last ...

Providers/XGuidKeyGenerator.cs

@@ -11,7 +11,7 @@ namespace xDataService.Providers
     /// Default Guid Key Generator ...
     /// </summary>
     /// <typeparam name="TEntity"></typeparam>
-    public class XGuidKeyGenerator<TEntity> : IXKeyGenerator<TEntity, Guid>
+    public class XGuidKeyGenerator<TEntity> : XKeyGenerator<TEntity, Guid>, IXKeyGenerator<TEntity, Guid>
     where TEntity : XBaseEntity<Guid>
     {
         private readonly IXSequentialGuid sequentialGuid;
@@ -23,7 +23,7 @@ namespace xDataService.Providers
             this.sequentialGuid = sequentialGuid;
         }
 
-        public async Task<Guid> GenerateKey(
+        public override async Task<Guid> GenerateKey(
             IXBaseRepository<TEntity, Guid> repository,
             CancellationToken cancellationToken = default
         )
@@ -44,7 +44,7 @@ namespace xDataService.Providers
             }, cancellationToken: cancellationToken);
         }
 
-        public bool IsEmpty(Guid id)
+        public override bool IsEmpty(Guid id)
         {
             //
             var result = id.IsNull() || id.IsDefaultGuid();

Providers/XIntKeyGenerator.cs

@@ -12,10 +12,10 @@ namespace xDataService.Providers
     /// Default Int Key Generator ...
     /// </summary>
     /// <typeparam name="TEntity"></typeparam>
-    public class XIntKeyGenerator<TEntity> : IXKeyGenerator<TEntity, int>
+    public class XIntKeyGenerator<TEntity> : XKeyGenerator<TEntity, int>, IXKeyGenerator<TEntity, int>
     where TEntity : XBaseEntity<int>
     {
-        public async Task<int> GenerateKey(
+        public override async Task<int> GenerateKey(
             IXBaseRepository<TEntity, int> repository,
             CancellationToken cancellationToken = default
         )
@@ -33,7 +33,7 @@ namespace xDataService.Providers
             return result;
         }
 
-        public bool IsEmpty(int id)
+        public override bool IsEmpty(int id)
         {
             //
             var result = id <= 0;

Providers/XKeyGenerator.cs

@@ -0,0 +1,18 @@
+using System.Threading;
+using System.Threading.Tasks;
+using xDataService.Interfaces;
+using xModels.Base;
+
+namespace xDataService.Providers
+{
+    public abstract class XKeyGenerator<TEntity, TKey> : IXKeyGenerator<TEntity, TKey>
+    where TEntity : XBaseEntity<TKey>
+    {
+        public abstract Task<TKey> GenerateKey(
+            IXBaseRepository<TEntity, TKey> repository, 
+            CancellationToken cancellationToken = default
+        );
+
+        public abstract bool IsEmpty(TKey id);
+    }
+}

Providers/XStringKeyGenerator.cs

@@ -12,7 +12,7 @@ namespace xDataService.Providers
     /// </summary>
     /// <typeparam name="TEntity"></typeparam>
 
-    public class XStringKeyGenerator<TEntity> : IXKeyGenerator<TEntity, string>
+    public class XStringKeyGenerator<TEntity> : XKeyGenerator<TEntity, string>, IXKeyGenerator<TEntity, string>
     where TEntity : XBaseEntity<string>
     {
         private readonly IXSequentialGuid sequentialGuid;
@@ -22,7 +22,7 @@ namespace xDataService.Providers
             this.sequentialGuid = sequentialGuid;
         }
 
-        public async Task<string> GenerateKey(
+        public override async Task<string> GenerateKey(
             IXBaseRepository<TEntity, string> repository,
             CancellationToken cancellationToken = default
         )
@@ -41,7 +41,7 @@ namespace xDataService.Providers
             }
         }
 
-        public bool IsEmpty(string id)
+        public override bool IsEmpty(string id)
         {
             return id.IsNullOrEmpty();
         }