Application/AddLink.cs

@@ -5,6 +5,7 @@ using HN.Domain;
 using MediatR;
 
 namespace HN.Application {
+
     public class AddLinkCommand : IRequest<Guid>
     {
         public string Url { get; set; }
@@ -21,11 +22,12 @@ namespace HN.Application {
 
         public async Task<Guid> Handle(AddLinkCommand request, CancellationToken cancellationToken)
         {
-            var link = new Link(request.Url);
+            var link = Link.FromUrl(request.Url);
 
             await this._repository.AddAsync(link);
 
             return link.Id;
         }
     }
+    
 }

Domain/Link.cs

@@ -8,11 +8,16 @@ namespace HN.Domain
         public string Url { get; }
         public DateTime CreatedAt { get; }
 
-        public Link(string url)
+        private Link(string url)
         {
             this.Id = Guid.NewGuid();
             this.CreatedAt = DateTime.UtcNow;
             this.Url = url;
         }
+
+        public static Link FromUrl(string url)
+        {
+            return new Link(url);
+        }
     }
 }