAsync(BlogShortName);
-            
-            if (Blog == null)
+            try
             {
-               return RedirectToPage("/Blogs/Index");
+                Blog = await _blogAppService.GetByShortNameAsync(BlogShortName);
+            }
+            catch (EntityNotFoundException)
+            { 
+                return RedirectToPage("/Blogs/Index");
             }
             
             Posts = (await _postAppService.GetListByBlogIdAndTagNameAsync(Blog.Id, TagName)).Items;