Question

I created a new class library project in Visual Studio 2012, to define data classes in order to enable new database creation using Entity Framework code first. So I created 3 classes:

Product as next:

namespace MyClassLibrary
{
    public class Product
    {
        public virtual int ID { get; set; }
        public virtual string Name { get; set; }
    }
}

Category as next:

using System.Collections.Generic;

namespace MyClassLibrary
{
    public class Department
    {
        public virtual int ID { get; set; }
        public virtual string Name { get; set; }
        public virtual ICollection<Product> Products { get; set; }
    }
}

and ICategoryDataSource as next:

using System.Linq;

namespace MyClassLibrary
{
    public class ICategoryDataSource
    {
        IQueryable<Product> Products { get; }
        IQueryable<Category> Categories { get; }
    }
}

In the last class, I get the next error message: ‘MyClassLibrary.ICategoryDataSource.Products.get’ must declare a body because it is not marked abstract or extern. Automatically implemented properties must define both get and set accessors.

I do not need a setter here, please advise how can I avoid using set accessors.

Answer 1

By the name in the last code section, I assume you want ICategoryDataSource to be an interface, not a class:

using System.Linq;

namespace MyClassLibrary
{
    public interface ICategoryDataSource
    {
        IQueryable<Product> Products { get; }
        IQueryable<Category> Categories { get; }
    }
}