在MVC4和C＃中的不同控制器中重构LINQ查询

Question

I am trying to apply the DRY (Do Not Repeat Yourself) to my MVC4 program.

I have two LINQ queries in two different controllers.

The queries are the same.

What is the best way to make the query available to both controllers.

Thank you in advance for suggestions.

Answer 1

Based on what you've said, the LINQ statements are the same, correct? For example, getting a list of active hourly employees, in stock inventory items or such.

In this situation, it would probably be best to add these commonly used methods to your Entity model. If you generated the classes, they're partial classes so you would simply create a partial class with the routines you need to retrieve the commonly used data. This class would go in your models folder. It would look something like this...

namespace MyNamespace.Models
{
    public partial class MyEntities
    {

        IQueryable<InventoryItem> InStockInventoryItems()
        {
            return this.InventoryItems.Where(m => m.Quantity > 0);
        }

    }
}