bitforum/backend/Views/Shared/_MenuItem.cshtml

@model bitforum.Constants.Menu;
@inject Microsoft.AspNetCore.Http.IHttpContextAccessor HttpContextAccessor

@{
    // 현재 요청 경로 가져오기
    var currentPath = HttpContextAccessor.HttpContext?.Request?.Path.ToString()?.TrimEnd('/');

    // 고정된 메뉴 경로
    var menuPath = (Model.Path?.TrimEnd('/') ?? string.Empty);

    // 활성화 여부 확인
    var isActive = !string.IsNullOrEmpty(currentPath) && !string.IsNullOrEmpty(menuPath) &&
                   (currentPath.Equals(menuPath, StringComparison.OrdinalIgnoreCase) ||
                    currentPath.StartsWith(menuPath + "/", StringComparison.OrdinalIgnoreCase) ||
                    menuPath.StartsWith(currentPath + "/", StringComparison.OrdinalIgnoreCase));
}
<li class="nav-item">
    <a href="@Model.Path" class="nav-link @(isActive ? "active" : "")"
        @Html.Raw(Model.Children != null && Model.Children.Any() ? "data-bs-toggle=\"collapse\"" : "")
        @Html.Raw(Model.Children != null && Model.Children.Any() ? $"data-bs-target=\"#menu-{Model.Id}\"" : "")
    >
        @if (!string.IsNullOrEmpty(Model.Icon))
        {
            @Html.Raw(Model.Icon);
        }

        @Model.Name
    </a>

    @if (Model.Children != null && Model.Children.Any())
    {
        <ul id="menu-@Model.Id" class="nav flex-column flex-nowrap ps-3 collapse">
            @foreach (var child in Model.Children)
            {
                @Html.Partial("_MenuItem", child);
            }
        </ul>
    }
</li>