O'Reilly Media, Inc. Programming Razor, the image of a parrotfish, and related trade dress are trade- . For example: “Programming Razor by Jess Chadwick. Take Razor for a test drive and discover first hand how this scripting syntax simplifies the way you create dynamic, data-driven websites. Contribute to chuchu/podmimokongist.ml development by creating an account on GitHub.
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This chapter gives you an overview of programming with podmimokongist.ml Web Pages using the Razor syntax. podmimokongist.ml is Microsoft's technology for. Free PDF Books, Download Books, free Lectures Notes, Papers and eBooks related to programming, computer Programming Razor – FreePdfBook. PDF. Take Razor for a test drive and discover first hand how this scripting syntax simplifies the way you create dynamic, data-driven websites. With this concise guide.
You can find more details about most of these programming techniques later in the article. Without HTML encoding, the output from your server code might not display correctly, and could expose a page to security risks.
You enclose code blocks in braces A code block includes one or more code statements and is enclosed in braces. Inside a block, you end each code statement with a semicolon Inside a code block, each complete code statement must end with a semicolon.
Inline expressions don't end with a semicolon. You use variables to store values You can store values in a variable, including strings, numbers, and dates, etc. You create a new variable using the var keyword. You can insert variable values directly in a page using. You enclose literal string values in double quotation marks A string is a sequence of characters that are treated as text. NET pages. Code is case sensitive In C , keywords like var, true, and if and variable names are case sensitive.
The following lines of code create two different variables, lastName and LastName. Note In Visual Basic, keywords and variables are not case sensitive. Much of your coding involves objects An object represents a thing that you can program with — a page, a text box, a file, an image, a web request, an email message, a customer record database row , etc. Objects have properties that describe their characteristics and that you can read or change — a text box object has a Text property among others , a request object has a Url property, an email message has a From property, and a customer object has a FirstName property.
Objects also have methods that are the "verbs" they can perform.
Examples include a file object's Save method, an image object's Rotate method, and an email object's Send method. You'll often work with the Request object, which gives you information like the values of text boxes form fields on the page, what type of browser made the request, the URL of the page, the user identity, etc.
MapPath Request. You can write code that makes decisions A key feature of dynamic web pages is that you can determine what to do based on conditions. The most common way to do this is with the if statement and optional else statement. Along with if statements, there are a variety of ways to test conditions, repeat blocks of code, and so on, which are described later in this article. In general, the first time a user requests a page, the page is requested using GET.
If the user fills in a form and then clicks a submit button, the browser makes a POST request to the server. In web programming, it's often useful to know whether a page is being requested as a GET or as a POST so that you know how to process the page.
In ASP. If the request is a POST, the IsPost property will return true, and you can do things like read the values of text boxes on a form. Many examples you'll see show you how to process the page differently depending on the value of IsPost. A Simple Code Example This procedure shows you how to create a page that illustrates basic programming techniques.
In the example, you create a page that lets users enter two numbers, then it adds them and displays the result.
In your editor, create a new file and name it AddNumbers. Copy the following code and markup into the page, replacing anything already in the page. The block at the top of the page is enclosed in braces. In the block at the top, all lines end with a semicolon. The variables total, num1, num2, and totalMessage store several numbers and a string.
The literal string value assigned to the totalMessage variable is in double quotation marks. Because the code is case-sensitive, when the totalMessage variable is used near the bottom of the page, its name must match the variable at the top exactly.
The expression num1. AsInt shows how to work with objects and methods. The AsInt method on each variable converts the string entered by a user to a number an integer so that you can perform arithmetic on it.
When the page is submitted, the if IsPost test evaluates to true and the conditional code runs, displaying the result of adding the numbers. Save the page and run it in a browser.
Make sure the page is selected in the Files workspace before you run it. Enter two whole numbers and then click the Add button.
NET web programming. It isn't an exhaustive examination, just a quick tour through the programming concepts you'll use most often. Even so, it covers almost everything you'll need to get started with ASP. But first, a little technical background. NET Razor syntax is a simple programming syntax for embedding server-based code in a web page. In a web page that uses the Razor syntax, there are two kinds of content: client content and server code.
If there's server code in the page, the server runs that code first, before it sends the page to the browser.
By running on the server, the code can perform tasks that can be a lot more complex to do using client content alone, like accessing server-based databases. Most importantly, server code can dynamically create client content — it can generate HTML markup or other content on the fly and then send it to the browser along with any static HTML that the page might contain. From the browser's perspective, client content that's generated by your server code is no different than any other client content.
As you've already seen, the server code that's required is quite simple. NET web pages that include the Razor syntax have a special file extension. The server recognizes these extensions, runs the code that's marked with Razor syntax, and then sends the page to the browser. Where does ASP. NET fit in? Razor syntax is based on a technology from Microsoft called ASP. NET, which in turn is based on the Microsoft. NET Framework. NET Framework is a big, comprehensive programming framework from Microsoft for developing virtually any type of computer application.
NET is the part of the.
NET Framework that's specifically designed for creating web applications. Developers have used ASP. NET to create many of the largest and highest-traffic websites in the world.
Any time you see the file-name extension. NET Core application. NET Core. Razor Pages makes use of the popular C programming language for server-side programming, and the easy-to-learn Razor templating syntax for embedding C in HTML markup to generate content for browsers dynamically. Who should use Razor Pages? Razor Pages is suitable for all kinds of developers from beginners to enterprise level. NET Web Forms.
It is also relatively easy for the beginner to learn, and it includes all of the advanced features of ASP. NET Core making it just as suitable for large, scalable, team-based projects. How to get Razor Pages Razor Pages is included within. NET Core from version 2. The SDK includes the runtime and command line tools for creating. NET Core applications.
The runtime is used to run. The Runtime-only installation is intended for use on machines where no development takes place. Why should you use Razor Pages?