How to add link parameter to asp tag helpers in ASP.NET Core

1. Using AnchorTagHelper with URL Parameters

To add a link parameter to an ASP.NET Core tag helper, such as the AnchorTagHelper, use the asp-route-* attributes. The AnchorTagHelper generates an anchor (<a>) tag, and by adding asp-route-{parameterName} attributes, you can dynamically pass values for route variables in your HTML tags.

For example, asp-route-id="5" would pass an id parameter with a value of 5 to the route.

This generates a URL like /Product/GetProduct/5, where id is the parameter and 5 is its value.

2. Using Query String Parameters

If you want to add query string parameters (e.g., ?param=value), you can use the asp-route-* attribute with the route and append the query parameters.

This would generate a URL like /Home/Search?query=test.

3. Combining Route Parameters and Query String Parameters

You can combine both route parameters and query string parameters in the same link:

This will generate a URL like /Product/Details/10?category=electronics.

4. Dynamically Set Link Parameters

If you want to dynamically set a parameter, you can use a variable or model property:

5. Using asp-area with Route Parameters

If you are using areas in your ASP.NET Core, you can also specify the area along with route parameters:

This generates a link like /Admin/Product/Edit/123.