URL Routing

URL is a feature in ASP.NET that allows you to define friendly and meaningful URLs for your web application. It enables you to map URLs to specific resources or within your application, making the URLs more user-friendly and easier to remember.

URL Routing is particularly useful when you want to clean and search optimized URLs. Instead of having long and URLs with strings, you can have shorter and more descriptive URLs that are easier to read and understand.

Example:

Let's say you have a web application that manages products. URL Routing, the URL to view a specific product might look like this:


https://example.com/Product.aspx?productId=123

With URL Routing, you can define a route that maps the URL to a specific page or . For example, you can define a route that maps the URL “/products/{productId}” to the “Product.aspx” page, {productId} is a placeholder for the actual product ID.


routes.MapPageRoute("ProductRoute", "products/{productId}", "~/Product.aspx");

Now, when a user visits the URL “https://example.com/products/123”, the request will be routed to the “Product.aspx” page, and the value “123” will be passed as the productId parameter. This allows you to retrieve the product details and display them on the page.

URL Routing also supports additional features such as constraints, which allow you to specify rules for the values that can be used in the URL placeholders. For example, you can define a constraint to only allow numeric values for the productId placeholder.


routes.MapPageRoute("ProductRoute", "products/{productId}", "~/Product.aspx", constraints: new { productId = @"d+" });

In this example, the constraint @”d+” ensures that only numeric values are accepted for the productId placeholder. If a user tries to access a URL like “https://example.com/products/abc”, the routing engine will not match this route and may return a 404 error.

Overall, URL Routing in ASP.NET provides a flexible and powerful way to define and manage your application's URLs, making them more user-friendly and SEO-friendly.

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