MainLayout.cs

@inherits BlazorLayoutComponent
@inject Microsoft.AspNetCore.Blazor.Services.IUriHelper UriHelper

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

<div class="main">
    <div class="top-row px-4">
        <input type="search" bind-value-oninput="@SearchTerm" onkeydown="@((e) => SearchKeyDown(e))" placeholder="Search..." />
    </div>

    <div class="content px-4">
        @Body
    </div>
</div>

@functions {
private string SearchTerm { get; set; }

private void SearchKeyDown(UIKeyboardEventArgs e)
{
    if (e.Key == "Enter")
    {
        this.StateHasChanged();
        UriHelper.NavigateTo($"/search/{SearchTerm}");
    }
}
}