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ジャンルのカテゴリ―名

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<p data-bm="48" 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; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; 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">以下に&nbsp;ASP.NET Core MVC での典型的な手順を示します。 辞書から値を安全に取得し、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Payment</code> オブジェクトを生成して <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">List&lt;Payment&gt;</code> に追加する方法です。<h3 data-bm="49" 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; display: inline-block; font: 400 20px / 22px roboto, helvetica, sans-serif; color: rgba(0, 0, 0, 0.8); 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;">完全な例</h3><pre data-priority="2" data-bm="50" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(249, 249, 249); border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 8px; overflow: hidden; color: rgba(0, 0, 0, 0.8); font-size: 16px; 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; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><div data-bm="55" 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(243, 249, 254);"><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(11, 73, 127);">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(225, 240, 253); border: 1px solid rgba(0, 0, 0, 0); display: grid; color: rgb(0, 0, 0) !important; grid-auto-flow: column; align-items: center; cursor: pointer; 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 System;
using System.Collections.Generic;

public class Payment
{
 public int PaymentId { get; set; } // 自動生成される
 public DateTime Posted { get; set; }
 public bool InOut { get; set; }
 public int? SubjectNameId { get; set; }
 public string ItemName { get; set; }
 public string PaymentName { get; set; }
 public int? PaymentTypeId { get; set; }
 public int? PaymentMethodId { get; set; }
 public int? IncomeCategoryId { get; set; }
 public int? IncomeTypeId { get; set; }
 public decimal Amount { get; set; }
}

public class Program
{
 public static void Main()
 {
 int thisYear = DateTime.Now.Year;
 int previousMonth = DateTime.Now.Month - 1;
 if (previousMonth == 0) { previousMonth = 12; thisYear--; }

 // 各Idを保持する辞書（例）
 var subjectNameDict = new Dictionary&lt;string, int&gt;
 {
 { &quot;家計&quot;, 1 },
 { &quot;事業&quot;, 2 }
 };

 var paymentTypeDict = new Dictionary&lt;string, int&gt;
 {
 { &quot;予算&quot;, 10 },
 { &quot;支出&quot;, 20 }
 };

 var paymentMethodDict = new Dictionary&lt;string, int&gt;
 {
 { &quot;現金&quot;, 100 },
 { &quot;銀行振込&quot;, 200 }
 };

 var incomeCategoryDict = new Dictionary&lt;string, int&gt;
 {
 { &quot;給与&quot;, 300 },
 { &quot;副業&quot;, 400 }
 };

 var incomeTypeDict = new Dictionary&lt;string, int&gt;
 {
 { &quot;定期&quot;, 500 },
 { &quot;臨時&quot;, 600 }
 };

 // TryGetValueで安全に取得
 int subjectId;
 int paymentTypeId;
 int paymentMethodId;
 int incomeCategoryId;
 int incomeTypeId;

 subjectNameDict.TryGetValue(&quot;家計&quot;, out subjectId); // 見つからなければ0
 paymentTypeDict.TryGetValue(&quot;予算&quot;, out paymentTypeId);
 paymentMethodDict.TryGetValue(&quot;現金&quot;, out paymentMethodId);
 incomeCategoryDict.TryGetValue(&quot;給与&quot;, out incomeCategoryId);
 incomeTypeDict.TryGetValue(&quot;定期&quot;, out incomeTypeId);

 // Paymentリスト
 var payments = new List&lt;Payment&gt;();

 // new Paymentで追加
 payments.Add(new Payment
 {
 Posted = new DateTime(thisYear, previousMonth, 1),
 InOut = true,
 SubjectNameId = subjectId != 0 ? subjectId : (int?)null,
 ItemName = &quot;今月予算&quot;,
 PaymentName = null,
 PaymentTypeId = paymentTypeId != 0 ? paymentTypeId : (int?)null,
 PaymentMethodId = paymentMethodId != 0 ? paymentMethodId : (int?)null,
 IncomeCategoryId = incomeCategoryId != 0 ? incomeCategoryId : (int?)null,
 IncomeTypeId = incomeTypeId != 0 ? incomeTypeId : (int?)null,
 Amount = 268000
 });

 // 確認
 foreach (var p in payments)
 {
 Console.WriteLine($&quot;Posted: {p.Posted}, SubjectNameId: {p.SubjectNameId}, Amount: {p.Amount}&quot;);
 }
 }
}
</code></pre><h3 data-bm="51" 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; display: inline-block; font: 400 20px / 22px roboto, helvetica, sans-serif; color: rgba(0, 0, 0, 0.8); 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;">ポイント</h3><ol data-bm="52" 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; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; 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;"><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;"><p 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;">辞書の型 <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Dictionary&lt;string, int&gt;</code> のようにキーを名前、値をIDにする。</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;"><p 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;">TryGetValueの安全性 <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">TryGetValue</code> はキーが存在しない場合でも例外を出さず、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">out</code> 変数にデフォルト値（<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">int</code>なら0）を入れる。</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;"><p 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;">null許容型への変換 <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Payment</code> クラスの各 <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Id</code> プロパティが&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">int?</code>（nullable int）の場合、 辞書から取得した値が0なら <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">null</code> に変換してセットする。</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;"><p 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;">Addの手順 <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">payments.Add(new Payment { ... })</code> の中で辞書から取得した値を直接使うか、事前に変数に格納してから使う。</li></ol><p data-bm="53" 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; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; 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;">💡 この方法なら、辞書から安全に値を取得し、存在しない場合は&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">null</code> をセットできます。 もし複数の <code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Payment</code> を作る場合は、辞書キーを変えて同じ手順を繰り返せばOKです。<p data-bm="54" 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; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; 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;">もし希望があれば、この処理を&nbsp;ループ化して複数のPaymentを自動生成する形 に書き換えた例も作れますが、 それも提示しますか？ そうすればコードがもっと簡潔になります。Powered by <a href="https://www.froala.com/wysiwyg-editor?pb=1" title="Froala Editor">Froala Editor</a>

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