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ジャンルのカテゴリ―名

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<div style="flex: 1 1 0%; display: flex; overflow: hidden; flex-direction: column; height: 368px; box-sizing: border-box; padding: 20px 20px 0px; color: rgb(39, 35, 32); font-family: Roboto, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;" data-pasted="true"><div style="display: flex; flex: 1 1 0%; position: relative; min-width: 0px; height: 256px; flex-direction: column;"><div tabindex="-1" style="color: rgb(76, 70, 66); padding: 0px; flex: 1 1 0%; font-size: 16px; line-height: 26px; font-weight: 400; overflow: auto; max-height: 420px;"><p data-bm="113" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;">了解です。では、さらに構成を変えて、<br><strong style="font-weight: 700;">「アプリ起動時に非同期で初期データを投入する」</strong> サンプルにリファクタリングします。<br>これにより、大量データや外部API連携を伴う初期化にも対応しやすくなります。</p><p data-bm="114" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">① DbContext クラス</strong></p><pre data-priority="2" data-bm="115" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 8px; overflow: hidden;"><div data-bm="128" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: Roboto, Helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Csharp</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgb(217, 223, 251); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;">using Microsoft.EntityFrameworkCore;

public class AppDbContext : DbContext
{
    public DbSet&lt;User&gt; Users { get; set; }

    public AppDbContext(DbContextOptions&lt;AppDbContext&gt; options)
        : base(options) { }
}
</code></pre><p data-bm="116" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">② モデルクラス</strong></p><pre data-priority="2" data-bm="117" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 8px; overflow: hidden;"><div data-bm="129" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: Roboto, Helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Csharp</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgb(217, 223, 251); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;">public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
}
</code></pre><p data-bm="118" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">③ 非同期初期化クラス</strong></p><pre data-priority="2" data-bm="119" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 8px; overflow: hidden;"><div data-bm="130" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: Roboto, Helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Csharp</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgb(217, 223, 251); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;">public static class DatabaseInitializer
{
    public static async Task SeedAsync(AppDbContext db)
    {
        // 既にデータがある場合はスキップ
        if (await db.Users.AnyAsync()) return;

        var initialUsers = new List&lt;User&gt;
        {
            new User { Name = &quot;Admin&quot;, Email = &quot;admin@example.com&quot; },
            new User { Name = &quot;Guest&quot;, Email = &quot;guest@example.com&quot; }
        };

        await db.Users.AddRangeAsync(initialUsers);
        await db.SaveChangesAsync();
    }
}
</code></pre><p data-bm="120" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">④ Program.cs（ASP.NET Core MVC の場合）</strong></p><pre data-priority="2" data-bm="121" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 8px; overflow: hidden;"><div data-bm="131" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: Roboto, Helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Csharp</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgb(217, 223, 251); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;">var builder = WebApplication.CreateBuilder(args);

// DbContext 登録
builder.Services.AddDbContext&lt;AppDbContext&gt;(options =&gt;
    options.UseSqlServer(builder.Configuration.GetConnectionString(&quot;DefaultConnection&quot;)));

var app = builder.Build();

// 起動時に DB 作成＆非同期初期化
using (var scope = app.Services.CreateScope())
{
    var db = scope.ServiceProvider.GetRequiredService&lt;AppDbContext&gt;();
    await db.Database.MigrateAsync();
    await DatabaseInitializer.SeedAsync(db);
}

app.MapDefaultControllerRoute();
await app.RunAsync();
</code></pre><p data-bm="122" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">⑤ 接続文字列例（appsettings.json）</strong></p><pre data-priority="2" data-bm="123" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 8px; overflow: hidden;"><div data-bm="132" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: Roboto, Helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Json</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgb(217, 223, 251); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;">{
  &quot;ConnectionStrings&quot;: {
    &quot;DefaultConnection&quot;: &quot;Server=localhost;Database=MyAppDb;Trusted_Connection=True;TrustServerCertificate=True;&quot;
  }
}
</code></pre><p data-bm="124" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">この非同期版のメリット</strong></p><ul data-bm="125" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert;"><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">大量データ投入時でも UI スレッドをブロックしない。</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">外部APIやファイル読み込みを伴う初期化処理を組み込みやすい。</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">将来的にクラウドDBやリモート接続でも安定動作。</li></ul><p data-bm="126" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;">この非同期パターンは、特に&nbsp;<strong style="font-weight: 700;">クラウド環境やコンテナ起動時の初期化</strong> に向いています。<br>もし希望があれば、このコードを&nbsp;<strong style="font-weight: 700;">.NET Framework MVC 用に同期処理へ変換したバージョン</strong> も作成できます。</p><p data-bm="127" style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;">もしよければ、この非同期版に&nbsp;<strong style="font-weight: 700;">トランザクション管理</strong> を組み込んだ安全性の高いバージョンもお見せできますが、そちらにしますか？</p></div></div></div><div style="color: rgba(0, 0, 0, 0.6); border-top: 0px; margin: 0px 20px; padding: 0px 0px 20px; height: 36px; display: flex; align-items: center; position: relative; font-family: Roboto, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><div style="flex: 1 1 0%; display: flex; gap: 8px; align-items: center;"><button type="button" title="Undo" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 700 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgba(0, 0, 0, 0); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; block-size: 38px; gap: 4px; padding-inline: unset; aspect-ratio: 1 / 1; justify-content: center; border-radius: 8px;"><div data-visually-hidden="" style="box-sizing: border-box; margin: unset; padding: unset; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); block-size: 1px; inline-size: 1px; border: 0px; clip: rect(0px, 0px, 0px, 0px); clip-path: inset(50%); position: absolute; padding-inline: 4px;">Undo</div></button><button type="button" tabindex="-1" title="Redo" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 700 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgba(0, 0, 0, 0); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: not-allowed; color: rgb(60, 81, 180) !important; text-decoration: none !important; opacity: 0.3; block-size: 38px; gap: 4px; padding-inline: unset; aspect-ratio: 1 / 1; justify-content: center; border-radius: 8px;"><div data-visually-hidden="" style="box-sizing: border-box; margin: unset; padding: unset; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); block-size: 1px; inline-size: 1px; border: 0px; clip: rect(0px, 0px, 0px, 0px); clip-path: inset(50%); position: absolute; padding-inline: 4px;">Redo</div></button><button type="button" title="Copy" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 700 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgba(0, 0, 0, 0); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; block-size: 38px; gap: 4px; padding-inline: unset; aspect-ratio: 1 / 1; justify-content: center; border-radius: 8px;"><div data-visually-hidden="" style="box-sizing: border-box; margin: unset; padding: unset; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); block-size: 1px; inline-size: 1px; border: 0px; clip: rect(0px, 0px, 0px, 0px); clip-path: inset(50%); position: absolute; padding-inline: 4px;">Copy</div></button><button type="button" title="Export" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 700 13px / 20px Roboto, Helvetica, sans-serif; background-color: rgba(0, 0, 0, 0); border-color: rgba(0, 0, 0, 0); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; block-size: 38px; gap: 4px; padding-inline: unset; aspect-ratio: 1 / 1; justify-content: center; border-radius: 8px;"><div data-visually-hidden="" style="box-sizing: border-box; margin: unset; padding: unset; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); block-size: 1px; inline-size: 1px; border: 0px; clip: rect(0px, 0px, 0px, 0px); clip-path: inset(50%); position: absolute; padding-inline: 4px;">Export</div></button><div style="display: flex; align-items: center; gap: 8px; padding: 4px 8px; border-radius: 8px; color: rgba(0, 0, 0, 0.6); width: 300px; min-height: 40px; max-height: 120px; position: absolute; box-sizing: border-box; bottom: 18px; border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(247, 247, 247); left: 172px;"><br></div></div></div><p data-f-id="pbf" style="text-align: center; font-size: 14px; margin-top: 30px; opacity: 0.65; font-family: sans-serif;">Powered by <a href="https://www.froala.com/wysiwyg-editor?pb=1" title="Froala Editor">Froala Editor</a></p>

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