vb net code 128 checksum Controller basics in .NET

Generation Code 128B in .NET Controller basics

Controller basics
Making Code128 In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create Code 128 Code Set A image in ASP.NET applications.
www.OnBarcode.com
Print Code 128 Code Set A In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create Code 128 Code Set C image in ASP.NET applications.
www.OnBarcode.com
The last line of the action returns the presentation model to a View helper method, which returns a ViewResult to the MVC Framework. Because a view name wasn t specified, the framework uses a convention and looks for a view that matches the action name. In this case it would look for a view called Index.
Barcode Generation In .NET
Using Barcode printer for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Linear Barcode Encoder In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Linear Barcode image in ASP.NET applications.
www.OnBarcode.com
Accepting input
Barcode Printer In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Generate EAN-13 Supplement 5 In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create EAN-13 Supplement 5 image in ASP.NET applications.
www.OnBarcode.com
An action method receives input from the web browser via its method arguments. The controller uses the model binder feature to convert values from web requests into CLR objects that match the names of parameters for the action method. The internals of how this works are covered in chapter 14. For now, it s important to understand that a convention is used to match form values by their name to the parameter name of an action. Listing 4.3 shows how an action method can accept values from the HTTP request as parameters.
Matrix Maker In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create 2D image in ASP.NET applications.
www.OnBarcode.com
Making UPC Shipping Container Symbol ITF-14 In .NET
Using Barcode creator for ASP.NET Control to generate, create DUN - 14 image in ASP.NET applications.
www.OnBarcode.com
Listing 4.3 A value object bound to an action from a route value
Code128 Maker In .NET
Using Barcode creation for VS .NET Control to generate, create Code128 image in .NET applications.
www.OnBarcode.com
Code-128 Generator In None
Using Barcode creator for Online Control to generate, create Code-128 image in Online applications.
www.OnBarcode.com
[HttpGet] public ActionResult Edit(int Id) { User user = UserRepository.GetById(Id); .... }
GS1 - 12 Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Encode Barcode In Visual C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
The code in listing 4.3 shows a value object being bound from a portion of the URL. The URL containing an Id with the value 4 would be http://localhost/User/Edit/4. The model binder automatically binds this value to the action s parameter. The action can then use the value to perform its work, as in the GetById method, without having to pull values out of the HttpContext. If an action method directly accesses the Request property to extract user input, this is a sign that the action has too many responsibilities. Actions need to be focused on the storyboard instead of translating input data. Listing 4.4 demonstrates an action method that accepts a complex type as a parameter. ASP.NET MVC will automatically convert the form values into CLR objects by matching on the property names.
Barcode Decoder In Visual Studio .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Generate Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Listing 4.4 A complex object bound to an action from a form post
Make Barcode In Visual Studio .NET
Using Barcode generation for .NET framework Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
Encoding Barcode In None
Using Barcode generator for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
public class UserInput { [Required] public string Username { get; set; } public string FirstName { get; set; } public string LastName { get; set; } } [HttpPost] public ActionResult Edit(UserInput input) { ... }
PDF 417 Scanner In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Data Matrix Recognizer In C#.NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Accepting input
QR Code Maker In VS .NET
Using Barcode generator for Reporting Service Control to generate, create QR Code JIS X 0510 image in Reporting Service applications.
www.OnBarcode.com
European Article Number 13 Printer In Java
Using Barcode creator for Java Control to generate, create EAN13 image in Java applications.
www.OnBarcode.com
In listing 4.4, the form post data is converted into a UserInput object. The Edit action method can accept the complex type as a parameter.
NOTE
Along with the MVC Framework, Microsoft has wrapped some of the ASP.NET code and provided abstract classes to some of the key APIs, such as HttpResponseBase, HttpRequestBase, and most importantly, HttpContextBase. A Google search will reveal how many people have had trouble testing against HttpContext because of its sealed and static members. Providing abstract classes for these key APIs loosens the coupling to them, increasing testability.
The resolution of action parameters used in conjunction with model binders makes it easy to craft an action method that takes in information from a web request. We can use the form values, route values, and query string to make the action behavior more dynamic. Again, notice how effortless it is to consume this request data. We don t have to write any repetitive code to pull these values in. Rather, the ASP.NET MVC Framework finds the correct input value and maps it to the appropriate action parameter.
Handling the successful storyboard path in an action
Now that you understand how actions accept user input, let s move on to implementing the application s storyboard. In the case of accepting user input from a form post, the decision to follow the success or alternate path can be made by data type validation. When the criteria for success are met, the action can coordinate the success activities and control the flow to the next screen or action. Listing 4.5 shows the implementation of the successful path of the Edit action.
Listing 4.5 The success path in an action
[HttpPost] public ActionResult Edit(UserInput input) Checks if validation { succeeded if (ModelState.IsValid) { UpdateUserFromInput(input); Redirects to TempData["message"] = "The user was updated"; Index action return RedirectToAction("index"); }
return View(input); } private void UpdateUserFromInput(UserInput input) { User user = UserRepository.GetByUsername(input.Username); user.FirstName = input.FirstName; user.LastName = input.LastName; UserRepository.Save(user); }
Copyright © OnBarcode.com . All rights reserved.