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HttpContextExtensions ​

The HttpContextExtensions class provides helper extension methods for HttpContext in ASP.NET Core applications. These methods make it easy to detect devices, build URLs, check user authentication, and work with routes in a clean, reusable way.

Methods ​

IsMobileDevice ​

Signature:

csharp
public static bool IsMobileDevice(this HttpContext httpContext)

Description: Detects if the current request comes from a mobile device by checking the User-Agent header against common mobile patterns.

Returns:true if the request is from a mobile device; otherwise, false.

Example:

csharp
if (HttpContext.IsMobileDevice()) {
    // Serve mobile-specific content
}

GetAbsoluteRoute ​

Signature:

csharp
public static string GetAbsoluteRoute(this HttpContext httpContext, string relativeUrl)

Description: Combines the scheme, host, and given relative URL to build a complete absolute URL.

Returns: The fully qualified URL as a string.

Example:

csharp
var absoluteUrl = HttpContext.GetAbsoluteRoute("images/logo.png");
// e.g. https://example.com/images/logo.png

GetCurrentUrl ​

Signature:

csharp
public static string GetCurrentUrl(this HttpContext httpContext)

Description: Returns the full URL of the current request, including the scheme, host, path, and query string.

Returns: A string with the complete current URL.

Example:

csharp
var currentUrl = httpContext.GetCurrentUrl();

GetRouteValueOrDefault ​

Signature:

csharp
public static object GetRouteValueOrDefault(this HttpContext httpContext, string routeValueKey)

Description: Retrieves the value of a specific route parameter or null if the key does not exist.

Returns: The route value if present; otherwise, null.

Example:

csharp
var id = HttpContext.GetRouteValueOrDefault("id");

IsUserAuthenticated ​

Signature:

csharp
public static bool IsUserAuthenticated(this HttpContext httpContext)

Description: Checks whether the current request’s user is authenticated.

Returns:true if the user is authenticated; otherwise, false.

Example:

csharp
if (HttpContext.IsUserAuthenticated()) {
    // Proceed with secure actions
}

IsCurrentPage ​

Signature:

csharp
public static bool IsCurrentPage(this HttpContext context, string action, string controller)

Description: Checks whether the current request matches a given controller and action name. Useful for navigation highlights or active page checks.

Returns:true if the current request matches both the specified controller and action; otherwise, false.

Example:

csharp
if (HttpContext.IsCurrentPage("Index", "Home")) {
    // Mark navigation link as active
}