BWPM/BlazorApp/Shared/NavMenu.razor

@using Microsoft.AspNetCore.Components
@using Microsoft.AspNetCore.Http
@using Radzen.Blazor
@using Microsoft.AspNetCore.Authorization;
@using Microsoft.AspNetCore.Identity;

@using Syncfusion.Blazor.Navigations
@using BWPMModels
@using Newtonsoft.Json
@inject UserManager<IdentityUser> _UserManager
@inherits LayoutComponentBase
@inject ExampleService ExampleService
@inject ThemeState ThemeState
@inject NavigationManager UriHelper
@inject IJSRuntime JSRuntime
@inject IHttpContextAccessor httpContextAccessor

@if (Theme != "default.css")
{
    <link href="_content/Radzen.Blazor/css/@(Theme)" rel="stylesheet" />
}
<RadzenDialog />
<RadzenNotification />
<RadzenTooltip />
<RadzenContextMenu />

<RadzenHeader>
    <ChildContent>
        <div class="row justify-content-start align-items-center">
            <div class="col-6 d-flex align-items-center">
                <RadzenSidebarToggle Click="@(args => { sidebarExpanded = !sidebarExpanded; bodyExpanded = !bodyExpanded; })">
                </RadzenSidebarToggle>
                <RadzenLabel Text="Radzen Blazor Components">
                </RadzenLabel>
            </div>
            <div class="col-6 d-flex align-items-center justify-content-end">
                <label class="d-none d-sm-inline-block" style="margin-left: 1rem">Theme:</label>
                <RadzenDropDown style="margin:0 .5rem" TValue="string" TextProperty="Text" ValueProperty="Value" Data="@themes" Value="@ThemeState.CurrentTheme" Change="@ChangeTheme" />
            </div>
        </div>
    </ChildContent>
</RadzenHeader>
<div style="width:100%">
    <RadzenBody @ref="@body0" @bind-Expanded="@bodyExpanded">
        <ChildContent>
            <RadzenContentContainer Name="main">
                @Body
            </RadzenContentContainer>
        </ChildContent>
    </RadzenBody>
</div>

<RadzenSidebar @ref="@sidebar0" @bind-Expanded="@sidebarExpanded">
    <ChildContent>
        <RadzenPanelMenu>
            <AuthorizeView Roles="Administrators">
                <Authorized>
                    @foreach (var Menuentry in AdminMenu)
                        {
                    <RadzenPanelMenuItem @bind-Expanded="Menuentry.Expanded" Text="Menuentry.Name" Path="MenuEntry.Path" Icon="MenuEntry.Icon">
                    </RadzenPanelMenuItem>
                    }
                    <RadzenPanelMenuItem Text="Abmelden" Path="/identity/account/logout" Icon=""></RadzenPanelMenuItem>
                </Authorized>
                <NotAuthorized>
                    <RadzenPanelMenuItem Text="Anmelden" Path="/identity/account/login" Icon=""></RadzenPanelMenuItem>
                </NotAuthorized>
            </AuthorizeView>
        </RadzenPanelMenu>
      
    </ChildContent>
</RadzenSidebar>
<RadzenFooter>
    <ChildContent>
        <RadzenLabel Text="Radzen Blazor Components, Copyright &copy; 2020">
        </RadzenLabel>
        <RadzenLink Text="[source]" Path="https://github.com/radzenhq/radzen-blazor" Target="_blank" Style="margin-left:5px;vertical-align:bottom;" />
    </ChildContent>
</RadzenFooter>
@code {


    RadzenSidebar sidebar0;
    RadzenBody body0;
    bool sidebarExpanded = true;
    bool bodyExpanded = false;

    dynamic themes = new[]
    {
    new { Text = "Default", Value = "default"},
    new { Text = "Dark", Value="dark" },
    new { Text = "Software", Value = "software"},
    new { Text = "Humanistic", Value = "humanistic" }
    };

    IEnumerable<BlazorApp.Models.MenuItem> AdminMenu;

    string Theme
    {
        get
        {
            return $"{ThemeState.CurrentTheme}.css";
        }
    }



    protected override void OnInitialized()
    {


        if (httpContextAccessor != null && httpContextAccessor.HttpContext != null &&
             httpContextAccessor.HttpContext.Request != null && httpContextAccessor.HttpContext.Request.Headers.ContainsKey("User-Agent"))
        {
            var userAgent = httpContextAccessor.HttpContext.Request.Headers["User-Agent"].FirstOrDefault();
            if (!string.IsNullOrEmpty(userAgent))
            {
                if (userAgent.Contains("iPhone") || userAgent.Contains("Android") || userAgent.Contains("Googlebot"))
                {
                    sidebarExpanded = false;
                    bodyExpanded = true;
                }
            }
        }

        System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");

    }


    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (!firstRender)
        {
            var example = ExampleService.FindCurrent(UriHelper.ToAbsoluteUri(UriHelper.Uri));

        }
    }


    void ChangeTheme(object value)
    {
        ThemeState.CurrentTheme = value.ToString();
        UriHelper.NavigateTo(UriHelper.ToAbsoluteUri(UriHelper.Uri).ToString());
    }

    public class CustomMenuItem
    {
        public string Id { get; set; }
        public string Text { get; set; }
        public string ParentId { get; set; }
        public string Url { get; set; }
    } 
}