first edit

XLIMS.CONTRACT/IGenericRepository.cs

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+using System.Linq.Expressions;
+
+namespace XLIMS.CONTRACT
+{
+    // Интерфейс generic-репозитория
+    public interface IGenericRepository<TEntity> where TEntity : class
+    {
+        Task<TEntity> GetByIdAsync(int id);
+        Task<IEnumerable<TEntity>> GetAllAsync();
+        Task<IEnumerable<TEntity>> WhereAsync(Expression<Func<TEntity, bool>> predicate);
+        IEnumerable<TEntity> Find(Expression<Func<TEntity, bool>> predicate);
+        Task<IEnumerable<TEntity>> FindAsync(Expression<Func<TEntity, bool>> predicate);
+
+        Task<TEntity> SingleOrDefaultAsync(Expression<Func<TEntity, bool>> predicate);
+
+        Task AddAsync(TEntity entity);
+        Task AddRangeAsync(IEnumerable<TEntity> entities);
+
+        Task UpdateAsync(TEntity entity);
+        Task UpdateRangeAsync(IEnumerable<TEntity> entities);
+
+        Task RemoveAsync(TEntity entity);
+        Task RemoveRangeAsync(IEnumerable<TEntity> entities);
+
+        Task<int> CountAsync(Expression<Func<TEntity, bool>> predicate = null);
+
+        event Action SetChanged;
+
+        Task<int> SaveChangesAsync();
+        int SaveChanges();
+    }
+}