make Title and Url setters protected and expose Set method to handle validation.

modules/cms-kit/src/Volo.CmsKit.Admin.Application/Volo/CmsKit/Admin/Pages/PageAdminAppService.cs

@@ -66,8 +66,8 @@ namespace Volo.CmsKit.Admin.Pages
                 await CheckPageUrlAsync(input.Url);
             }
 
-            page.Title = input.Title;
-            page.Url = input.Url;
+            page.SetTitle(input.Title);
+            page.SetUrl(input.Url);
             page.Description = input.Description;
 
             await PageRepository.UpdateAsync(page);

modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/Pages/Page.cs

@@ -8,26 +8,36 @@ namespace Volo.CmsKit.Pages
 {
     public class Page : FullAuditedAggregateRoot<Guid>, IMultiTenant
     {
-        public Guid? TenantId { get; set; }
+        [CanBeNull] public virtual Guid? TenantId { get; set; }
 
-        public virtual string Title { get; set; }
+        [NotNull] public virtual string Title { get; protected set; }
+
+        [NotNull] public virtual string Url { get; protected set; }
+
+        [CanBeNull] public virtual string Description { get; set; }
 
-        public virtual string Url { get; set; }
-        
-        public virtual string Description { get; set; }
-        
         protected Page()
         {
-            
         }
 
-        public Page(Guid id, [NotNull] string title, [NotNull] string url, [CanBeNull] string description = null, Guid? tenantId = null) : base(id)
+        public Page(Guid id, [NotNull] string title, [NotNull] string url, [CanBeNull] string description = null,
+            Guid? tenantId = null) : base(id)
         {
-            Title = Check.NotNullOrWhiteSpace(title, nameof(title), PageConsts.MaxTitleLength);
-            Url = Check.NotNullOrWhiteSpace(url, nameof(url), PageConsts.MaxUrlLength);
+            Title = Check.NotNullOrEmpty(title, nameof(title), PageConsts.MaxTitleLength);
+            Url = Check.NotNullOrEmpty(url, nameof(url), PageConsts.MaxUrlLength);
             Description = Check.Length(description, nameof(description), PageConsts.MaxDescriptionLength);
-            
+
             TenantId = tenantId;
         }
+
+        public virtual void SetTitle(string title)
+        {
+            Title = Check.NotNullOrEmpty(title, nameof(title), PageConsts.MaxTitleLength);
+        }
+
+        public virtual void SetUrl(string url)
+        {
+            Url = Check.NotNullOrEmpty(url, nameof(url), PageConsts.MaxUrlLength);
+        }
     }
 }