Parameters

A parameter makes it possible to send a value to a component. To add a parameter to a component, we use the [Parameter] attribute on the public property:

@code {
    [Parameter]
    public int MyParameter { get; set; }
}

We can also do the same using a code-behind file. We can add a parameter using the @page directive by specifying it in the route:

@page "/parameterdemo/{MyParameter}"

In this case, we have to have a parameter specified with the same name as the name inside the curly braces. To set the parameter in the @page directive, we go to /parameterdemo/THEVALUE.

There are cases where we want to specify another type instead of a string (string is the default). We can add the data type after the parameter name like this:

@page "/parameterdemo/{MyParameter:int}"

This will match the route only if the data type is an integer. We can also pass parameters using cascading parameters.

Cascading parameters

If we want...