Check NullOrEmpty for sortings instead of null coalescing in CmsKit

modules/cms-kit/src/Volo.CmsKit.EntityFrameworkCore/Volo/CmsKit/Blogs/EfCoreBlogPostRepository.cs

@@ -68,7 +68,7 @@ namespace Volo.CmsKit.Blogs
                 .WhereIf(blogId.HasValue, x => x.BlogId == blogId)
                 .WhereIf(!string.IsNullOrWhiteSpace(filter), x => x.Title.Contains(filter) || x.Slug.Contains(filter));
 
-            queryable = queryable.OrderBy(sorting ?? $"{nameof(BlogPost.CreationTime)} desc");
+            queryable = queryable.OrderBy(sorting.IsNullOrEmpty() ? $"{nameof(BlogPost.CreationTime)} desc" : sorting);
             
             var combinedResult = await queryable
                 .Join(

modules/cms-kit/src/Volo.CmsKit.EntityFrameworkCore/Volo/CmsKit/Blogs/EfCoreBlogRepository.cs

@@ -38,7 +38,7 @@ namespace Volo.CmsKit.Blogs
         {
             var query = await GetListQueryAsync(filter);
 
-            return await query.OrderBy(sorting ?? "creationTime desc")
+            return await query.OrderBy(sorting.IsNullOrEmpty() ? "creationTime desc" : sorting)
                               .PageBy(skipCount, maxResultCount)
                               .ToListAsync(GetCancellationToken(cancellationToken));
         }

modules/cms-kit/src/Volo.CmsKit.EntityFrameworkCore/Volo/CmsKit/Comments/EfCoreCommentRepository.cs

@@ -74,7 +74,7 @@ namespace Volo.CmsKit.Comments
                 sorting = "comment." + sorting;
             }
 
-            query = query.OrderBy(sorting ?? "comment.creationTime desc")
+            query = query.OrderBy(sorting.IsNullOrEmpty() ? "comment.creationTime desc" : sorting)
                 .PageBy(skipCount, maxResultCount);
 
             return await query.ToListAsync(token);

modules/cms-kit/src/Volo.CmsKit.EntityFrameworkCore/Volo/CmsKit/Pages/EfCorePageRepository.cs

@@ -40,7 +40,7 @@ namespace Volo.CmsKit.Pages
                     !filter.IsNullOrWhiteSpace(),
                     x =>
                         x.Title.Contains(filter))
-                .OrderBy(sorting ?? nameof(Page.Title))
+                .OrderBy(sorting.IsNullOrEmpty() ? nameof(Page.Title) : sorting)
                 .PageBy(skipCount, maxResultCount)
                 .ToListAsync(GetCancellationToken(cancellationToken));
         }

modules/cms-kit/src/Volo.CmsKit.MongoDB/Volo/CmsKit/MongoDB/Blogs/MongoBlogPostRepository.cs

@@ -71,7 +71,7 @@ namespace Volo.CmsKit.MongoDB.Blogs
                 .WhereIf(blogId.HasValue, x => x.BlogId == blogId)
                 .WhereIf(!string.IsNullOrWhiteSpace(filter), x => x.Title.Contains(filter) || x.Slug.Contains(filter));
 
-            queryable = queryable.OrderBy(sorting ?? $"{nameof(BlogPost.CreationTime)} desc");
+            queryable = queryable.OrderBy(sorting.IsNullOrEmpty() ? $"{nameof(BlogPost.CreationTime)} desc" : sorting);
 
             var combinedQueryable = queryable
                                     .Join(

modules/cms-kit/src/Volo.CmsKit.MongoDB/Volo/CmsKit/MongoDB/Blogs/MongoBlogRepository.cs

@@ -43,7 +43,7 @@ namespace Volo.CmsKit.MongoDB.Blogs
             
             var query = await GetListQueryAsync(filter, token);
             
-            return await query.OrderBy(sorting ?? "creationTime desc")
+            return await query.OrderBy(sorting.IsNullOrEmpty() ? "creationTime desc" : sorting)
                       .As<IMongoQueryable<Blog>>()
                       .PageBy<Blog, IMongoQueryable<Blog>>(skipCount, maxResultCount)
                       .ToListAsync(token);

modules/cms-kit/src/Volo.CmsKit.MongoDB/Volo/CmsKit/MongoDB/Comments/MongoCommentRepository.cs

@@ -67,7 +67,7 @@ namespace Volo.CmsKit.MongoDB.Comments
                 creationEndDate, 
                 token);
 
-            var comments = await query.OrderBy(sorting ?? "creationTime desc")
+            var comments = await query.OrderBy(sorting.IsNullOrEmpty() ? "creationTime desc" : sorting)
                 .As<IMongoQueryable<Comment>>()
                 .PageBy<Comment, IMongoQueryable<Comment>>(skipCount, maxResultCount)
                 .ToListAsync(token);

modules/cms-kit/src/Volo.CmsKit.MongoDB/Volo/CmsKit/MongoDB/Pages/MongoPageRepository.cs

@@ -49,7 +49,7 @@ namespace Volo.CmsKit.MongoDB.Pages
                     u =>
                         u.Title.Contains(filter)
                 )
-                .OrderBy(sorting ?? nameof(Page.Title))
+                .OrderBy(sorting.IsNullOrEmpty() ? nameof(Page.Title) : sorting)
                 .As<IMongoQueryable<Page>>()
                 .PageBy<Page, IMongoQueryable<Page>>(skipCount, maxResultCount)
                 .ToListAsync(cancellation);