Culture Switching Methods Test on Blazor Server

CultureTestPage.Razor

@page "/"
@using System.Globalization

<h1>Blazor culture</h1>
<p>
    @_dateTime.ToString()<br />
    @_decimalNumber.ToString("N4");<br />
</p>

<h1>Specific culture</h1>
<p>
    @_dateTime.ToString(_currentCulture)<br />
    @_decimalNumber.ToString("N4", _currentCulture);<br />
</p>
<p>
    <button @onclick="@SwitchCultureWithDelayAsync">Switch Culture With Delay</button>
    <button @onclick="@SwitchCultureOnCompletedTaskAsync">Switch Culture Immediately</button>
</p>
<p>
    <button @onclick="@SwitchCultureWithDelayNoInvokeAsync">Switch Culture With Delay (No Invoke)</button>
    <button @onclick="@SwitchCultureOnCompletedTaskNoInvokeAsync">Switch Culture Immediately (No Invoke)</button>
</p>

@code {
    private DateTime _dateTime = DateTime.Now;
    private decimal _decimalNumber = 9876.54321M;

    private readonly CultureInfo _enCulture = CultureInfo.CreateSpecificCulture("en-US");
    private readonly CultureInfo _esCulture = CultureInfo.CreateSpecificCulture("es-ES");
    private CultureInfo _currentCulture = null;

    protected override void OnInitialized()
    {
        CultureInfo.CurrentCulture = _enCulture;
        base.OnInitialized();
    }

    private void SwitchCulture()
    {
        var targetCulture = ReferenceEquals(_currentCulture, _enCulture) ? _esCulture : _enCulture;
        _currentCulture = targetCulture;
        CultureInfo.CurrentCulture = CultureInfo.CurrentUICulture = targetCulture;
    }

    private async Task SwitchCultureWithDelayAsync()
    {
        await InvokeAsync(async () =>
        {
            SwitchCulture();
            await Task.Delay(1000); // Don't return a completed task
        });
    }

    private async Task SwitchCultureOnCompletedTaskAsync()
    {
        await InvokeAsync(() =>
        {
            SwitchCulture();
            return Task.CompletedTask;
        });
    }

    private async Task SwitchCultureWithDelayNoInvokeAsync()
    {
        SwitchCulture();
        await Task.Delay(1000);
    }

    private Task SwitchCultureOnCompletedTaskNoInvokeAsync()
    {
        SwitchCulture();
        return Task.CompletedTask;
    }
}