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Saturday, March 1, 2014

Repository pattern with code first approach in mvc4



What is Repository Pattern?
A Repository separates the business logic from the interaction with data access logic or web service of the application. It acts like an in-memory business object collection. Repository hides the details of how exactly the requested data is being fetched/persisted from/to the database. Use this pattern to keep
- A single place to make changes to data access

- A single point responsible for a set of tables

- It easy to replace a repository with a fake implementation for testing

Also you can check out:

- Get user control value in aspx page in asp.net

- Adding meta tags to aspx pages in asp.net

- GAC in Asp.Net

Step 1:
Choose Internet Application template in mvc4 project, create a Contact model.
model: contact.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;

namespace CrudRepoPattContact.Models
{
    public class Contact
    {
        [Key]
        public int id { get; set; }
        [Required]
        [MaxLength(30)]
        public string name { get; set; }
        [RegularExpression(@"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$"      ,ErrorMessage="Invalid Emailid")]
        public string email { get; set; }
        [Column("Phone")]
        [Display(Name = "Phone number")]
        public string phoneNo { get; set; }
        public string city { get; set; }
     }
}
Step 2:
Create a folder named DAL in solution Explorer, create context class ,interface for repository and repository implementation class.
DAL folder:
Context Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
using CrudRepoPattContact.Models;

namespace CrudRepoPattContact.DAL
{
    public class ContactContext : DbContext
    {
        public ContactContext()
            : base("name=ContactConnectionString")
        {
        }
        public DbSet<Contact> Contacts { get; set; }
    }
}

In web.config file the connection string is,

  <connectionStrings>
    <add name="ContactConnectionString" connectionString="data source=MYHOME;Integrated Security=SSPI;Initial Catalog=Contact;" providerName="System.Data.SqlClient" />
  </connectionStrings>

IContactReopsitory interface
 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using CrudRepoPattContact.Models;
namespace CrudRepoPattContact.DAL
{
    public interface IContactReopsitory
    {
        IEnumerable<Contact> GetContacts();
        Contact GetContactByID(int ContId);
        void InsertContact(Contact contact);
        void DeleteContact(int ContId);
        void UpdateContact(Contact contact);
        void Save();

    }
}
ContactRepository class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using CrudRepoPattContact.Models;
namespace CrudRepoPattContact.DAL
{
    public class ContactRepository :IContactReopsitory
    {
        private ContactContext _context;
        public ContactRepository(ContactContext  contactContext)
        {
         this._context = contactContext;
         }

        public IEnumerable<Contact> GetContacts()
        {
            return _context.Contacts.ToList();
     
        }
        public  Contact GetContactByID(int ContId)
        {
            return _context.Contacts.Find(ContId);
     
        }
        public void InsertContact(Contact contact)
        {

            _context.Contacts.Add(contact);
        }
        public void DeleteContact(int ContId)
        {
             Contact contact = _context.Contacts.Find(ContId);
            _context.Contacts.Remove(contact);

     
        }
        public void UpdateContact(Contact contact)
        {
           _context.Entry(contact).State = EntityState.Modified;
     
        }
        public void Save()
        {
            _context.SaveChanges();
     
        }
         private bool disposed = false;
         protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    _context.Dispose();
                }
            }
            this.disposed = true;
        }
       public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
     }
}


Step 3:
Create ContactController with Contact model and ContactContext, specify the route of the controller and in RegisterRoutes method in Global.asax file



ContactController.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using CrudRepoPattContact.Models;
using CrudRepoPattContact.DAL;

namespace CrudRepoPattContact.Controllers
{
    public class ContactController : Controller
    {
        private ContactContext db = new ContactContext();

        // GET: /Contact/

        public ViewResult Index()
        {
            return View(db.Contacts.ToList());
        }

        // GET: /Contact/Details/5

        public ViewResult Details(int id)
        {
            Contact contact = db.Contacts.Find(id);
            return View(contact);
        }

        // GET: /Contact/Create

        public ActionResult Create()
        {
            return View();
        }

        // POST: /Contact/Create

        [HttpPost]
        public ActionResult Create(Contact contact)
        {
            if (ModelState.IsValid)
            {
                db.Contacts.Add(contact);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(contact);
        }

        // GET: /Contact/Edit/5

        public ActionResult Edit(int id)
        {
            Contact contact = db.Contacts.Find(id);
            return View(contact);
        }

        // POST: /Contact/Edit/5

        [HttpPost]
        public ActionResult Edit(Contact contact)
        {
            if (ModelState.IsValid)
            {
                db.Entry(contact).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(contact);
        }

        // GET: /Contact/Delete/5

        public ActionResult Delete(int id)
        {
            Contact contact = db.Contacts.Find(id);
            return View(contact);
        }

        // POST: /Contact/Delete/5

        [HttpPost, ActionName("Delete")]
        public ActionResult DeleteConfirmed(int id)
        {          
            Contact contact = db.Contacts.Find(id);
            db.Contacts.Remove(contact);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        protected override void Dispose(bool disposing)
        {
            db.Dispose();
            base.Dispose(disposing);
        }
    }
}

Global.asax.cs

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Contact", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );

        }

views:
Create.cshtml

@model CrudRepoPattContact.Models.Contact

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>Contact</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.name)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.name)
            @Html.ValidationMessageFor(model => model.name)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.email)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.email)
            @Html.ValidationMessageFor(model => model.email)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.phoneNo)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.phoneNo)
            @Html.ValidationMessageFor(model => model.phoneNo)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.city)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.city)
            @Html.ValidationMessageFor(model => model.city)
        </div>

        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>


Delete.cshtml

@model CrudRepoPattContact.Models.Contact

@{
    ViewBag.Title = "Delete";
}

<h2>Delete</h2>

<h3>Are you sure you want to delete this?</h3>
<fieldset>
    <legend>Contact</legend>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.name)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.name)
    </div>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.email)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.email)
    </div>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.phoneNo)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.phoneNo)
    </div>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.city)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.city)
    </div>
</fieldset>
@using (Html.BeginForm()) {
    <p>
        <input type="submit" value="Delete" /> |
        @Html.ActionLink("Back to List", "Index")
    </p>
}


Details.cshtml

@model CrudRepoPattContact.Models.Contact

@{
    ViewBag.Title = "Details";
}

<h2>Details</h2>

<fieldset>
    <legend>Contact</legend>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.name)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.name)
    </div>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.email)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.email)
    </div>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.phoneNo)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.phoneNo)
    </div>

    <div class="display-label">
         @Html.DisplayNameFor(model => model.city)
    </div>
    <div class="display-field">
        @Html.DisplayFor(model => model.city)
    </div>
</fieldset>
<p>
    @Html.ActionLink("Edit", "Edit", new { id=Model.id }) |
    @Html.ActionLink("Back to List", "Index")
</p>

Edit.cshtml

@model CrudRepoPattContact.Models.Contact

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>Contact</legend>

        @Html.HiddenFor(model => model.id)

        <div class="editor-label">
            @Html.LabelFor(model => model.name)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.name)
            @Html.ValidationMessageFor(model => model.name)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.email)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.email)
            @Html.ValidationMessageFor(model => model.email)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.phoneNo)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.phoneNo)
            @Html.ValidationMessageFor(model => model.phoneNo)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.city)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.city)
            @Html.ValidationMessageFor(model => model.city)
        </div>

        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

Index.cshtml

@model IEnumerable<CrudRepoPattContact.Models.Contact>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.name)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.email)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.phoneNo)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.city)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.name)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.email)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.phoneNo)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.city)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.id }) |
            @Html.ActionLink("Details", "Details", new { id=item.id }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.id })
        </td>
    </tr>
}

</table>









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