Create And Publish ASP.NET WEB API In Azure

Gowtham K
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Introduction

This article will give you step by step instructions of creating an ASP.NET Web API service, using Entity framework, and publishing it in Azure.

Prerequisites

Basic knowledge of ASP.NET Web API, Entity Framework, Kendo UI Framework, and Azure Web apps.

Create an SQL Database in Azure

Let's start with creating a database in Azure. Please check here how to create new database in Azure.

I have created a new database in Azure. Connect the database in SSMS (SQL Studio Management Service), as shown in the image below.

The script for creating a table is given below.

CREATE TABLE Employee
(
EmployeeID INT IDENTITY(1,1) CONSTRAINT Pk_Emp_Id PRIMARY KEY,
FirstName VARCHAR(20),
LastName VARCHAR(20)
)

Insert some sample record, as shown below.

INSERT INTO Employee VALUES('Bob','Ross')
INSERT INTO Employee VALUES('Pradeep','Raj')
INSERT INTO Employee VALUES('Arun','Kumar')
INSERT INTO Employee VALUES('Vasanth','Kumar')

Create a new ASP.NET Web API application

Create a new ASP.NET Web API Application, as per the following figures. Open Visual Studio ->File ->New project ->ASP.NET Web Application.

Make sure, the host in Cloud is checked and click OK.

Once Azure Web app settings are configured, click OK.

Let us start creating a Model in the application.

Generate the Model

Now, we will create Entity Framework Models from the database tables.

Step 1 - Right-click the Models folder, select Add, and New Item.

Step 2 - In the Add New Items window, select data in the left pane and ADO.NET Entity Data Model from the center pane. Name the new Model file as Employee and click Add.

Step 3 - In the Entity Data Model wizard, select EF Designer from the database and click Next.

Step 4 - Click New Connection button.

Step 5 - In Connection Properties window, provide the name of the Azure SQL Server where the database was created. After providing the Server name, select Employee from the available databases and click OK.

Step 6 - You can use the default name for connection to save in the Web.Config file and click Next.

Step 7 - Select the table to generate models for Employee table and click Finish.

Create a Controller

Create a new empty Controller. Right-click the Controllers folder and select Add –> New Empty Web API 2 Controller. In my case, I named it as EmployeeCRUD Controller.

Write the code, given below, in the Controller file.

public class EmployeesController : ApiController
{
private EmployeeEntities db = new EmployeeEntities();
// GET: api/Employees
public IQueryable<Employee> GetEmployees()
{
return db.Employees;
}
// PUT: api/Employees/5
public HttpResponseMessage PutEmployee(Employee employee)
{
if (!ModelState.IsValid)
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
}
db.Entry(employee).State = EntityState.Modified;
try
{
db.SaveChanges();
}
catch (DbUpdateConcurrencyException ex)
{
return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
}
return Request.CreateResponse(HttpStatusCode.OK);
}
// POST: api/Employees
public HttpResponseMessage PostEmployee(Employee employee)
{
if (!ModelState.IsValid)
{
db.Employees.Add(employee);
db.SaveChanges();
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, employee);
response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = employee.EmployeeID }));
return response;
}
else
{
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
}
}
// DELETE: api/Employees/5
public HttpResponseMessage DeleteEmployee(Employee employee)
{
Employee remove_employee = db.Employees.Find(employee.EmployeeID);
if (remove_employee == null)
{
return Request.CreateResponse(HttpStatusCode.NotFound);
}
db.Employees.Remove(remove_employee);
try
{
db.SaveChanges();
}
catch (DbUpdateConcurrencyException ex)
{
return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
}
return Request.CreateResponse(HttpStatusCode.OK);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose();
}
base.Dispose(disposing);
}
private bool EmployeeExists(int id)
{
return db.Employees.Count(e => e.EmployeeID == id) > 0;
}
}

Create a new HTML page in the project where we implemented Kendo Grid with the CRUD operation, to test the REST API Service after publishing the Application.

EmployeeGrid.html

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.3.1316/styles/kendo.common.min.css" />
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.3.1316/styles/kendo.default.min.css" />
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.3.1316/styles/kendo.dataviz.min.css" />
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.3.1316/styles/kendo.dataviz.default.min.css" />
<script src="http://cdn.kendostatic.com/2014.3.1316/js/jquery.min.js"></script>
<script src="http://cdn.kendostatic.com/2014.3.1316/js/kendo.all.min.js"></script>
<title></title>
</head>
<body>
<script>
$(document).ready(function () {
dataSource = new kendo.data.DataSource({
transport: {
read:
{
url: "/api/Employees",
dataType: "json",
},
destroy:
{
url: "/api/Employees",
type: "DELETE"
},
create:
{
url: "api/Employees",
type:"POST"
},
update:
{
url: "api/Employees",
type: "PUT",
parameterMap: function (options, operation) {
if (operation !== "read" && options.models) {
return {
models: kendo.stringify(options.models)
};
}
}
},
},
schema:
{
model:
{
id: "EmployeeID",
fields: {
EmployeeID: { editable: false, nullable: true, type: "number" },
FirstName: { editable: true, nullable: true, type: "string" },
LastName: { editable: true, nullable: true, type: "string" },
}
}
}
});
$("#grid1").kendoGrid({
dataSource:dataSource,
editable: "inline",
toolbar: ["create"],
columns: [
{
field: "EmployeeID",
title: "Employee ID",
},
{
field: "FirstName",
title: "First Name"
},
{
field: "LastName",
title:"Last Name"
},
{
command: ["edit",
{
name: "destroy",
text: "remove",
}
],
}
],
height: "500px",
pageable: {
refresh: true,
pageSizes: true,
buttonCount: 5
},
}).data("kendoGrid");
});
</script>
<div class="main-content">
<div id="grid1"></div>
</div>
</body>
</html>

Now, it’s time to publish the app.

solution explorer

Right click on the project in Solution Explorer and click Publish.

Select recently created Web app for the Application and click OK.

Check the ApplicationDbContext and EmployeeEntities and click Next.