BlazorApp.sln.DotSettings.user

@@ -1,4 +1,5 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:String x:Key="/Default/CodeInspection/ExcludedFiles/FilesAndFoldersToSkip2/=7020124F_002D9FFC_002D4AC3_002D8F3D_002DAAB8E0240759_002Ff_003ABoolean_002Ecs_002Fl_003A_002E_002E_003F_002E_002E_003F_002E_002E_003FLibrary_003FApplication_0020Support_003FJetBrains_003FRider2024_002E2_003Fresharper_002Dhost_003FSourcesCache_003Fabfadfcf168b17dd25ad62a3a2b89c89b9a3587ade1ccf7d80e4740274ef_003FBoolean_002Ecs/@EntryIndexedValue">ForceIncluded</s:String>
 	<s:String x:Key="/Default/CodeInspection/ExcludedFiles/FilesAndFoldersToSkip2/=7020124F_002D9FFC_002D4AC3_002D8F3D_002DAAB8E0240759_002Ff_003AComponentBase_002Ecs_002Fl_003A_002E_002E_003F_002E_002E_003F_002E_002E_003FLibrary_003FApplication_0020Support_003FJetBrains_003FRider2024_002E2_003Fresharper_002Dhost_003FDecompilerCache_003Fdecompiler_003F0691f2c61b694470b2385ca13b1109b2ddc00_003Ffb_003F9d185c09_003FComponentBase_002Ecs/@EntryIndexedValue">ForceIncluded</s:String>
 	<s:String x:Key="/Default/CodeInspection/ExcludedFiles/FilesAndFoldersToSkip2/=7020124F_002D9FFC_002D4AC3_002D8F3D_002DAAB8E0240759_002Ff_003ATask_002Ecs_002Fl_003A_002E_002E_003F_002E_002E_003F_002E_002E_003FLibrary_003FApplication_0020Support_003FJetBrains_003FRider2024_002E2_003Fresharper_002Dhost_003FSourcesCache_003F35f3a54f5acb408a3e219b2de039f1a39557b7e4515f11238cba07b60c0ce_003FTask_002Ecs/@EntryIndexedValue">ForceIncluded</s:String>
 	<s:String x:Key="/Default/CodeInspection/ExcludedFiles/FilesAndFoldersToSkip2/=7020124F_002D9FFC_002D4AC3_002D8F3D_002DAAB8E0240759_002Ff_003AThrowHelper_002Ecs_002Fl_003A_002E_002E_003F_002E_002E_003F_002E_002E_003FLibrary_003FApplication_0020Support_003FJetBrains_003FRider2024_002E2_003Fresharper_002Dhost_003FSourcesCache_003F6780d13016c376c4491c5618b257d84da7eacf747ed2719783e775546b79b_003FThrowHelper_002Ecs/@EntryIndexedValue">ForceIncluded</s:String>

BlazorApp/Components/Layout/NavMenu.razor

@@ -37,5 +37,12 @@
                 <span class="oi oi-list-rich" aria-hidden="true"></span> Validation
             </NavLink>
         </div>
+
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="blog">
+                <span class="oi oi-list-rich" aria-hidden="true"></span> Blog
+            </NavLink>
+        </div>
+        
     </nav>
 </div>

BlazorApp/Components/Pages/BlogPage/Blog.razor

@@ -0,0 +1,56 @@
+@page "/blog"
+@rendermode InteractiveServer
+
+<h3>Blog</h3>
+
+@* 
+Dependency Injection (DI)를 사용하는 블로그 앱
+   
+   목표: Blazor의 DI 패턴을 이해하고 데이터 관리
+   
+   포인트
+   • @inject 사용
+   • 서비스 라이프사이클 관리 (싱글턴, 트랜지언트, 스코프드)
+   
+   설명: 블로그 포스트를 추가, 삭제, 수정할 수 있는 간단한 블로그 앱을 만들어보세요. 데이터를 관리하는 서비스 클래스를 DI로 주입해 데이터를 처리합니다.
+
+ *@
+
+@if (BlogService.Instance.ReadPosts() == null || BlogService.Instance.ReadPosts().Count == 0)
+{
+    <p>No posts available.</p>
+}
+else
+{
+    <ul>
+        @foreach (var post in BlogService.Instance.ReadPosts())
+        {
+            <li>
+                <h4>@post.Title</h4>
+                <p>@post.Content</p>
+                
+                
+                <button disabled="@(isEdit)" @onclick="() => EditPost(post.Id)">Edit</button>
+                <button disabled="@(isEdit)" @onclick="() => RemovePost(post.Id)">Delete</button>
+            </li>
+        }
+    </ul>
+}
+<hr />
+
+@* *@
+<h3>@(isEdit ? "Edit Post" : "Add New Post")</h3>
+@* *@
+
+<div class="form-group">
+    <label>Title:</label>
+    <InputText @bind-Value="title" />
+</div>
+@* *@
+<div class="form-group">
+    <label>Content:</label>
+    <InputTextArea @bind-Value="content" />
+</div>
+@* *@
+<button @onclick = "SavePost">@(isEdit ? "Done" : "Add")</button>
+

BlazorApp/Components/Pages/BlogPage/Blog.razor.cs

@@ -0,0 +1,102 @@
+using BlazorApp.PrefixCSharp;
+using Microsoft.AspNetCore.Components;
+
+
+namespace BlazorApp.Components.Pages.BlogPage;
+
+public class PostItem
+{
+    public int Id { get; set; }
+    public string Title { get; set; }
+    public string Content { get; set; }
+}
+
+
+public partial class Blog : ComponentBase
+{
+    // BlogService BS = BlogService.Instance;
+
+    // private PostItem post = new PostItem();
+    private string title = string.Empty;
+    private string content = string.Empty;
+    private int id = 0;
+    private bool isEdit = false;
+
+    public void SavePost()
+    {
+        if (isEdit)
+        {
+            Console.WriteLine(this.id);
+            EditPost(this.id);
+        }
+        else
+        {
+            PostItem post = new PostItem
+            {
+                Title = this.title,
+                Content = this.content
+            };
+            CreatePost(post);
+        }
+
+    
+        title = string.Empty;
+        content = string.Empty;
+    }
+    public void CreatePost(PostItem post)
+    {
+        BlogService.Instance.CreatePost(post);
+        BlogService.Instance.ReadPosts();
+    }
+
+    public void RemovePost(int id)
+    {
+        BlogService.Instance.DeletePost(id);
+    }
+
+    public void EditPost(int id)
+    {
+        isEdit = Prefix.Toggle(isEdit);
+        if (isEdit)
+        {
+            PostItem post = BlogService.Instance.ReadPost(id);
+            title = post.Title;
+            content = post.Content;
+            this.id = post.Id;
+        }
+        else
+        {
+            BlogService.Instance.UpdatePost(BlogService.Instance.ReadPost(id),this.title, this.content);
+        }
+    }
+    
+}
+
+
+public class Singleton
+{
+    // Lazy 선언으로 사용시에만 객체를 생성하게 하면서 외부에서 접근할 수 없는 단일 인스턴스를 저장한다.
+    private static Lazy<Singleton> _instance = new Lazy<Singleton>(() => new Singleton());
+
+    // 외부에서 해당 인스턴스에 접근하려면 이 속성을 통해서만 접근이 가능
+    public static Singleton Instance => _instance.Value;
+
+    private int value = 0;
+
+    // 싱글턴이니까 외부에서 인스턴스 생성 불가하게
+    private Singleton()
+    {
+    }
+
+    public int DoSomething(int value)
+    {
+        Console.WriteLine("DO SINGLETON");
+        this.value++;
+        return this.value + value;
+    }
+
+    public void checkValue()
+    {
+        Console.WriteLine($"CHECK VALUE:{this.value}");
+    }
+}

BlazorApp/Components/Pages/BlogPage/Blog.razor.css

@@ -0,0 +1,14 @@
+.form-group {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    margin-bottom: 10px;
+}
+
+
+.form-group label {
+    width: 100px;
+    text-align: right;
+    margin-right: 10px;
+    padding-right: 4px;
+}

BlazorApp/Components/Pages/BlogPage/BlogService.cs

@@ -0,0 +1,54 @@
+namespace BlazorApp.Components.Pages.BlogPage;
+
+public class BlogService
+{
+    private static Lazy<BlogService> _instance = new Lazy<BlogService>(() => new BlogService());
+
+    public static BlogService Instance = _instance.Value;
+    
+    private List<PostItem> posts = new List<PostItem>();
+    private BlogService() {
+        
+    }
+
+    public void CreatePost(PostItem post)
+    {
+        if(posts.Count > 0)
+            post.Id = posts[^1].Id + 1;
+        else 
+            post.Id = 1;
+        
+        posts.Add(post);
+    }
+    
+    public List<PostItem> ReadPosts()
+    {
+        foreach (var post in posts)
+            Console.WriteLine($"READ {post.Id} : {post.Title} = {post.Content}");
+        return this.posts;
+    }
+
+    public PostItem ReadPost(int id)
+    {
+        foreach (var post in posts)
+        {
+            if (post.Id == id)
+                return post;
+        }
+        return null;
+    }
+
+    public void UpdatePost(PostItem post,string title, string content)
+    {
+        post.Title = title;
+        post.Content = content;
+    }
+
+
+    public void DeletePost(int id)
+    {
+        PostItem post = ReadPost(id);
+        posts.Remove(post);
+    }
+    
+}

BlazorApp/Components/Pages/TodoPage/Todo.razor.cs

@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Components;
 
 namespace BlazorApp.Components.Pages.TodoPage
 {
+    
     public partial class Todo : ComponentBase
     {
         private List<TodoItem> todos = new();
@@ -37,6 +38,7 @@ namespace BlazorApp.Components.Pages.TodoPage
 
         private void ToggleTodo(TodoItem todo, int index)
         {
+
             if (todo.IsDone)
             {
                 todo.SuccessDate = string.Empty;

BlazorApp/Components/Pages/ValidationPage/Validation.razor.css

@@ -6,7 +6,6 @@
     margin-bottom: 10px;
 }
 
-
 .form-group label {
     width: 100px;
     text-align: right;
@@ -21,8 +20,10 @@
 
 .form-actions {
     display: flex;
-    justify-content: center;
+    flex-grow: 1;
+    /*justify-content: flex-end;*/
     margin-top: 10px;
+    width: 100%;
 }
 
 .success-message {

BlazorApp/obj/Debug/net8.0/BlazorApp.AssemblyInfo.cs

@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("BlazorApp")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+4781a17b00b8e21414f02e947102acf72c5c6178")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+22a9ed453132bd81e3b047b70a2c7c8fecf41cf5")]
 [assembly: System.Reflection.AssemblyProductAttribute("BlazorApp")]
 [assembly: System.Reflection.AssemblyTitleAttribute("BlazorApp")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

BlazorApp/obj/Debug/net8.0/BlazorApp.AssemblyInfoInputs.cache

@@ -1 +1 @@
-d6262563cb144b1b24689bcb852f66331e78b742afea34cc7526f77806d8fefb
+0de9e1463f1e76d9de8902e22e93a1f278b71d472a502e3acfe4ed33a0f2e63e

BlazorApp/obj/Debug/net8.0/BlazorApp.GeneratedMSBuildEditorConfig.editorconfig

@@ -54,6 +54,10 @@ build_metadata.AdditionalFiles.CssScope = b-fekawvbbds
 build_metadata.AdditionalFiles.TargetPath = Q29tcG9uZW50cy9MYXlvdXQvTmF2TWVudS5yYXpvcg==
 build_metadata.AdditionalFiles.CssScope = b-zswk0q6kaa
 
+[/Users/seankim/1.Program/Project(ASP)/BlazorApp/BlazorApp/Components/Pages/BlogPage/Blog.razor]
+build_metadata.AdditionalFiles.TargetPath = Q29tcG9uZW50cy9QYWdlcy9CbG9nUGFnZS9CbG9nLnJhem9y
+build_metadata.AdditionalFiles.CssScope = b-yzv2llfl6l
+
 [/Users/seankim/1.Program/Project(ASP)/BlazorApp/BlazorApp/Components/Pages/TodoPage/Todo.razor]
 build_metadata.AdditionalFiles.TargetPath = Q29tcG9uZW50cy9QYWdlcy9Ub2RvUGFnZS9Ub2RvLnJhem9y
 build_metadata.AdditionalFiles.CssScope = b-n64y2ur3f8

BlazorApp/obj/Debug/net8.0/BlazorApp.csproj.CoreCompileInputs.cache

@@ -1 +1 @@
-50edfd86d0e1da31fa31883ae82e1f3520bbce7f4aabb52fd74698655be3fe0f
+ef301e20d32eb1a6f2108ec68675e157089016ae7ab00873f44aef4cee05680c

BlazorApp/obj/Debug/net8.0/BlazorApp.csproj.FileListAbsolute.txt

@@ -33,3 +33,4 @@
 /Users/seankim/1.Program/Project(ASP)/BlazorApp/BlazorApp/obj/Debug/net8.0/ref/BlazorApp.dll
 /Users/seankim/1.Program/Project(ASP)/BlazorApp/BlazorApp/obj/Debug/net8.0/scopedcss/Components/Pages/TodoPage/Todo.razor.rz.scp.css
 /Users/seankim/1.Program/Project(ASP)/BlazorApp/BlazorApp/obj/Debug/net8.0/scopedcss/Components/Pages/ValidationPage/Validation.razor.rz.scp.css
+/Users/seankim/1.Program/Project(ASP)/BlazorApp/BlazorApp/obj/Debug/net8.0/scopedcss/Components/Pages/BlogPage/Blog.razor.rz.scp.css

BlazorApp/obj/Debug/net8.0/scopedcss/Components/Pages/BlogPage/Blog.razor.rz.scp.css

@@ -0,0 +1,14 @@
+.form-group[b-yzv2llfl6l] {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    margin-bottom: 10px;
+}
+
+
+.form-group label[b-yzv2llfl6l] {
+    width: 100px;
+    text-align: right;
+    margin-right: 10px;
+    padding-right: 4px;
+}

BlazorApp/obj/Debug/net8.0/scopedcss/Components/Pages/TodoPage/Todo.razor.rz.scp.css

@@ -1,5 +1,4 @@
 
-/* todo 용 CSS */
 .list-item[b-n64y2ur3f8] {
     display: flex;
     align-items: center;

BlazorApp/obj/Debug/net8.0/scopedcss/Components/Pages/ValidationPage/Validation.razor.rz.scp.css

@@ -6,7 +6,6 @@
     margin-bottom: 10px;
 }
 
-
 .form-group label[b-z8q1q1jnjv] {
     width: 100px;
     text-align: right;
@@ -21,8 +20,10 @@
 
 .form-actions[b-z8q1q1jnjv] {
     display: flex;
-    justify-content: center;
+    flex-grow: 1;
+    /*justify-content: flex-end;*/
     margin-top: 10px;
+    width: 100%;
 }
 
 .success-message[b-z8q1q1jnjv] {

BlazorApp/obj/Debug/net8.0/scopedcss/bundle/BlazorApp.styles.css

@@ -206,6 +206,21 @@ main[b-fekawvbbds] {
         overflow-y: auto;
     }
 }
+/* _content/BlazorApp/Components/Pages/BlogPage/Blog.razor.rz.scp.css */
+.form-group[b-yzv2llfl6l] {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    margin-bottom: 10px;
+}
+
+
+.form-group label[b-yzv2llfl6l] {
+    width: 100px;
+    text-align: right;
+    margin-right: 10px;
+    padding-right: 4px;
+}
 /* _content/BlazorApp/Components/Pages/TodoPage/Todo.razor.rz.scp.css */
 
 .list-item[b-n64y2ur3f8] {
@@ -266,7 +281,6 @@ main[b-fekawvbbds] {
     margin-bottom: 10px;
 }
 
-
 .form-group label[b-z8q1q1jnjv] {
     width: 100px;
     text-align: right;
@@ -281,8 +295,10 @@ main[b-fekawvbbds] {
 
 .form-actions[b-z8q1q1jnjv] {
     display: flex;
-    justify-content: center;
+    flex-grow: 1;
+    /*justify-content: flex-end;*/
     margin-top: 10px;
+    width: 100%;
 }
 
 .success-message[b-z8q1q1jnjv] {

BlazorApp/obj/Debug/net8.0/scopedcss/projectbundle/BlazorApp.bundle.scp.css

@@ -206,6 +206,21 @@ main[b-fekawvbbds] {
         overflow-y: auto;
     }
 }
+/* _content/BlazorApp/Components/Pages/BlogPage/Blog.razor.rz.scp.css */
+.form-group[b-yzv2llfl6l] {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    margin-bottom: 10px;
+}
+
+
+.form-group label[b-yzv2llfl6l] {
+    width: 100px;
+    text-align: right;
+    margin-right: 10px;
+    padding-right: 4px;
+}
 /* _content/BlazorApp/Components/Pages/TodoPage/Todo.razor.rz.scp.css */
 
 .list-item[b-n64y2ur3f8] {
@@ -266,7 +281,6 @@ main[b-fekawvbbds] {
     margin-bottom: 10px;
 }
 
-
 .form-group label[b-z8q1q1jnjv] {
     width: 100px;
     text-align: right;
@@ -281,8 +295,10 @@ main[b-fekawvbbds] {
 
 .form-actions[b-z8q1q1jnjv] {
     display: flex;
-    justify-content: center;
+    flex-grow: 1;
+    /*justify-content: flex-end;*/
     margin-top: 10px;
+    width: 100%;
 }
 
 .success-message[b-z8q1q1jnjv] {

BlazorApp/ㅎNETCORE 학습/공부 방향.md

@@ -191,3 +191,7 @@ WebAssembly의 개념을 이해하고, Blazor를 사용하여 클라이언트
 ## **결론**
 
 이미 다양한 개발 경험과 기본기를 갖추고 계신 만큼, .NET Core와 Blazor, EF6를 체계적으로 학습하신다면 빠르게 실력을 향상시킬 수 있을 것입니다. 제안드린 단계별 학습 방법을 따라가며, 실습과 프로젝트를 통해 이론을 실제로 적용해보세요. 학습 과정에서 궁금한 점이나 어려운 부분이 생기면 언제든지 질문해 주세요. 성공적인 학습과 개발 여정을 응원합니다! 화이팅하세요!
+
+
+
+ex, 경로탐색 알고리즘, 충돌회피 알고리즘, 교통 트래픽 분산 알고리즘 트래픽 잼 탈출 알고리즘 등

BlazorApp/ㅎNETCORE 학습/추가적으로 알게 되는 내용.md

@@ -24,3 +24,55 @@
 - 코드에서 어떤 동작이나 정보를 제공하거나, 특정 조건에 따라 처리되는 방식을 지정할 수 있다.
 - 이미 존재하는(Required, Range, Obsolte, 등) 속성들도 있지만, 사용자가 직접 정의해서 사용할 수 있다.
 - 2의 EditForm과 엮으면 좋음
+
+## 4. Dependency Injection (DI)
+- 의존성 관리를 쉽게 하기 위한 설계 패턴으로 객체가 필요로 하는 의존성을 직접 생성하지 않고,<br>
+  외부에서 주입해주는 방식으로 객체 간 결합도를 줄이고 테스트 가능성과 유연성을 높이는 역할을 한다.
+- 의존성(Dependency)란?
+  - 간단하게 한 객체가 다른 객체의 기능, 데이터를 필요로 할 때 이를 의존성이라고 한다.
+  - A 클래스가 B 클래스의 기능을 사용하면 A는 B에 의존한다고 보면 된다.
+- 핵심 개념
+  - 제어 역전(inversion of Control) : DI도 결국 이 개념의 한 형태로서<br>
+    전통적으로 객체는 스스로 필요한 의존성을 직접 생성하지만 DI에서는 외부에서 의존성 주입해 객체간 결합도 줄임
+  - 느슨한 결합 : DI는 클래스 간 결합도 낮추는 방법으로 객체가 다른 객체의 구체적 구현에 의존하지 않고 인터페이스나 추상 클래스에 의존하게 한다.<br>
+    그로 인해 시스템의 유지보수성과 확장성을 높인다.
+
+## 5. 싱글턴 패턴
+- 가장 유명하고 자주 쓰이면서 남발하면 절대 안되는 패턴
+```csharp
+public class Singleton
+{
+    // Lazy 선언으로 사용시에만 객체를 생성하게 하면서 외부에서 접근할 수 없는 단일 인스턴스를 저장한다.
+    private static Lazy<Singleton> _instance = new Lazy<Singleton>(() => new Singleton());
+
+    // 외부에서 해당 인스턴스에 접근하려면 이 속성을 통해서만 접근이 가능
+    public static Singleton Instance => _instance.Value;
+
+    private int value = 0;
+
+    // 싱글턴이니까 외부에서 인스턴스 생성 불가하게
+    private Singleton()
+    {
+        // 초기화 
+    }
+
+    public int DoSomething(int value)
+    {
+        // 그냥 아무 동작이나
+        Console.WriteLine("DO SINGLETON");
+        this.value++;
+        return this.value + value;
+    }
+}
+
+public class Base 
+{
+    private void CheckSingle()
+    {
+        Singleton ton1 = Singleton.Instance;
+        Singleton ton2 = Singleton.Instance;
+        if (ton1 == ton2)
+            Console.WriteLine("Same");
+    }
+}    
+```