URL Rewriting in MVC 4 (attribute routing)

Now we are going to discuss about url rewring using web API's . According to new release of Web API2 , they implemented new type of url rewring called as 'attribute routing' which uses attribute to define routes. Attribute routing gives you more controle over URLs. Using this you can easly creates uls that defines your resouce heirarchi

Before attribute rouing WebAPIs use convention-base routing which is not able to support all kinds of url structure for example the below type of urls

/customers/1/orders

This type of urls which is difficult to create'' using convention-base routing

But it is very eazy to create with attribute routing you can simle give the structure as attributes like below

[Route("customers/{customerId}/orders")]
public IEnumerable<Order> GetOrdersByCustomer(int customerId) { ... }

For enabling the attribute routing need to add the following code ton WebApiConfig class which is fount in App_start folder

public static class WebApiConfig

{

public static void Register(HttpConfiguration config)

{

config.Routes.MapHttpRoute(

name: "DefaultApi",

routeTemplate: "api/{controller}/{id}",

defaults: new { id = RouteParameter.Optional }

);

}

}

and in your controller add the Route attributes

public class OrdersController : Controller
{
    [Route("customers/{customerId}/orders")]
    [HttpGet]
    public IEnumerable<Order> FindOrdersByCustomer(int customerId) { ... }
}

Note:- if Route trhrows exception , then you need to install new web api pakages for mvc

Install-Package AttributeRouting (for MVC)

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String is mutable

We heared that many times but most of us not know what that means..,

I am trying to explain what is mutable and what is immutable..

Mutable and immutable are mearly just eglish words as the meaning of these words

'Can change' and 'Cannot change'.

Like that a sting is immutable

that means a if we define a stirng its will create a

sting object ,if we change the value of our sting then

also create another sting object. If we try to concat it will also create

another string object.