CRUD Operations in MVC4 Using AngularJS and WCF REST Services

2021-11-03 21:46:27

Now in this article I will show how to do Create, Retrieve, Update and Delete (CRUD) operations in MVC4 using AngularJS and WCF REST Services.

The following are the highlights of this article:

Create a Database. (SchoolManagement).
Create a Table (Student).
Create a WCF REST Service Application to do CRUD operations.
Create a MVC 4 application and use AngularJs to consume WCF REST service.
Perform the CRUD (Create, Read, Update & Delete) operations.

Angular

AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. AngularJS is a JavaScript framework. Its goal is to augment browser-based applications with Model–View–Controller (MVC) capability, in an effort to make both development and testing easier.

REST

stands for Representational State Transfer . This is a protocol for exchanging data over a distributed environment. The main idea behind REST is that we should treat our distributed services as a resource and we should be able to use simple HTTP protocols to perform various operations on that resource.

When we talk about the database as a resource, we usually talk in terms of Create, Retrieve, Update and Delete (CRUD) operations. Now the philosophy of REST is that for a remote resource all these operations should be possible and they should be possible using simple HTTP protocols.

Now the basic CRUD operations are mapped to the HTTP protocols in the following manner:

GET: Retrieve the required data (representation of data) from the remote resource.
POST: Update the current representation of the data on the remote server.
PUT: Insert new data.
DELETE: Delete the specified data from the remote server.

Now we will go step-by-step.

The following is my data table.

Image 1

The following is the script of my data table:

CREATE TABLE [dbo].[Student](
[StudentID] [ int ] IDENTITY(1,1) NOT NULL ,
[ Name ] [ varchar ](50) NULL ,
[Email] [ varchar ](500) NULL ,
[Class] [ varchar ](50) NULL ,
[EnrollYear] [ varchar ](50) NULL ,
[City] [ varchar ](50) NULL ,
[Country] [ varchar ](50) NULL ,
CONSTRAINT [PK_Student] PRIMARY KEY CLUSTERED
(
[StudentID] ASC
) WITH (PAD_INDEX = OFF , STATISTICS_NORECOMPUTE = OFF , IGNORE_DUP_KEY = OFF , ALLOW_ROW_LOCKS = ON , ALLOW_PAGE_LOCKS = ON ) ON [ PRIMARY ]
) ON [ PRIMARY ]
GO
SET ANSI_PADDING OFF
GO

So first we need to create the WCF REST Service. So use the following procedure.

Open Visual Studio and select "File" -> "New" -> "Project..." then select WCF in the left Side then select WCF Service Application then click OK.

Image 2

Now delete the IService.cs and Service.cs files.

Image 3

Now right-click on the project in the Solution Explorer then select Add New Item then select WCF Service then name it as EmployeeService.

Image 4

Now I will create a Data Contract as StudentDataContract.

Right-click on the project in the Solution Explorer then select Add New Item then add a .cs file and use the following code:

Image 5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization;
namespace WCF_REST_Service
{
public class StudentDataContract
{
[DataContract]
public class EmployeeDataContract
{
[DataMember]
public string StudentID { get ; set ; }
[DataMember]
public string Name { get ; set ; }
[DataMember]
public string Email { get ; set ; }
[DataMember]
public string Class { get ; set ; }
[DataMember]
public string EnrollYear { get ; set ; }
[DataMember]
public string City { get ; set ; }
[DataMember]
public string Country { get ; set ; }
}
}
}

Now it is time to add your database to your application. So create a new folder name as the Model in your project. Now right-click on the Model folder and select Add -> New Item.

Image 6

Select the ADO.NET Entity Data Model.

Image 7

Image 8

Here click on New Connection then enter your SQL Server Details then select your database.

Image 9

Image 10

Image 11

Image 12

Now open the IStudentService.cs file to define an interface:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using WCF_REST_Service.Model;
namespace WCF_REST_Service
{
public class StudentService : IStudentService
{
SchoolManagementEntities ctx;
public StudentService()
{
ctx = new SchoolManagementEntities();
}
public List<StudentDataContract> GetAllStudent()
{
var query = (from a in ctx.Student
select a).Distinct();
List<StudentDataContract> studentList = new List<StudentDataContract>();
query.ToList().ForEach(rec =>
{
studentList.Add( new StudentDataContract
{
StudentID = Convert.ToString(rec.StudentID),
Name = rec.Name,
Email = rec.Email,
EnrollYear = rec.EnrollYear,
Class = rec.Class,
City = rec.City,
Country = rec.Country
});
});
return studentList;
}
public StudentDataContract GetStudentDetails( string StudentId)
{
StudentDataContract student = new StudentDataContract();
try
{
int Emp_ID = Convert.ToInt32(StudentId);
var query = (from a in ctx.Student
where a.StudentID.Equals(Emp_ID)
select a).Distinct().FirstOrDefault();
student.StudentID = Convert.ToString(query.StudentID);
student.Name = query.Name;
student.Email = query.Email;
student.EnrollYear = query.EnrollYear;
student.Class = query.Class;
student.City = query.City;
student.Country = query.Country;
}
catch (Exception ex)
{
throw new FaultException< string >
(ex.Message);
}
return student;
}
public bool AddNewStudent(StudentDataContract student)
{
try
{
Student std = ctx.Student.Create();
std.Name = student.Name;
std.Email = student.Email;
std.Class = student.Class;
std.EnrollYear = student.EnrollYear;
std.City = student.City;
std.Country = student.Country;
ctx.Student.Add(std);
ctx.SaveChanges();
}
catch (Exception ex)
{
throw new FaultException< string >
(ex.Message);
}
return true ;
}
public void UpdateStudent(StudentDataContract student)
{
try
{
int Stud_Id = Convert.ToInt32(student.StudentID);
Student std = ctx.Student.Where(rec => rec.StudentID == Stud_Id).FirstOrDefault();
std.Name = student.Name;
std.Email = student.Email;
std.Class = student.Class;
std.EnrollYear = student.EnrollYear;
std.City = student.City;
std.Country = student.Country;
ctx.SaveChanges();
}
catch (Exception ex)
{
throw new FaultException< string >
(ex.Message);
}
}
public void DeleteStudent( string StudentId)
{
try
{
int Stud_Id = Convert.ToInt32(StudentId);
Student std = ctx.Student.Where(rec => rec.StudentID == Stud_Id).FirstOrDefault();
ctx.Student.Remove(std);
ctx.SaveChanges();
}
catch (Exception ex)
{
throw new FaultException< string >
(ex.Message);
}
}
}
}

Now make the following changes in your WCF application web.config file:

<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled= "true" httpsGetEnabled= "true" />
<serviceDebug includeExceptionDetailInFaults= "false" />
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior>
<webHttp helpEnabled= "True" />
</behavior>
</endpointBehaviors>
</behaviors>
<protocolMapping>
<add binding= "webHttpBinding" scheme= "http" />
</protocolMapping>
<serviceHostingEnvironment aspNetCompatibilityEnabled= "true" multipleSiteBindingsEnabled= "true" />
</system.serviceModel>

Now our WCF REST Service is ready; run the WCF REST service.

Image 13

It is now time to create a new MVC application. So right-click on your solution and add a new project as below:

Image 14

Image 15

Image 16

Now, add your WCF Service URL to your MVC application. You can host your WCF service in IIS or you can run it and discover the URL locally like the following.

Right-click on your MVC project then select Add Service Reference.

Image 17

Image 18

Now it is time to add the AngularJs reference. So right-click on your MVC project name in the Solution Explorer then select Add NuGet Packages.

Image 19

Image 20

Now create a new folder (MyScripts) under the Scripts Folder. Here add the following 3 JavaScript files:

Modules.JS
Controllers.JS
Services.JS

1. Module.JS

/// <reference path="../angular.min.js" />
var app;
( function () {
app = angular.module( "RESTClientModule" , []);
})();

2. Controller.JS

/// <reference path="../angular.min.js" />
/// <reference path="Modules.js" />
/// <reference path="Services.js" />
app.controller( "CRUD_AngularJs_RESTController" , function ($scope, CRUD_AngularJs_RESTService) {
$scope.OperType = 1;
//1 Mean New Entry
GetAllRecords();
//To Get All Records
function GetAllRecords() {
var promiseGet = CRUD_AngularJs_RESTService.getAllStudent();
promiseGet.then( function (pl) { $scope.Students = pl.data },
function (errorPl) {
$log.error( 'Some Error in Getting Records.' , errorPl);
});
}
//To Clear all input controls.
function ClearModels() {
$scope.OperType = 1;
$scope.StudentID = "" ;
$scope.Name = "" ;
$scope.Email = "" ;
$scope.Class = "" ;
$scope.EnrollYear = "" ;
$scope.City = "" ;
$scope.Country = "" ;
}
//To Create new record and Edit an existing Record.
$scope.save = function () {
var Student = {
Name: $scope.Name,
Email: $scope.Email,
Class: $scope.Class,
EnrollYear: $scope.EnrollYear,
City: $scope.City,
Country: $scope.Country
};
if ($scope.OperType === 1) {
var promisePost = CRUD_AngularJs_RESTService.post(Student);
promisePost.then( function (pl) {
$scope.StudentID = pl.data.StudentID;
GetAllRecords();
ClearModels();
}, function (err) {
console.log( "Some error Occured" + err);
});
} else {
//Edit the record
debugger ;
Student.StudentID = $scope.StudentID;
var promisePut = CRUD_AngularJs_RESTService.put($scope.StudentID, Student);
promisePut.then( function (pl) {
$scope.Message = "Student Updated Successfuly" ;
GetAllRecords();
ClearModels();
}, function (err) {
console.log( "Some Error Occured." + err);
});
}
};
//To Get Student Detail on the Base of Student ID
$scope.get = function (Student) {
var promiseGetSingle = CRUD_AngularJs_RESTService.get(Student.StudentID);
promiseGetSingle.then( function (pl) {
var res = pl.data;
$scope.StudentID = res.StudentID;
$scope.Name = res.Name;
$scope.Email = res.Email;
$scope.Class = res.Class;
$scope.EnrollYear = res.EnrollYear;
$scope.City = res.City;
$scope.Country = res.Country;
$scope.OperType = 0;
},
function (errorPl) {
console.log( 'Some Error in Getting Details' , errorPl);
});
}
//To Delete Record
$scope. delete = function (Student) {
var promiseDelete = CRUD_AngularJs_RESTService. delete (Student.StudentID);
promiseDelete.then( function (pl) {
$scope.Message = "Student Deleted Successfuly" ;
GetAllRecords();
ClearModels();
}, function (err) {
console.log( "Some Error Occured." + err);
});
}
});

3. Services.JS

Here change the WCF Service URL according to your WCF Service.

/// <reference path="../angular.min.js" />
/// <reference path="Modules.js" />
app.service( "CRUD_AngularJs_RESTService" , function ($http) {
//Create new record
this .post = function (Student) {
var request = $http({
method: "post" ,
url: "http://localhost:27321/StudentService.svc/AddNewStudent" ,
data: Student
});
return request;
}
//Update the Record
this .put = function (StudentID, Student) {
debugger ;
var request = $http({
method: "put" ,
url: "http://localhost:27321/StudentService.svc/UpdateStudent" ,
data: Student
});
return request;
}
this .getAllStudent = function () {
return $http.get( "http://localhost:27321/StudentService.svc/GetAllStudent" );
};
//Get Single Records
this .get = function (StudentID) {
return $http.get( "http://localhost:27321/StudentService.svc/GetStudentDetails/" + StudentID);
}
//Delete the Record
this . delete = function (StudentID) {
var request = $http({
method: "delete" ,
url: "http://localhost:27321/StudentService.svc/DeleteStudent/" + StudentID
});
return request;
}
});

Now add a new controller as in the following:

Right-click on the Controller folder then select Add New.

Image 21

Image 22

Now add a View.

Right-click on Index then select "Add View...".

Image 23

Image 24

Now Index.cshtm will be:

<html data-ng-app= "RESTClientModule" >
@{
ViewBag.Title = "Manage Student Information using AngularJs, WCF REST & MVC4" ;
}
<body>
<table id= "tblContainer" data-ng-controller= "CRUD_AngularJs_RESTController" >
<tr>
<td>
<table style= "border: solid 2px Green; padding: 5px;" >
<tr style= "height: 30px; background-color: skyblue; color: maroon;" >
<th></th>
<th>ID</th>
<th>Name</th>
<th>Email</th>
<th>Class</th>
<th>Year</th>
<th>City</th>
<th>Country</th>
<th></th>
<th></th>
</tr>
<tbody data-ng-repeat= "stud in Students" >
<tr>
<td></td>
<td><span>{{stud.StudentID}}</span></td>
<td><span>{{stud.Name}}</span></td>
<td><span>{{stud.Email}}</span></td>
<td><span>{{stud.Class}}</span></td>
<td><span>{{stud.EnrollYear}}</span></td>
<td><span>{{stud.City}}</span></td>
<td><span>{{stud.Country}}</span></td>
<td>
<input type= "button" id= "Edit" value= "Edit" data-ng-click= "get(stud)" /></td>
<td>
<input type= "button" id= "Delete" value= "Delete" data-ng-click= "delete(stud)" /></td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr>
<td>
<div style= "color: red;" >{{Message}}</div>
<table style= "border: solid 4px Red; padding: 2px;" >
<tr>
<td></td>
<td>
<span>Student ID</span>
</td>
<td>
<input type= "text" id= "StudentID" readonly= "readonly" data-ng-model= "StudentID" />
</td>
</tr>
<tr>
<td></td>
<td>
<span>Student Name</span>
</td>
<td>
<input type= "text" id= "sName" required data-ng-model= "Name" />
</td>
</tr>
<tr>
<td></td>
<td>
<span>Email</span>
</td>
<td>
<input type= "text" id= "sEmail" required data-ng-model= "Email" />
</td>
</tr>
<tr>
<td></td>
<td>
<span>Class</span>
</td>
<td>
<input type= "text" id= "sClass" required data-ng-model= "Class" />
</td>
</tr>
<tr>
<td></td>
<td>
<span>Enrollement Year</span>
</td>
<td>
<input type= "text" id= "sEnrollYear" required data-ng-model= "EnrollYear" />
</td>
</tr>
<tr>
<td></td>
<td>
<span>City</span>
</td>
<td>
<input type= "text" id= "sCity" required data-ng-model= "City" />
</td>
</tr>
<tr>
<td></td>
<td>
<span>Country</span>
</td>
<td>
<input type= "text" id= "sCountry" required data-ng-model= "Country" />
</td>
</tr>
<tr>
<td></td>
<td></td>
<td>
<input type= "button" id= "save" value= "Save" data-ng-click= "save()" />
<input type= "button" id= "Clear" value= "Clear" data-ng-click= "clear()" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
<script src= "~/Scripts/angular.js" ></script>
<script src= "~/Scripts/MyScripts/Modules.js" ></script>
<script src= "~/Scripts/MyScripts/Services.js" ></script>
<script src= "~/Scripts/MyScripts/Controllers.js" ></script>

It is now time to run the application. To run your view make the following changes in Route.config:

Image 25

Now run application as in the following:

Image 26

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码农公寓

1. Module.JS

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