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我已经阅读了有关此主题的几篇文章，但经过数小时仍找不到解决方案。

我无法弹出 NavMenu.razor 中的子菜单。

我尝试的每个解决方案都不起作用。

我什至直接从 Bootstrap4 复制了示例，如下面的代码所示，但它不起作用。

除此之外，菜单完美无缺。

    <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-dark bg-primary fixed-top">

    <div class="d-none d-sm-block" style="padding:0 20px 0 0;">
        <img src="/Client/Images/CompanyLogo.jpg" alt="Company logo" style="width:100%; height:40px; padding:0 0 0 5px; margin:0" ; />
    </div>

    <button class="navbar-toggler" @onclick="ToggleNavMenu" type="button" data-toggle="collapse" data-target=".navbar-collapse" aria-controls="navbarSupportedContent"
            aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="@NavMenuCssClass navbar-collapse d-sm-inline-flex flex-sm-row-reverse" @onclick="CollapseNavMenu">
        <ul class="navbar-nav flex-grow-1">
            <li class="nav-item">
                <a class="nav-link text-light" href="" Match="NavLinkMatch.All">Home</a>
            </li>

            <li class="nav-item">
                <a class="nav-link text-light" href="\PurchaseOrders\OrderMain">Orders</a>
            </li>

            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Dropdown
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <div class="dropdown-divider"></div>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
        </ul>
    </div>
</nav>

@code {
    bool collapseNavMenu = true;

    string NavMenuCssClass => collapseNavMenu ? "collapse" : null;

    void ToggleNavMenu()
    {
        collapseNavMenu = !collapseNavMenu;
    }

    void CollapseNavMenu()
    {
        collapseNavMenu = true;
    }
}
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