state management

BlazorApp/BlazorStateApp/Data/CounterState.cs

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+namespace BlazorStateApp.Data
+{
+    public class CounterState
+    {
+        private int _count = 0;
+
+        public Action OnStateChanged;
+
+        public int Count
+        {
+            get { return _count; }
+            set
+            {
+                _count = value;
+                Refresh();
+            }
+        }
+
+        private void Refresh()
+        {
+            this.OnStateChanged?.Invoke();
+        }
+    }
+}

BlazorApp/BlazorStateApp/Data/WeatherForecast.cs

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+namespace BlazorStateApp.Data
+{
+    public class WeatherForecast
+    {
+        public DateTime Date { get; set; }
+
+        public int TemperatureC { get; set; }
+
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+        public string? Summary { get; set; }
+    }
+}

BlazorApp/BlazorStateApp/Data/WeatherForecastService.cs

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+namespace BlazorStateApp.Data
+{
+    public class WeatherForecastService
+    {
+        private static readonly string[] Summaries = new[]
+        {
+        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+    };
+
+        public Task<WeatherForecast[]> GetForecastAsync(DateTime 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());
+        }
+    }
+}