Add project files.

Core.Blueprint.SQLServer/Repositories/EntityRepository.cs

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+using Microsoft.EntityFrameworkCore;
+using System.Linq.Expressions;
+
+namespace Core.Blueprint.DAL.SQLServer
+{
+    /// <summary>
+    /// The <see cref="EntityRepository{TEntity, TContext}"/> class provides a comprehensive generic repository 
+    /// for managing entities using Entity Framework Core with SQL Server as the underlying database.
+    /// Designed as a package for consumption by external applications.
+    /// </summary>
+    /// <typeparam name="TEntity">The entity type managed by the repository. Must be a class.</typeparam>
+    /// <typeparam name="TContext">The database context type. Must inherit from <see cref="DbContext"/>.</typeparam>
+    public class EntityRepository<TEntity, TContext> : IEntityRepository<TEntity, TContext>
+        where TEntity : class
+        where TContext : DbContext
+    {
+        private readonly TContext _context;
+        private readonly DbSet<TEntity> _dbSet;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="EntityRepository{TEntity, TContext}"/> class with a specified database context.
+        /// </summary>
+        /// <param name="context">The <see cref="TContext"/> for database operations.</param>
+        public EntityRepository(TContext context)
+        {
+            _context = context;
+            _dbSet = _context.Set<TEntity>();
+        }
+
+        /// <summary>
+        /// Retrieves all entities of type <typeparamref name="TEntity"/> from the database.
+        /// </summary>
+        /// <returns>A task representing the asynchronous operation, with a list of entities as the result.</returns>
+        public async Task<IEnumerable<TEntity>> GetAllAsync()
+        {
+            return await _dbSet.ToListAsync();
+        }
+
+        /// <summary>
+        /// Retrieves all entities of type <typeparamref name="TEntity"/> from the database that match a specified filter.
+        /// </summary>
+        /// <param name="predicate">An expression to filter entities.</param>
+        /// <returns>A task representing the asynchronous operation, with a list of filtered entities as the result.</returns>
+        public async Task<IEnumerable<TEntity>> GetByConditionAsync(Expression<Func<TEntity, bool>> predicate)
+        {
+            return await _dbSet.Where(predicate).ToListAsync();
+        }
+
+        /// <summary>
+        /// Retrieves a single entity of type <typeparamref name="TEntity"/> by its identifier.
+        /// </summary>
+        /// <param name="id">The identifier of the entity.</param>
+        /// <returns>A task representing the asynchronous operation, with the entity as the result, or null if not found.</returns>
+        public async Task<TEntity?> GetByIdAsync(int id)
+        {
+            var existingEntity = await _dbSet.FindAsync(id);
+
+            if (existingEntity != null)
+            {
+                _context.Entry(existingEntity).State = EntityState.Detached;
+            }
+
+            return existingEntity;
+        }
+
+        /// <summary>
+        /// Adds a new entity to the database.
+        /// </summary>
+        /// <param name="entity">The entity to add.</param>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        public async Task AddAsync(TEntity entity)
+        {
+            await _dbSet.AddAsync(entity);
+        }
+
+        /// <summary>
+        /// Adds multiple entities to the database.
+        /// </summary>
+        /// <param name="entities">The collection of entities to add.</param>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        public async Task AddRangeAsync(IEnumerable<TEntity> entities)
+        {
+            await _dbSet.AddRangeAsync(entities);
+        }
+
+        /// <summary>
+        /// Updates an existing entity in the database.
+        /// </summary>
+        /// <param name="entity">The entity to update.</param>
+        /// <returns>The updated entity.</returns>
+        public TEntity Update(TEntity entity)
+        {
+            _dbSet.Attach(entity);
+            _context.Entry(entity).State = EntityState.Modified;
+            return entity;
+        }
+
+        /// <summary>
+        /// Updates multiple entities in the database.
+        /// </summary>
+        /// <param name="entities">The collection of entities to update.</param>
+        public void UpdateRange(IEnumerable<TEntity> entities)
+        {
+            foreach (var entity in entities)
+            {
+                _dbSet.Attach(entity);
+                _context.Entry(entity).State = EntityState.Modified;
+            }
+        }
+
+        /// <summary>
+        /// Deletes an entity from the database.
+        /// </summary>
+        /// <param name="entity">The entity to delete.</param>
+        public void Delete(TEntity entity)
+        {
+            if (_context.Entry(entity).State == EntityState.Detached)
+            {
+                _dbSet.Attach(entity);
+            }
+            _dbSet.Remove(entity);
+        }
+
+        /// <summary>
+        /// Deletes multiple entities from the database.
+        /// </summary>
+        /// <param name="entities">The collection of entities to delete.</param>
+        public void DeleteRange(IEnumerable<TEntity> entities)
+        {
+            _dbSet.RemoveRange(entities);
+        }
+
+        /// <summary>
+        /// Retrieves the first entity matching the specified condition or null if no match is found.
+        /// </summary>
+        /// <param name="predicate">An expression to filter entities.</param>
+        /// <returns>A task representing the asynchronous operation, with the matched entity as the result.</returns>
+        public async Task<TEntity?> FirstOrDefaultAsync(Expression<Func<TEntity, bool>> predicate)
+        {
+            return await _dbSet.FirstOrDefaultAsync(predicate);
+        }
+
+        /// <summary>
+        /// Determines if any entities exist that match the specified condition.
+        /// </summary>
+        /// <param name="predicate">An expression to filter entities.</param>
+        /// <returns>A task representing the asynchronous operation, with a boolean result indicating existence.</returns>
+        public async Task<bool> AnyAsync(Expression<Func<TEntity, bool>> predicate)
+        {
+            return await _dbSet.AnyAsync(predicate);
+        }
+
+        /// <summary>
+        /// Saves all pending changes to the database.
+        /// </summary>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        public async Task SaveAsync()
+        {
+            await _context.SaveChangesAsync();
+        }
+
+        /// <summary>
+        /// Executes a raw SQL query and maps the result to the specified entity type.
+        /// </summary>
+        /// <param name="sql">The raw SQL query.</param>
+        /// <param name="parameters">Optional parameters for the query.</param>
+        /// <returns>An <see cref="IEnumerable{TEntity}"/> representing the result set.</returns>
+        public async Task<IEnumerable<TEntity>> ExecuteRawSqlAsync(string sql, params object[] parameters)
+        {
+            return await _dbSet.FromSqlRaw(sql, parameters).ToListAsync();
+        }
+
+        /// <summary>
+        /// Counts the total number of entities in the database.
+        /// </summary>
+        /// <returns>A task representing the asynchronous operation, with the count as the result.</returns>
+        public async Task<int> CountAsync()
+        {
+            return await _dbSet.CountAsync();
+        }
+    }
+}