Simplifying Razor logic with C# Local Functions in Asp.Net Core | blog.hildenco.com

LocalFunctions-Razor-AspNetCore.cshtml

@using Microsoft.AspNetCore.Mvc.Controllers
@{ 
    var controllerName = ((ControllerActionDescriptor)ViewContext.ActionDescriptor).ControllerName;
    string GetClass(string controller)
    {
        return $"nav-link { (controllerName == controller ? "active admin" : "" ) }";
    }
}

<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <a class="p-2 bg-info text-white mr-3" asp-area="Admin" asp-controller="Home" asp-action="Index">Admin</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarColor01" aria-controls="navbarColor01" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse">
        <ul class="navbar-nav mr-auto">
            <li class="nav-item">
                <a class="@GetClass("Properties")" asp-controller="Properties" asp-action="Index">Properties</a>
            </li>
            <li class="nav-item">
                <a class="@GetClass("Meetings")" asp-controller="Meetings" asp-action="Index">Meetings</a>
            </li>
            <li class="nav-item">
                <a class="@GetClass("Users")" asp-controller="Users" asp-action="Index">Users</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#" onclick="alert('todo'); return false;">Action Items</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#" onclick="alert('todo'); return false;">Communications</a>
            </li>
        </ul>
    </div>
</nav>

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