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European Cloud ASP.NET MVC Hosting - Spain :: Pipeline in ASP.NET MVC

clock April 22, 2014 09:49 by author Scott

In this article, I will write simple tutorial about detail pipeline of ASP.NET MVC.

Routing

Routing is the first step in ASP.NET MVC pipeline. typically, it is a pattern matching system that matches the incoming request to the registered URL patterns in the Route Table.

The UrlRoutingModule(System.Web.Routing.UrlRoutingModule) is a class which matches an incoming HTTP request to a registered route pattern in the RouteTable(System.Web.Routing.RouteTable).

When ASP.NET MVC application starts at first time, it registers one or more patterns to the RouteTable to tell the routing system what to do with any requests that match these patterns. An application has only one RouteTable and this is setup in the Application_Start event of Global.asax of the application.

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

   routes.MapRoute(
   name: "Default",
   url: "{controller}/{action}/{id}",
   defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
   );
   }
   }


protected void Application_Start()
{
   //Other code is removed for clarity
   RouteConfig.RegisterRoutes(RouteTable.Routes);
}

When the UrlRoutingModule finds a matching route within RouteCollection (RouteTable.Routes), it retrieves the IRouteHandler(System.Web.Mvc.IRouteHandler) instance(default is System.Web.MvcRouteHandler) for that route. From the route handler, the module gets an IHttpHandler(System.Web.IHttpHandler) instance(default is System.Web.MvcHandler).

public interface IrouteHandler
{
   IHttpHandler GetHttpHandler(RequestContext requestContext);
}

Controller Initialization

The MvcHandler initiates the real processing inside ASP.NET MVC pipeline by using ProcessRequest method. This method uses the IControllerFactory instance (default is System.Web.Mvc.DefaultControllerFactory) to create corresponding controller.

protected internal virtual void ProcessRequest(HttpContextBase httpContext)
{
   SecurityUtil.ProcessInApplicationTrust(delegate {
   IController controller;
   IControllerFactory factory;
   this.ProcessRequestInit(httpContext, out controller, out factory);
   try
   {
   controller.Execute(this.RequestContext);
   }
   finally
   {
   factory.ReleaseController(controller);
   }
   });
}

Action Execution

1. When the controller is initialized, the controller calls its own InvokeAction() method by passing the details of the chosen action method. This is handled by the IActionInvoker.

public virtual bool InvokeAction(ControllerContext controllerContext, string actionName)

2. After chosen of appropriate action method, model binders(default is System.Web.Mvc.DefaultModelBinder) retrieves the data from incoming HTTP request and do the data type conversion, data validation such as required or date format etc. and also take care of input values mapping to that action method parameters.

3. Authentication Filter was introduced with ASP.NET MVC5 that run prior to authorization filter. It is used to authenticate a user. Authentication filter process user credentials in the request and provide a corresponding principal. Prior to ASP.NET MVC5, you use authorization filter for authentication and authorization to a user.

By default, Authenticate attribute is used to perform Authentication. You can easily create your own custom authentication filter by implementing IAuthenticationFilter.

4. Authorization filter allow you to perform authorization process for an authenticated user. For example, Role based authorization for users to access resources.

By default, Authorize attribute is used to perform authorization. You can also make your own custom authorization filter by implementing IAuthorizationFilter.

5. Action filters are executed before(OnActionExecuting) and after(OnActionExecuted) an action is executed. IActionFilter interface provides you two methods OnActionExecuting and OnActionExecuted methods which will be executed before and after an action gets executed respectively. You can also make your own custom ActionFilters filter by implementing IActionFilter.

6. When action is executed, it process the user inputs with the help of model (Business Model or Data Model) and prepare Action Result.

Result Execution

1. Result filters are executed before(OnResultnExecuting) and after(OnResultExecuted) the ActionResult is executed. IResultFilter interface provides you two methods OnResultExecuting and OnResultExecuted methods which will be executed before and after an ActionResult gets executed respectively. You can also make your own custom ResultFilters filter by implementing IResultFilter.

2. Action Result is prepared by performing operations on user inputs with the help of BAL or DAL. The Action Result type can be ViewResult, PartialViewResult, RedirectToRouteResult, RedirectResult, ContentResult, JsonResult, FileResult and EmptyResult.

3. Various Result type provided by the ASP.NET MVC can be categorized into two category- ViewResult type and NonViewResult type. The Result type which renders and returns an HTML page to the browser, falls into ViewResult category and other result type which returns only data either in text format, binary format or a JSON format, falls into NonViewResult category.

View Initialization and Rendering

1. ViewResult type i.e. view and partial view are represented by IView(System.Web.Mvc.IView) interface and rendered by the appropriate View Engine.

public interface Iview
{
  
void Render(ViewContext viewContext, TextWriter writer);
}

2. This process is handled by IViewEngine(System.Web.Mvc.IViewEngine) interface of the view engine. By default ASP.NET MVC provides WebForm and Razor view engines. You can also create your custom engine by using IViewEngine interface and can registered your custom view engine in to your Asp.Net MVC application as shown below:

protected void Application_Start()
{
  
//Remove All View Engine including Webform and Razor
   ViewEngines.Engines.Clear();
   //Register Your Custom View Engine
   ViewEngines.Engines.Add(new CustomViewEngine());
   //Other code is removed for clarity
}

3. Html Helpers are used to write input fields, create links based on the routes, AJAX-enabled forms, links and much more. Html Helpers are extension methods of the HtmlHelper class and can be further extended very easily. In more complex scenario, it might render a form with client side validation with the help of JavaScript or jQuery.



Free ASP.NET 5 MVC Belgium Hosting - HostForLIFE.eu :: Implementing Validation Mechanism in ASP.NET MVC

clock April 16, 2014 07:17 by author Peter

In this article I will walk you through the steps of implementing validation in the ASP.NET 5 MVC project using jquery.validate.unobtrusive.js

What is Unobtrusive JavaScript?

Unobtrusive JavaScript is the best practices to separate the JavaScript code from presentation or html.

For example
<input type=”button”
id=”btn”
onclick=”alert(‘hello world’)“
/>

The above code is obtrusive as we have called the JavaScript alert method within the html control’s input tag. In order to make this unobtrusive we can create a separate JavaScript file and with the help of jQuery we can register a click event for this button like this.

$(document).ready(function () {
$(‘#btn’).click(function (e) {
    alert(‘hello world’);
}
});

For validation there is a JavaScript named jquery.validate.unobtrusive.js which can automatically attach validation with all the input controls that you have in your html file. But those controls should have data-val attribute to true. Otherwise the validation for that particular control does not applied. By default, when we use these methods in our code, depending on the data annotation attributes we have used in our Model it automatically applies the validation at the time of rendering the html control.

For example. If our model is:

public
class
Person : Message
{
[GridColumn("Id", true)]
public
int Id { set; get; }
[Required]
[GridColumn("Name", false)]
[StringLength(10, ErrorMessage="Length cannot exceed to 10 character")]
public
string Name { set; get; }
}

In ASP.Net MVC we can associate a model while adding a view and in that view we can call HTML helper functions like this
@Html.EditorFor(model => model.Name)

This will generates an html as follows

<input data-val=”true” data-val-length=”Length cannot exceed to 10 character” data-val-length-max=”10″ data-val-required=”The Name field is required.” id=”Name” name=”Name” type=”text” value=”Ovais” />

1. You can see that depending on the model it has automatically added the data-val-* properties in the html. You have to add a jquery.validation.unobtrusive.js in your project.

2. Then add the file path in the bundle like this:

bundles.Add(new
ScriptBundle(“~/bundles/jqueryval”).Include(
“~/Scripts/jquery.validate*”)); 

3. Then add the script reference in the page as within the script section like this.

@section scripts{
@Scripts.Render(“~/bundles/jqueryval”)

}

4. Make sure you have controls place inside a form.

Handling validation in AJAX calls

When using server side post back in ASP.Net MVC validation works smooth. But for example if you want to invoke some AJAXified request on any button click and wanted to know if the form is validated or not you can add a code like this.

$(‘#Save’).click(function (e) {
var $val = $(this).parents(‘form’);
if (!($val.valid()))
return
false;
else alert(‘form have no errors’);

}



Europe FREE ASP.NET MVC 5 Hosting - UK :: ASP.NET MVC 5 Hosting with HostForLIFE.eu

clock April 11, 2014 08:17 by author Scott

ASP.NET MVC 5.0 Overview

What's Asp.net MVC 5.0? Asp.net MVC 5.0 is is the latest version of the popular ASP.NET MVC technology that enables you to build dynamic websites using the Model-View-Controller technology, with an emphasis on a clean architecture, test-driven development and extensibility.

What're the new features from Asp.net mvc 5.0?

The ASP.NET MVC 5 Framework is the latest update to Microsoft’s popular ASP.NET web platform. It provides an extensible, high-quality programming model that allows you to build dynamic, data-driven websites, focusing on a cleaner architecture and test-driven development.

ASP.NET MVC 5 contains a number of improvements over previous versions, including some new features, improved user experiences; native support for JavaScript libraries to build multi-platform CSS and HTML5 enabled sites and better tooling support.

Below are some of new ASP.NET MVC 5 feature:

  • Scaffolding
  • ASP.NET Identity 
  • One ASP.NET 
  • Bootstrap 
  • Attribute Routing 
  • Filter Overrides

Best ASP.NET MVC 5.0 hosting service

If you read over the asp.net official web pages you should have found the mvc 5.0 is still developer preview release but not final product. If you're web developers you can simply get it installed on local and take all the advantages, however you might find it hard to find a real hosting service for it. Why? Because reliability is final purpose for production server, most hosting providers would not take the risk using some beta version softwares because they need to be responsible to all clients. Any potential security hole may destroy the entire server. But, you don’t need to worry, HostForLIFE.eu will provide ASP.NET MVC 5 hosting on our shared hosting environment. You can test drive this new feature with only €3.00/month.

More about Asp.net MVC 5.0 Hosting with HostForLIFE.eu

Asp.net MVC 5.0 will be a simple support by all leading asp.net hosting providers as long as it's officially released. There's no special requirement to get MVC 5.0 working but just a simple installation on server end. However it doesn't mean every service will be as good as advertised. For best performance and security purpose, you should always host your mvc application with a reputable service where the hosting servers are setup with powerful hardware and windows OS(windows server 2008 R2 is minimum requirement). The hosting service must be easy to use with friendly hosting control panel. The crucial point is you can always view your website online so 99% uptime must be offered.

HostForLIFE.eu offering super cheap hosting solutions and leading hosting features, you get unlimited disk space and unlimited bandwith in same hosting account. You also get dedicated application pools per site and free domain name opportunity. With standard websitepanel you can manage website files/database/email accounts and all other asp.net website configurations without professional skills. HostForLIFE.eu is by far the best choice for cheap and reliable asp.net mvc 5 hosting.



HostForLIFE.eu Proudly Announces Microsoft SQL Server 2014 Hosting

clock April 7, 2014 11:09 by author Peter
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About HostForLIFE.eu

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