Add CountAsync method in the generic repositories. (ardalis#141)

* Added CountAsync method in the generic repositories.

* Fixed xml comment.

Author: fiseni

ArdalisSpecification/src/Ardalis.Specification/IReadRepositoryBase.cs

@@ -90,5 +90,14 @@ public interface IReadRepositoryBase<T> where T : class
         /// number of elements in the input sequence.
         /// </returns>
         Task<int> CountAsync(ISpecification<T> specification, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// Returns the total number of records.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation. The task result contains the
+        /// number of elements in the input sequence.
+        /// </returns>
+        Task<int> CountAsync(CancellationToken cancellationToken = default);
     }
 }

ArdalisSpecificationEF/src/Ardalis.Specification.EF/RepositoryBaseOfT.cs

@@ -103,6 +103,12 @@ public virtual async Task<int> CountAsync(ISpecification<T> specification, Cance
             return await ApplySpecification(specification, true).CountAsync(cancellationToken);
         }
 
+        /// <inheritdoc/>
+        public virtual async Task<int> CountAsync(CancellationToken cancellationToken = default)
+        {
+            return await dbContext.Set<T>().CountAsync(cancellationToken);
+        }
+
         /// <summary>
         /// Filters the entities  of <typeparamref name="T"/>, to those that match the encapsulated query logic of the
         /// <paramref name="specification"/>.

ArdalisSpecificationEF/src/Ardalis.Specification.EntityFramework6/RepositoryBaseOfT.cs

@@ -103,6 +103,12 @@ public virtual async Task<int> CountAsync(ISpecification<T> specification, Cance
             return await ApplySpecification(specification, true).CountAsync(cancellationToken);
         }
 
+        /// <inheritdoc/>
+        public virtual async Task<int> CountAsync(CancellationToken cancellationToken = default)
+        {
+            return await dbContext.Set<T>().CountAsync(cancellationToken);
+        }
+
         /// <summary>
         /// Filters the entities  of <typeparamref name="T"/>, to those that match the encapsulated query logic of the
         /// <paramref name="specification"/>.

sample/Ardalis.SampleApp.Infrastructure/Data/CachedCustomerRepository.cs

@@ -36,6 +36,13 @@ public Task<int> CountAsync(Specification.ISpecification<T> specification, Cance
             return _sourceRepository.CountAsync(specification, cancellationToken);
         }
 
+        /// <inheritdoc/>
+        public Task<int> CountAsync(CancellationToken cancellationToken = default)
+        {
+            // TODO: Add Caching
+            return _sourceRepository.CountAsync(cancellationToken);
+        }
+
         /// <inheritdoc/>
         public Task<T> GetByIdAsync(int id, CancellationToken cancellationToken = default)
         {