<li class="nav-item @GetActive("", NavLinkMatch.All)">
    <NavLink class="nav-link" href="" Match="NavLinkMatch.All">Home</NavLink>
</li>

@code {

    [Inject]
    NavigationManager NavigationManager { get; set; }

    protected override void OnInitialized() => NavigationManager.LocationChanged += (s, e) => StateHasChanged();

    bool IsActive(string href, NavLinkMatch navLinkMatch = NavLinkMatch.Prefix)
    {
        var relativePath = NavigationManager.ToBaseRelativePath(NavigationManager.Uri).ToLower();
        return navLinkMatch == NavLinkMatch.All ? relativePath == href.ToLower() : relativePath.StartsWith(href.ToLower());
    }

    string GetActive(string href, NavLinkMatch navLinkMatch = NavLinkMatch.Prefix) => IsActive(href, navLinkMatch) ? "active" : "";
}