webapptemplates/BlazorServerApp-NET5/BlaServApp.UI/Shared/MainLayout.razor

@inherits LayoutComponentBase

@using BlaServApp.UI.Data
@using BlaServApp.UI.Components
@inject MessageService MessageService
@implements IDisposable

<div class="page">
    <div class="sidebar">
        <NavMenu />
    </div>

    <CascadingValue Name="ShowSearch" Value=@ShowSearch>
        <div class="main">
            <div class="top-row">
                <CmpTop></CmpTop>
            </div>
            <div class="content px-4 mb-5">
                @Body
            </div>
            <div class="fixed-bottom bottom-row">
                <CmpFooter></CmpFooter>
            </div>
        </div>
    </CascadingValue>
</div>

@code {
    bool ShowSearch { get; set; } = false;

    protected override void OnInitialized()
    {
        MessageService.EA_ShowSearch += OnShowSearch;
        MessageService.EA_HideSearch += OnHideSearch;
    }
    public void OnShowSearch()
    {
        ShowSearch = true;
        InvokeAsync(() =>
        {
            StateHasChanged();
        });
    }
    public void OnHideSearch()
    {
        ShowSearch = false;
        InvokeAsync(() =>
        {
            StateHasChanged();
        });
    }

    public void Dispose()
    {
        MessageService.EA_ShowSearch -= OnShowSearch;
        MessageService.EA_ShowSearch -= OnHideSearch;
    }

}