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<p data-bm="39" 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">はい、ASP.NET MVC / ASP.NET Core MVC では、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelState.IsValid</code> が&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">false</code> の場合、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelState</code> の中にどのプロパティがエラーを持っているかを簡単に調べることができます。<br><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelState</code> は&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelStateDictionary</code> 型で、各キー（プロパティ名）に対して&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelStateEntry</code> があり、その中の&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Errors</code> コレクションにエラー情報が入っています&nbsp;<span data-bm="49" style="display: inline;"><span tabindex="0" data-bm="50" style="display: inline-flex; align-items: center; gap: 2px; height: 18px; padding: 0px 6px; margin: 0px 2px; font-size: 11px; font-weight: 600; line-height: 18px; color: rgb(50, 45, 41); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241); border-radius: 10px; cursor: pointer; vertical-align: middle; text-decoration: none;">1</span></span> <span data-bm="51" style="display: inline;"><span tabindex="0" data-bm="52" style="display: inline-flex; align-items: center; gap: 2px; height: 18px; padding: 0px 6px; margin: 0px 2px; font-size: 11px; font-weight: 600; line-height: 18px; color: rgb(50, 45, 41); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241); border-radius: 10px; cursor: pointer; vertical-align: middle; text-decoration: none;">2</span></span>。</p><h2 data-bm="40" 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; font: 22px / 24px Roboto, Helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; 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;">例: エラーのあるプロパティとメッセージを取得する</h2><pre data-priority="2" data-bm="41" 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; 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="57" 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(245, 245, 245);"><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;"><span style="color: rgb(215, 58, 73);">if</span> (!ModelState.IsValid)
{
    <span style="color: rgb(215, 58, 73);">var</span> errorList = ModelState
        .Where(ms =&gt; ms.Value.Errors.Count &gt; <span style="color: rgb(0, 92, 197);">0</span>) <span style="color: rgb(106, 115, 125);">// エラーがある項目だけ</span>
        .Select(ms =&gt; <span style="color: rgb(215, 58, 73);">new</span>
        {
            Field = ms.Key, <span style="color: rgb(106, 115, 125);">// プロパティ名</span>
            Errors = ms.Value.Errors
                             .Select(e =&gt; <span style="color: rgb(227, 98, 9);">string</span>.IsNullOrEmpty(e.ErrorMessage)
                                 ? e.Exception?.Message <span style="color: rgb(106, 115, 125);">// ErrorMessageが空ならExceptionのMessage</span>
                                 : e.ErrorMessage)
                             .ToList()
        })
        .ToList();

    <span style="color: rgb(106, 115, 125);">// ログ出力例</span>
    <span style="color: rgb(215, 58, 73);">foreach</span> (<span style="color: rgb(215, 58, 73);">var</span> err <span style="color: rgb(215, 58, 73);">in</span> errorList)
    {
        Console.WriteLine(<span style="color: rgb(3, 47, 98);">$&quot;[Field] <span style="color: rgb(36, 41, 46);">{err.Field}</span>&quot;</span>);
        <span style="color: rgb(215, 58, 73);">foreach</span> (<span style="color: rgb(215, 58, 73);">var</span> msg <span style="color: rgb(215, 58, 73);">in</span> err.Errors)
        {
            Console.WriteLine(<span style="color: rgb(3, 47, 98);">$&quot;  - <span style="color: rgb(36, 41, 46);">{msg}</span>&quot;</span>);
        }
    }
}
</code></pre><h2 data-bm="42" 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; font: 22px / 24px Roboto, Helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; 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</h2><ul data-bm="43" 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;"><strong style="font-weight: 700;"><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ms.Key</code></strong> がモデルのプロパティ名（例:&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">&quot;Title&quot;</code>,&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">&quot;ReleaseDate&quot;</code>）。</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;"><strong style="font-weight: 700;"><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ms.Value.Errors</code></strong> に&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelError</code> オブジェクトが入り、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ErrorMessage</code> または&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Exception</code> で詳細を取得できます。</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;">バインド変換エラー（例:&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">&quot;abc&quot;</code> を&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">int</code> に変換しようとした場合）は&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ErrorMessage</code> が空で、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">Exception</code> に詳細が入ることがあります&nbsp;<span data-bm="53" style="display: inline;"><span tabindex="0" data-bm="54" style="display: inline-flex; align-items: center; gap: 2px; height: 18px; padding: 0px 6px; margin: 0px 2px; font-size: 11px; font-weight: 600; line-height: 18px; color: rgb(50, 45, 41); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241); border-radius: 10px; cursor: pointer; vertical-align: middle; text-decoration: none;">2</span></span>。</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;">Razor ビューであれば、<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">@Html.ValidationSummary()</code> や&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">@Html.ValidationMessageFor()</code> を使えば自動的に表示されます。</li></ul><h2 data-bm="44" 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; font: 22px / 24px Roboto, Helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; 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;">簡易デバッグ用ワンライナー</h2><p data-bm="45" 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;">デバッグ中に即座に確認したい場合は、<strong style="font-weight: 700;">Watch ウィンドウ</strong>や<strong style="font-weight: 700;">即時実行ウィンドウ</strong>で以下を実行できます&nbsp;<span data-bm="55" style="display: inline;"><span tabindex="0" data-bm="56" style="display: inline-flex; align-items: center; gap: 2px; height: 18px; padding: 0px 6px; margin: 0px 2px; font-size: 11px; font-weight: 600; line-height: 18px; color: rgb(50, 45, 41); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241); border-radius: 10px; cursor: pointer; vertical-align: middle; text-decoration: none;">1</span></span>。</p><pre data-priority="2" data-bm="46" 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; 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="58" 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(245, 245, 245);"><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;">ModelState.Where(x =&gt; x.Value.Errors.Count &gt; <span style="color: rgb(0, 92, 197);">0</span>)
          .Select(x =&gt; <span style="color: rgb(215, 58, 73);">new</span> { x.Key, x.Value.Errors })
</code></pre><p data-bm="47" 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;">もしご希望であれば、このエラー取得処理を<strong style="font-weight: 700;">共通メソッド化</strong>して、どのコントローラーからでも呼び出せるようにするサンプルも作れますが、作りますか？<br>そうすれば&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">ModelState</code> の中身を毎回 LINQ で書かなくても済みます。</p><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;"><a href="https://stackoverflow.com/questions/1791570/modelstate-isvalid-false-why" target="_blank" rel="noopener noreferrer" style="color: rgb(60, 81, 180); text-decoration: none; touch-action: manipulation; display: inline-flex; align-items: center; gap: 4px; padding: 2px 10px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 14px; font-size: 13px; font-weight: 600; line-height: 20px;">1-Stackoverflow.com</a> <a href="https://stackoverflow.com/questions/5212248/get-error-message-if-modelstate-isvalid-fails" target="_blank" rel="noopener noreferrer" style="color: rgb(60, 81, 180); text-decoration: none; touch-action: manipulation; display: inline-flex; align-items: center; gap: 4px; padding: 2px 10px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); border-color: rgba(0, 0, 0, 0.1); border-style: solid; border-width: 1px; border-image: none 100% / 1 / 0 stretch; border-radius: 14px; font-size: 13px; font-weight: 600; line-height: 20px;">2-Stackoverflow.com</a></p><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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