Update the project

ExportCustomization/ExportCustomization/App.razor → App.razor

@@ -1,10 +1,12 @@
-<Router AppAssembly="@typeof(Program).Assembly">
+<Router AppAssembly="@typeof(App).Assembly">
     <Found Context="routeData">
         <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
     </Found>
     <NotFound>
+        <PageTitle>Not found</PageTitle>
         <LayoutView Layout="@typeof(MainLayout)">
-            <p>Sorry, there's nothing at this address.</p>
+            <p role="alert">Sorry, there's nothing at this address.</p>
         </LayoutView>
     </NotFound>
 </Router>

ExportCustomization/ExportCustomization/Data/WeatherForecast.cs → Data/WeatherForecast.cs

@@ -1,15 +1,13 @@
-using System;
-
-namespace ExportCustomization.Data
+namespace ExportingCustomization.Data
 {
     public class WeatherForecast
     {
-        public DateTime Date { get; set; }
+        public DateOnly Date { get; set; }
 
         public int TemperatureC { get; set; }
 
         public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
 
-        public string Summary { get; set; }
+        public string? Summary { get; set; }
     }
-}
+}

Data/WeatherForecastService.cs

@@ -0,0 +1,20 @@
+namespace ExportingCustomization.Data
+{
+    public class WeatherForecastService
+    {
+        private static readonly string[] Summaries = new[]
+        {
+        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+    };
+
+        public Task<WeatherForecast[]> GetForecastAsync(DateOnly startDate)
+        {
+            return Task.FromResult(Enumerable.Range(1, 5).Select(index => new WeatherForecast
+            {
+                Date = startDate.AddDays(index),
+                TemperatureC = Random.Shared.Next(-20, 55),
+                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
+            }).ToArray());
+        }
+    }
+}