MeiRiYiCheng_1_old/YBDevice.Web/Pages/Old/RouteParameter.razor

@page "/RouteParameter/{text?}"
<h3>Blazor is @Text!</h3>

@code {
    [Parameter]
    public string? Text { get; set; }

    protected override void OnParametersSet()
    {
        Text = Text ?? "test";
    }
}