Web API is a programming interface which exposes endpoints
that define request and response eco system. Each method can contain in
different types of request like POST, GET, PUT, DELETE etc. request should be
based the way which the API is built.
Here Is the simple example to create simple POST method that
inserts some data into database using Entity framework.
1.
Create new Project with WEB API as below
This will create the new project
of WEBAPI in MVC framework.
2.
Right Click on the controllers and add new WEB API
Controller as shown below.
Name your WEB API controller accordingly, I have named it as
EmployeeController.
3.
Right click on the Model folder and add ADO.NET
Entity Data Model as shown below.
Entity
Data Model wizard asks you to select what the model should contain, Select EF
designer from Database as shown below.
Click
on Next and Choose Data Connection by selecting new connection.
After Clicking New Connection, it
will prompt the new popup to enter server details, userid, password and
selecting the database.
After test connection is successful
click on OK and your connection string will get generated as shown below
Select the Entity framework version
and Click the Next button
Select the Table that is necessary for accessing the data as
shown below.
Click on Finish that will
generate the EDMX file with table name and columns as shown below.
4.
On EmployeeController.cs we can find multiple
functions remove all the except POST
method and replace the code as below.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using FirstWebApiDemo.Models;
namespace FirstWebApiDemo.Controllers
{
public class EmployeeController : ApiController
{
public HttpResponseMessage Post([FromBody]EmployeeDetail employee)
{
try
{
using (ACT2_MINIQEntities entities = new ACT2_MINIQEntities())
{
entities.EmployeeDetails.Add(employee);
entities.SaveChanges(); //inserts data in to DB
var message = Request.CreateResponse(HttpStatusCode.Created, employee); //Setting Response Headers
return message; //Returns Http Response
}
}
catch (Exception exception)
{
//handling Exceptions
return
Request.CreateErrorResponse(HttpStatusCode.BadRequest, exception);
}
}
}
}
To Test Output Use Fiddler Or POSTMAN Rest-client.
Output :
