{"id":12240,"date":"2026-06-06T09:00:07","date_gmt":"2026-06-06T00:00:07","guid":{"rendered":"https:\/\/www.moonmile.net\/blog\/?p=12240"},"modified":"2026-06-05T17:44:47","modified_gmt":"2026-06-05T08:44:47","slug":"blazor-%e3%81%a7-addscoped-%e3%82%92%e4%bd%bf%e3%81%a3%e3%81%a6%e3%82%ab%e3%83%bc%e3%83%88%e6%a9%9f%e8%83%bd%e3%82%92%e4%bd%9c%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.moonmile.net\/blog\/archives\/12240","title":{"rendered":"Blazor \u3067 AddScoped \u3092\u4f7f\u3063\u3066\u30ab\u30fc\u30c8\u6a5f\u80fd\u3092\u4f5c\u308b"},"content":{"rendered":"\n

\u6ce8\u6587\u30b5\u30a4\u30c8\u306e\u3088\u3046\u306a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9\u306e Web \u30a2\u30d7\u30ea\u306e\u3068\u304d\u306b\u3001\u753b\u9762\u9077\u79fb\u3092\u3057\u3066\u3082\u30ab\u30fc\u30c8\u6a5f\u80fd\u306e\u30e1\u30e2\u30ea\u306e\u3088\u3046\u306b\u72b6\u614b\u3092\u4fdd\u6301\u3057\u3066\u304a\u304d\u305f\u3044\u3068\u304d\u304c\u60a9\u307f\u3069\u3053\u308d\u3067\u3059\u3002<\/p>\n\n\n\n

\u66f8\u7c4d\u306e\u307b\u3046 https:\/\/amzn.asia\/d\/0cim4yUX<\/a> \u3067\u306f\u629c\u3051\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u6240\u8b02\u300cASP.NET Core Blazor \u72b6\u614b\u7ba1\u7406\u306e\u6982\u8981 \u300dhttps:\/\/learn.microsoft.com\/ja-jp\/aspnet\/core\/blazor\/state-management\/?view=aspnetcore-10.0&source=recommendations<\/a> \u3042\u305f\u308a\u3092\u53c2\u8003\u306b\u3057\u3066\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u30ab\u30fc\u30c8\u6a5f\u80fd\u306e\u30b5\u30fc\u30d3\u30b9<\/strong><\/h2>\n\n\n\n

\u3044\u308f\u3086\u308b CartItem \u3092\u5185\u90e8\u306b\u6301\u3064\u30af\u30e9\u30b9\u3092\u4f5c\u308a\u307e\u3059\u3002<\/p>\n\n\n

\npublic class CartItem\n{\n    public int ProductId { get; set; }\n    public string Name { get; set; } = "";\n    public double Price { get; set; }\n    public int Quantity { get; set; }\n}\n\npublic class CartService\n{\n    private List<CartItem> _items = new();\n    public List<CartItem> Items\n    {\n        get => _items;\n    }\n    \/\/ \u30ab\u30fc\u30c8\u306b\u8ffd\u52a0\n    public void Add( int productId, string name, double price )\n    {\n        var existing = _items.FirstOrDefault(x => x.ProductId == productId);\n        if ( existing is not null ) \n        {\n            existing.Quantity++;\n        } \n        else\n        {\n            _items.Add(new CartItem { ProductId = productId, Name = name, Price = price, Quantity = 1 });\n        }\n\n    }\n    \/\/ \u30ab\u30fc\u30c8\u304b\u3089\u524a\u9664\n    public void Remove( int productId )\n    {\n        var existing = _items.FirstOrDefault(x => x.ProductId == productId);\n        if ( existing is not null )\n        {\n            _items.Remove( existing );\n        }\n    }\n    \/\/ \u30ab\u30fc\u30c8\u3092\u30af\u30ea\u30a2\n    public void Clear( )\n    {\n        _items.Clear();\n    }\n}\n<\/pre><\/div>\n\n\n
Razor \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u6a2a\u65ad\u3059\u308b\u305f\u3081\u306e CartService \u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3044\u308f\u3086\u308b\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306a\u30af\u30e9\u30b9\u3067\u3059\u3002React \u3084 Vue \u3042\u305f\u308a\u306a\u3089\u3070\u3001useState \u3068\u304b Pinia \u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3053\u308d\u3067\u3059\u3002<\/p>\n\n\n\n
Blazor \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u3072\u3068\u3064\u3060\u3051\u3042\u308c\u3070\u3044\u3044\u306e\u3067\u3001builder.Services.AddScoped \u3092\u4f7f\u3063\u3066\u8ffd\u52a0\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
Program.cs \u306b<\/p>\n\n\n
\nusing BlazorOrderApp.Components;\nusing BlazorOrderApp.Services;\n\nvar builder = WebApplication.CreateBuilder(args);\n\n\/\/ Add services to the container.\nbuilder.Services.AddRazorComponents()\n    .AddInteractiveServerComponents();\n\nbuilder.Services.AddScoped<CartService>(); \/\/ \u2605\u3053\u3053\u3092\u8ffd\u52a0\n\n<\/pre><\/div>\n\n\n
\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u5404 Razor \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u307b\u3046\u3067 @inject BlazorOrderApp.Services.CartService Cart \u306e\u3088\u3046\u306a\u5f62\u3067\u30ab\u30fc\u30c8\u6a5f\u80fd\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u53c2\u7167\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306f HttpClient \u306e\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u3067\u3082\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u300cASP.NET Core Blazor \u72b6\u614b\u7ba1\u7406\u306e\u6982\u8981\u300d\u306b\u3088\u308c\u3070\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8 builder.Services.AddSingleton \u306e\u3068\u304d\u3068\u30b5\u30fc\u30d0\u30fc uilder.Services.AddScoped \u306e\u3068\u304d\u3068\u3067\u5dee\u304c\u3067\u308b\u306e\u3067\u3001\u3053\u308c\u306f\u5f8c\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002\u5b9f\u306f JavaScript \u306e localStorage \u3092\u547c\u3073\u51fa\u3059\u30d1\u30bf\u30fc\u30f3\u3082\u5b9f\u88c5\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n
\u30ab\u30fc\u30c8\u753b\u9762 CartView.razor \u306e\u5b9f\u88c5<\/strong><\/h2>\n\n\n\n
CartService \u3092 injection \u3057\u3066\u30ab\u30fc\u30c8\u753b\u9762\u3092\u4f5c\u308a\u307e\u3059\u3002
\u5358\u54c1\u306e\u5897\u6e1b\u3068\u524a\u9664\u30dc\u30bf\u30f3\u3092\u3064\u3051\u307e\u3059\u3002<\/p>\n\n\n
\n@page "\/cart"\n@rendermode InteractiveServer\n@inject NavigationManager Navigation\n@inject HttpClient Http\n@inject IJSRuntime JSRuntime\n@inject BlazorOrderApp.Services.CartService Cart\n\n<div class="container py-4">\n    <div class="mb-4">\n        <h2 class="fw-bold text-danger">\ud83c\udf63 \u30ab\u30fc\u30c8\u4e00\u89a7<\/h2>\n    <\/div>\n    <div>\n        @foreach( var it in Cart.Items ) {\n            <div>@it.Name : @it.Price \u5186 \n                <button class="btn btn-primary" @onclick="() => Decriment(it)">-<\/button> \n                 @it.Quantity \u500b\n                <button class="btn btn-primary" @onclick="() => Incriment(it)" >+<\/button>\n                <button class="btn btn-danger" @onclick="() => Remove(it)" >\u524a\u9664<\/button>\n            <\/div>\n        }\n    <\/div>\n    <div>\n        \u5408\u8a08: @sum \u5186\n    <\/div>\n<\/div>\n\n\n@code {\n    private double sum  => Cart.Items.Sum( it => (int)it.Price * it.Quantity );\n\n    private void Incriment( Services.CartItem it ) {\n        if ( it.Quantity >= 8 ) return;\n        it.Quantity++;\n    }\n    private void Decriment( Services.CartItem it ) {\n        if ( it.Quantity <= 0 ) return  ;\n        it.Quantity--;\n    }\n    private void Remove(Services.CartItem it) {\n        Cart.Items.Remove( it );\n    }\n}\n<\/pre><\/div>\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\u3053\u306e\u72b6\u614b\u3067\u300c+\u300d\u30dc\u30bf\u30f3\u3068\u300c-\u300d\u30dc\u30bf\u30f3\u3001\u300c\u524a\u9664\u300d\u30dc\u30bf\u30f3\u306e\u52d5\u304d\u3092\u78ba\u8a8d\u3057\u3066\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u3063\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u305d\u306e\u5f8c\u3067\u3001Claude Code \u3092\u4f7f\u3063\u3066\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u76f4\u3057\u3002<\/p>\n\n\n
\n<div class="container py-4" style="max-width: 720px;">\n\n    <h2 class="fw-bold mb-4">\ud83c\udf63 \u30ab\u30fc\u30c8<\/h2>\n\n    @if (!Cart.Items.Any())\n    {\n        <div class="text-center text-muted py-5">\n            <p class="fs-5">\u30ab\u30fc\u30c8\u306b\u5546\u54c1\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n            <a href="\/" class="btn btn-outline-primary mt-2">\u30e1\u30cb\u30e5\u30fc\u3078\u623b\u308b<\/a>\n        <\/div>\n    }\n    else\n    {\n        <div class="card shadow-sm mb-4">\n            <ul class="list-group list-group-flush">\n                @foreach (var it in Cart.Items)\n                {\n                    <li class="list-group-item py-3">\n                        <div class="d-flex align-items-center gap-3">\n                            <div class="flex-grow-1">\n                                <span class="fw-semibold">@it.Name<\/span>\n                                <span class="text-muted ms-2">@it.Price \u5186<\/span>\n                            <\/div>\n                            <div class="d-flex align-items-center gap-2">\n                                <button class="btn btn-outline-secondary btn-sm" style="width:2rem;" @onclick="() => Decriment(it)">\u2212<\/button>\n                                <span class="fw-bold" style="min-width:1.5rem; text-align:center;">@it.Quantity<\/span>\n                                <button class="btn btn-outline-secondary btn-sm" style="width:2rem;" @onclick="() => Incriment(it)">\uff0b<\/button>\n                            <\/div>\n                            <div class="text-end" style="min-width:5rem;">\n                                <span class="fw-semibold">@((int)it.Price * it.Quantity) \u5186<\/span>\n                            <\/div>\n                            <button class="btn btn-outline-danger btn-sm" @onclick="() => Remove(it)">\u524a\u9664<\/button>\n                        <\/div>\n                    <\/li>\n                }\n            <\/ul>\n        <\/div>\n\n        <div class="card shadow-sm">\n            <div class="card-body d-flex justify-content-between align-items-center">\n                <span class="fs-5 fw-bold">\u5408\u8a08<\/span>\n                <span class="fs-4 fw-bold text-danger">@sum \u5186<\/span>\n            <\/div>\n            <div class="card-footer d-flex justify-content-end gap-2">\n                <a href="\/" class="btn btn-outline-secondary">\u8cb7\u3044\u7269\u3092\u7d9a\u3051\u308b<\/a>\n                <button class="btn btn-danger px-4">\u6ce8\u6587\u3059\u308b<\/button>\n            <\/div>\n        <\/div>\n    }\n\n<\/div>\n<\/pre><\/div>\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
AddSingleton \u306e\u6642\u306e\u554f\u984c<\/strong><\/h2>\n\n\n\n
\u4e00\u898b\u3059\u308b\u3068 AddScoped \u3067\u3082 AddSingleton \u3067\u3082\u826f\u3044\u3088\u3046\u306a\u6c17\u304c\u3059\u308b\u306e\u3067\u3059\u304c\u3001AddSingleton \u306e\u5834\u5408\u306f\u91cd\u5927\u306a\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u3068\u306a\u308b\u306e\u304c\u300c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5168\u4f53\u300d\u3068\u306a\u308b\u305f\u3081\u306b\u3001\u5225\u3005\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u958b\u3044\u3066\u3044\u3066\u3082\u3001\u540c\u3058\u30c7\u30fc\u30bf\u3092\u5171\u6709\u3059\u308b\u3093\u3067\u3059\u3088\u306d\u3002\u3061\u3087\u3063\u3068\u4e0d\u601d\u8b70\u306a\u52d5\u304d\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u5de6\u306e Chrome \u3067\u5165\u529b\u3057\u305f\u30ab\u30fc\u30c8\u753b\u9762\u3092\u3001\u305d\u306e\u307e\u307e Edge \u3067\u958b\u304f\u3068\u540c\u3058\u30ab\u30fc\u30c8\u306e\u5185\u5bb9\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u7570\u306a\u308b\u306e\u3067\u30bb\u30c3\u30b7\u30e7\u30f3\u5171\u6709\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\u304a\u305d\u3089\u304f AddSingleton \u306e\u5834\u5408\u306f\u300c\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3067\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306b\u306a\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u3042\u3001Blazor \u30b5\u30fc\u30d0\u30fc\u306e\u307b\u3046\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u306b\u3072\u3068\u3064\u3060\u3051\u5b58\u5728\u3059\u308b\u306e\u3067\u3001\u305d\u3053\u306b\u30e1\u30e2\u30ea\u304c\u3042\u308b\u3001\u3068\u3044\u3046\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/p>\n\n\n\n
\u3053\u308c\u306f\u3001\u30ab\u30fc\u30c8\u6a5f\u80fd\u3068\u3057\u3066\u306f\u4e0d\u5473\u3044\u3067\u3059\u306d\u3002<\/p>\n\n\n\n
AddScoped \u3092\u4f7f\u3046\u3068\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u5225\u306b\u306a\u308b\u306e\u3067\u30d6\u30e9\u30a6\u30b6\u304c\u7570\u306a\u308b\u3068\u30ab\u30fc\u30c8\u3082\u7570\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u304c\u81ea\u7136\u306a\u72b6\u614b\u3067\u3059\u3002<\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
AddScoped \u306e\u6642\u306e\u554f\u984c<\/strong><\/h2>\n\n\n\n
\u305d\u3046\u306a\u308b\u3068\u30ab\u30fc\u30c8\u6a5f\u80fd\u3092\u4f5c\u308b\u306a\u3089\u3070 AddScoped \u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u308c\u3082\u3061\u3087\u3063\u3068\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002Blazor \u304c\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u306a\u308b\u306e\u3067\u3001\u30d6\u30e9\u30a6\u30b6\u3067\u30ea\u30ed\u30fc\u30c9\u3092\u3059\u308b\u3068\u30ab\u30fc\u30c8\u306e\u4e2d\u8eab\u304c\u6d88\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u30ea\u30ed\u30fc\u30c9\u524d<\/strong><\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\u30ea\u30ed\u30fc\u30c9\u5f8c<\/strong><\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
\u3053\u308c\u306f wasm \u7248\u306e Blazor \u3082\u4e00\u7dd2\u3060\u3057\u3001React\/Vue \u306e\u5834\u5408\u3082\u30ea\u30ed\u30fc\u30c9\u3092\u3057\u305f\u5834\u5408\u306f\u540c\u3058\u6319\u52d5\u306b\u306a\u308b\u306e\u3067\u3001\u4ed5\u65b9\u304c\u306a\u3044\u3068\u3044\u3048\u3070\u4ed5\u65b9\u304c\u306a\u3044\u306e\u3067\u3059\u304c…\u307e\u3042\u3001\u30ab\u30fc\u30c8\u6a5f\u80fd\u3068\u3057\u3066\u306f\u30c0\u30e1\u3067\u3059\u306d\u3002<\/p>\n\n\n\n
\u305d\u3046\u306a\u308b\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u306e localStorage \u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3001\u3053\u308c\u3092\u6b21\u56de\u8a66\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6ce8\u6587\u30b5\u30a4\u30c8\u306e\u3088\u3046\u306a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9\u306e Web \u30a2\u30d7\u30ea\u306e\u3068\u304d\u306b\u3001\u753b\u9762\u9077\u79fb\u3092\u3057\u3066\u3082\u30ab\u30fc\u30c8\u6a5f\u80fd\u306e\u30e1\u30e2\u30ea\u306e\u3088\u3046\u306b\u72b6\u614b\u3092\u4fdd\u6301\u3057\u3066\u304a\u304d\u305f\u3044\u3068\u304d\u304c\u60a9\u307f\u3069\u3053\u308d\u3067\u3059\u3002 \u66f8\u7c4d\u306e\u307b\u3046 https:\/\/amzn.asia\/d\/0cim4yUX … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-12240","post","type-post","status-publish","format-standard","hentry","category-dev"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/12240","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/comments?post=12240"}],"version-history":[{"count":1,"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/12240\/revisions"}],"predecessor-version":[{"id":12247,"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/12240\/revisions\/12247"}],"wp:attachment":[{"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/media?parent=12240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/categories?post=12240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/tags?post=12240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}