In Razor views, the default behavior is to automatically encode HTML content to prevent potential security vulnerabilities like cross-site scripting (XSS) attacks. However, sometimes you have legitimate HTML content (e.g., from a rich text editor or a trusted source) that you want to render as-is, without encoding. This is where Html.Raw() comes in.
Purpose Bypass HTML Encoding: Html.Raw() prevents Razor from encoding the HTML content you provide, allowing it to be rendered directly in the browser. Displaying Trusted HTML: Use it when you trust the source of the HTML content and want to preserve its formatting and structure. Dynamic Content Generation: Html.Raw() can be used to dynamically insert HTML fragments into your views based on data or logic.
Syntax @Html.Raw(htmlContent) where htmlContent is a string variable or expression containing the HTML you want to render without encoding.
Important Considerations Security Risk:Use Html.Raw() with extreme caution. If the htmlContent originates from user input or an untrusted source, it could lead to XSS vulnerabilities. Always sanitize and validate user-generated content before rendering it with Html.Raw(). Content Security Policy (CSP): Consider implementing a CSP to further mitigate XSS risks. A CSP defines a set of rules that govern how the browser handles external scripts, styles, and other resources.
Code @{ // … (other variables and logic) … string alertMessage = $”<script>alert(‘{people.Count} people found’)</script>”; }
<!DOCTYPE html> <html> <head> </head> <body> @Html.Raw(alertMessage) <h1>Welcome</h1> @for (int i = 0; i < 2; i++) { // … (rest of the view code) … } </body> </html> In this code: Raw HTML String: The variable alertMessage contains a string of HTML that includes a <script> tag intended to display an alert message with the number of people found.
Html.Raw() Usage: The @Html.Raw(alertMessage) line tells Razor to render the contents of alertMessage directly into the HTML output without encoding. This will result in the following HTML in the output: <script>alert(‘3 people found’)</script>
Client-Side Execution: When the browser parses this HTML, it will execute the JavaScript code inside the <script> tag, triggering an alert box.
No sanitization: In this example, since the number of people is not user input, there is no risk of XSS attack. However, if the content of the alert message is coming from user input, it is essential to santize it before displaying it to prevent XSS attacks.
By
No Comments
Local Functions in Razor Views in Asp.net Core MVC