Program.cs

using System.Globalization;
using BlazorWebAssembly;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Microsoft.JSInterop;
using DevExpress.Blazor.Localization;
using BlazorWebAssembly.Services;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
builder.Services.AddDevExpressBlazor();
builder.Services.AddScoped<WeatherForecastService>();
builder.Services.AddLocalization();
builder.Services.AddSingleton(typeof(IDxLocalizationService), typeof(LocalizationService));

var app = builder.Build();
var jsInterop = app.Services.GetRequiredService<IJSRuntime>();
var result = await jsInterop.InvokeAsync<string>("blazorCulture.get");
if (result != null) {
    var culture = new CultureInfo(result);
    CultureInfo.DefaultThreadCurrentCulture = culture;
    CultureInfo.DefaultThreadCurrentUICulture = culture;
}


await app.RunAsync();