ASP NET Razor C# Syntax

Sanitizing user input is difficult, avoid using HtmlHelper.Raw on user input. Another important feature of dynamic web pages is that you can read user
input. We create a form that posts to our OnPost handler, along with an input for Name.

• In this example, we create a new razor page “Get Employee” which displays the First Name of the employee for the given Id.
• In Razor Pages, a for loop is prepended by the @ symbol followed by a set of conditions wrapped in parentheses.
• Right-click on the Pages folder, select Add and then select Razor Page as shown in the below image.
• In Razor Pages, a foreach loop is prepended by the @ symbol followed by a set of conditions wrapped in parentheses.
• After storage, we want to redirect the page to the OnGet handler of our page.

See Strongly typed models and the @model keyword for more information. The generated file contains code to set up the main layout for the application. Razor allows you to write a mix of HTML and server-side code using C# or Visual Basic. Razor view with visual basic syntax has .vbhtml file extension and C# syntax has .cshtml file extension. Razor is a markup syntax for embedding server based code into web pages. Files containing Razor generally have a .cshtml file extension.

Razor code blocks¶

The @model directive specified the type of this property (by specifying the T in RazorPage that the generated class for your page derives from). If you don’t specify the @model directive the Model property will be of type dynamic. The value of the model is passed from the controller to the view.

• By
  running on the server, the code can perform complex tasks, like accessing
  databases.
• Razor keywords can be escaped with @(Razor Keyword), for example @(functions).
• Razor is a markup syntax for embedding server based code into web pages.
• Once you add the above code within the _Layout.cshtml file, your code should look as shown below.
• This will result in a new Razor Pages application being created which should be identical to the one generated via the command line.
• Redirecting is an essential part of web development, as it avoids the additional POST requests when we refresh a URL in our browser session.

Razor supports C# and uses the @ symbol to transition from HTML to C#. Razor evaluates C# expressions and renders them in the HTML output. Razor can transition from HTML into C# or into Razor specific markup. When an @ symbol is followed by a Razor reserved keyword it transitions into Razor specific markup, otherwise it transitions into plain C# . A database record
might have a FirstName and a LastName property (among others). The Pages folder is the default location for Razor Pages files.

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Sample application to understand how the verb Get() works in razor pages. In this example, we create a new razor page “Get Employee” which displays the First Name of the employee for the given Id. Click on the highlighted button to start debugging the project using the Kestrel web server which is enabled by default in ASP.NET core projects. This course will teach you how to build modern web applications using Razor Pages. You’ll learn how to implement common design patterns, build pages and layouts, work with forms and data, configure and deploy apps, and much more.

• Sanitizing user input is difficult, avoid using HtmlHelper.Raw on user input.
• Razor is based
  on ASP.NET, and designed
  for creating web applications.
• All aspects of code blocks (transitioning to markup, inline C#) also apply to the following structures.
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• In order for the page to be treated as a Razor Page, and have ASP.NET parse the view syntax with the Razor engine, the directive @page should be added at the top of the file.
• Our next step is to implement our OnPost method, which will process our incoming form data, and assign it to our TempData property.
• A partial consists of fragments of HTML and server-side code to be included in any number of pages or layouts.

A partial consists of fragments of HTML and server-side code to be included in any number of pages or layouts. In Razor Pages, you can use the ViewData property to pass data from a Page Model to its corresponding view page, as well as share it with the layout, and any partial views. In order for the page to be treated as a Razor Page, and have ASP.NET parse the view syntax with the Razor engine, the directive @page should be added at the top of the file. ASP.NET web pages with Razor syntax have the special file extension cshtml
(Razor using C#) or vbhtml (Razor using VB).

Anatomy of a Razor Pages application

Create a constructor which takes a parameter “List” within the “EmployeeModel” class. Create some data for the collection as shown in the below image. Once you click on the Add button, it will create Employee.cshtml page within the Pages folder as shown in the below image. The Get () verb takes an Id parameter and returns the First Name of the employee. To keep things simple, we are using the in-memory collection as the data source.

Declare a variable in a code block enclosed in brackets and then use those variables inside HTML with @ symbol. Our next step is to implement our OnPost method, which will process our incoming form data, and assign it to our TempData property. After storage, we want to redirect the page to the OnGet handler of our page. Redirecting is razor engine .net core an essential part of web development, as it avoids the additional POST requests when we refresh a URL in our browser session. Once you add the above code within the _Layout.cshtml file, your code should look as shown below. Partial views are an effective way of breaking up large views into smaller components and reduce complexity.

Razor View Data

These are paired with Razor files and are known as PageModel files. Some Razor files have a leading underscore (_) in their file name. These files are not browsable, but they perform distinct roles as part of a Razor Pages application. You can read more about these special Razor files and their roles. In Razor Pages, a foreach loop is prepended by the @ symbol followed by a set of conditions wrapped in parentheses.