public class DataRepository : IRepository
    {
        
        private DataContext context;

        public DataRepository(DataContext ctx) => context = ctx;

       public IEnumerable<Product> ProductsChoose(Func<Product, bool> func)
          {
            IEnumerable<Product> p = context.Products
                    .Where(func)
                    .ToList();    
            return p;   
           }

     IEnumerable<Product> p = repository.ProductsChoose(x => x.RetailPrice < 100);

Executed DbCommand (31ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT [p].[Id], [p].[CategoryId], [p].[Name], [p].[PurchasePrice], [p].[RetailPrice]
FROM [Products] AS [p]

public IEnumerable<Product> ProductsChoose(Func<Product, bool> func)
          {
            IEnumerable<Product> p = context.Products
                    .Where(x => x.RetailPrice < 100)
                    .ToList();    
            return p;   }

SELECT [x].[Id], [x].[CategoryId], [x].[Name], [x].[PurchasePrice], [x].[RetailPrice]
FROM [Products] AS [x]
WHERE [x].[RetailPrice] < 100.0