dependency injection

BlazorApp/BlazorApp/Data/FastFoodService.cs

@@ -0,0 +1,16 @@
+namespace BlazorApp.Data
+{
+    public class FastFoodService : IFoodService
+    {
+        public IEnumerable<Food> GetFoods()
+        {
+            List<Food> foods = new List<Food>()
+            {
+                new Food() { Name = "감자튀김", Price = 1500 },
+                new Food() { Name = "햄버거", Price = 6000 },
+            };
+
+            return foods;
+        }
+    }
+}

BlazorApp/BlazorApp/Data/Food.cs

@@ -0,0 +1,8 @@
+namespace BlazorApp.Data
+{
+    public class Food
+    {
+        public string Name { get; set; }
+        public int Price { get; set; }
+    }
+}

BlazorApp/BlazorApp/Data/FoodService.cs

@@ -0,0 +1,17 @@
+namespace BlazorApp.Data
+{
+    public class FoodService : IFoodService
+    {
+        public IEnumerable<Food> GetFoods()
+        {
+            List<Food> foods = new List<Food>()
+            {
+                new Food() { Name = "비빔밥", Price = 9000 },
+                new Food() { Name = "김밥", Price = 4000 },
+                new Food() { Name = "쫄면", Price = 7000 },
+            };
+
+            return foods;
+        }
+    }
+}

BlazorApp/BlazorApp/Data/IFoodService.cs

@@ -0,0 +1,7 @@
+namespace BlazorApp.Data
+{
+    public interface IFoodService
+    {
+        public IEnumerable<Food> GetFoods();
+    }
+}

BlazorApp/BlazorApp/Data/PaymentService.cs

@@ -0,0 +1,12 @@
+namespace BlazorApp.Data
+{
+    public class PaymentService
+    {
+        private IFoodService _service;
+
+        public PaymentService(IFoodService service)
+        {
+            _service = service;
+        }
+    }
+}

BlazorApp/BlazorApp/Data/SingletonService.cs

@@ -0,0 +1,47 @@
+namespace BlazorApp.Data
+{
+    public class SingletonService : IDisposable
+    {
+        public Guid ID { get; set; }
+
+        public SingletonService()
+        {
+            ID = Guid.NewGuid();
+        }
+
+        public void Dispose()
+        {
+            Console.WriteLine($"SingletonService was disposed (Guid: {this.ID.ToString()})");
+        }
+    }
+
+    public class TransientService : IDisposable
+    {
+        public Guid ID { get; set; }
+
+        public TransientService()
+        {
+            ID = Guid.NewGuid();
+        }
+
+        public void Dispose()
+        {
+            Console.WriteLine($"TransientService was disposed (Guid: {this.ID.ToString()})");
+        }
+    }
+
+    public class ScopedService : IDisposable
+    {
+        public Guid ID { get; set; }
+
+        public ScopedService()
+        {
+            ID = Guid.NewGuid();
+        }
+
+        public void Dispose()
+        {
+            Console.WriteLine($"ScopedService was disposed (Guid: {this.ID.ToString()})");
+        }
+    }
+}

BlazorApp/BlazorApp/Data/WeatherForecastService.cs

@@ -4,8 +4,8 @@ namespace BlazorApp.Data
     {
         private static readonly string[] Summaries = new[]
         {
-        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-    };
+        };
 
         public Task<WeatherForecast[]> GetForecastAsync(DateTime startDate)
         {

BlazorApp/BlazorApp/Pages/Food.razor

@@ -0,0 +1,32 @@
+@page "/food"
+@using BlazorApp.Data;
+
+@inject IFoodService _foodService;
+@inject PaymentService _paymentService;
+
+@inject SingletonService _singleton;
+@inject ScopedService _scoped;
+@inject TransientService _transient;
+
+<h3>Food</h3>
+
+<div>
+    @foreach (var food in _foodService.GetFoods())
+    {
+        <div>@food.Name</div>
+        <div>@food.Price</div>
+    }
+</div>
+
+<div>
+    <h1>Singleton</h1>
+    <label>Guid: @_singleton.ID</label>
+    <h1>Scoped</h1>
+    <label>Guid: @_scoped.ID</label>
+    <h1>Transient</h1>
+    <label>Guid: @_transient.ID</label>
+</div>
+
+@code {
+
+}

BlazorApp/BlazorApp/Program.cs

@@ -15,6 +15,15 @@ namespace BlazorApp
             builder.Services.AddServerSideBlazor();
             builder.Services.AddSingleton<WeatherForecastService>();
 
+            // Dependency Injection
+            builder.Services.AddSingleton<IFoodService, FastFoodService>();
+            builder.Services.AddSingleton<PaymentService>();
+
+            // 3가지 모드
+            builder.Services.AddSingleton<SingletonService>(); // 서버 시작시
+            builder.Services.AddScoped<ScopedService>(); // 접속시
+            builder.Services.AddTransient<TransientService>(); // 요청시
+
             var app = builder.Build();
 
             // Configure the HTTP request pipeline.

BlazorApp/BlazorApp/Shared/NavMenu.razor

@@ -34,6 +34,11 @@
                 <span class="oi oi-flag" aria-hidden="true"></span> User
             </NavLink>
         </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="food">
+                <span class="oi oi-basket" aria-hidden="true"></span> Food
+            </NavLink>
+        </div>
     </nav>
 </div>