Migrate from Basic to MVVM and MEF Composable Patterns for a Silverlight Application - Part 3


namespace ProductRiaLib.Web.Services
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.ComponentModel.DataAnnotations;
    using System.Data;
    using System.Data.Entity.Infrastructure;
    using System.Linq;
    using System.ServiceModel.DomainServices.EntityFramework;
    using System.ServiceModel.DomainServices.Hosting;
    using System.ServiceModel.DomainServices.Server;
    using ProductRiaLib.Web.Models;


    // Implements application logic using the ProductDbContext context.
    // TODO: Add your application logic to these methods or in additional methods.
    // TODO: Wire up authentication (Windows/ASP.NET Forms) and uncomment the following to disable anonymous access
    // Also consider adding roles to restrict access as appropriate.
    // [RequiresAuthentication]
    [EnableClientAccess()]
    public class ProductDomainService : DbDomainService<ProductDbContext>
    {

        // TODO:
        // Consider constraining the results of your query method.  If you need additional input you can
        // add parameters to this method or create additional query methods with different names.
        // To support paging you will need to add ordering to the 'Categories' query.
        public IQueryable<Category> GetCategories()
        {
            return this.DbContext.Categories;
        }

        public void InsertCategory(Category category)
        {
            DbEntityEntry<Category> entityEntry = this.DbContext.Entry(category);
            if ((entityEntry.State != EntityState.Detached))
            {
                entityEntry.State = EntityState.Added;
            }
            else
            {
                this.DbContext.Categories.Add(category);
            }
        }

        public void UpdateCategory(Category currentCategory)
        {
            this.DbContext.Categories.AttachAsModified(currentCategory, this.ChangeSet.GetOriginal(currentCategory), this.DbContext);
        }

        public void DeleteCategory(Category category)
        {
            DbEntityEntry<Category> entityEntry = this.DbContext.Entry(category);
            if ((entityEntry.State != EntityState.Deleted))
            {
                entityEntry.State = EntityState.Deleted;
            }
            else
            {
                this.DbContext.Categories.Attach(category);
                this.DbContext.Categories.Remove(category);
            }
        }

        // TODO:
        // Consider constraining the results of your query method.  If you need additional input you can
        // add parameters to this method or create additional query methods with different names.
        // To support paging you will need to add ordering to the 'Products' query.
        public IQueryable<Product> GetProducts()
        {
            return this.DbContext.Products;
        }

        public IQueryable<Product> GetCategorizedProduct(int categoryId)
        {
            return this.DbContext.Products.Where(e => e.CategoryID == categoryId).OrderBy(e => e.ProductName);
        }
        
        public void InsertProduct(Product product)
        {
            DbEntityEntry<Product> entityEntry = this.DbContext.Entry(product);
            if ((entityEntry.State != EntityState.Detached))
            {
                entityEntry.State = EntityState.Added;
            }
            else
            {
                this.DbContext.Products.Add(product);
            }
        }

        public void UpdateProduct(Product currentProduct)
        {
            this.DbContext.Products.AttachAsModified(currentProduct, this.ChangeSet.GetOriginal(currentProduct), this.DbContext);
        }

        public void DeleteProduct(Product product)
        {
            DbEntityEntry<Product> entityEntry = this.DbContext.Entry(product);
            if ((entityEntry.State != EntityState.Deleted))
            {
                entityEntry.State = EntityState.Deleted;
            }
            else
            {
                this.DbContext.Products.Attach(product);
                this.DbContext.Products.Remove(product);
            }
        }
    }
}