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Chapter13:Adding Delete Functionality

In the last two chapters, we created the functionality for creating and editing recipes. In this chapter,we’re going to complite the set by implementng the recipe delete function.We’ll start by creating a file named Delete.cshtml in the Views/Recipe folder, once the file has been created, copy the code below int it.Unlike the Create and Edit views, We’re not setting up a lot of form fields for the Delete view. Instead, we show the user some details about the recipe and ask them to confirm whether tthey want to delete it or not.Here’s what the user will be presented with on deleting a recipe.

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Chapter13:Adding Delete Functionality

// GET: skyArticles/Create public IActionResult Create() { WriteGenreNameIntoViewData(); return View(); } // POST: skyArticles/Create // To protect from overposting attacks, enable the specific properties you want to bind to. // For more details, see http://go.microsoft.com/fwlink/?LinkId=317598. [HttpPost] [ValidateAntiForgeryToken] public async Task<IActionResult> Create([Bind("Id,Posted,Title,SubTitle,Content,ImageUrl,GenreName")] skyArticle skyArticle, IFormFile upFile) { if (upFile == null || upFile.Length == 0) { skyArticle.ImageUrl = string.Empty; // Viewのタグ[<input type="file" name="upFile" class="form-control" />]asp-for("")は必ず削除する。 } else { //var success = 0; // var ps = _db.Photos; //foreach (var file in upFile) var file = upFile; var name = file.FileName; var ext = new[] { ".jpg", ".jpeg", ".png", ".gif" }; if (!ext.Contains(Path.GetExtension(name))) { ModelState.AddModelError(string.Empty, $"拡張子は.png、.jpg, .gif でなければいけません（{name}）"); } if (file.Length > 1024 * 1024) { ModelState.AddModelError(string.Empty, $"サイズは1mb以内でなければいけません（{name}）"); } var path = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot/Images/Articles", name); using var stream = new FileStream(path, FileMode.Create); file.CopyTo(stream); skyArticle.ImageUrl = $"/Images/Articles/{name}"; } _context.Add(skyArticle); await _context.SaveChangesAsync(); WriteGenreNameIntoViewData(); return RedirectToAction(nameof(Index)); }
Tutorial Sample

Chapter13:Adding Delete Functionality

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2025年03月30日18時53分

５－１　Genreクラス)

<p id="isPasted">using System.ComponentModel;</p><p><strong><span style="font-size: 11px;">using System.ComponentModel.DataAnnotations;</span></strong></p><p><span style="font-size: 11px;">namespace S
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2025年03月13日18時21分

MVC の単一ビュー内の複数のモデル)

<pre style="text-align: left;"><span style="font-size: 24px;"><strong><u>ViewDataとViewBag,を使用する、Controller側のコード例：</u></strong></span></pre><p id="isPasted" class="fr-text-gray"><strong><span style="fo
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2025年03月08日06時34分

1対多クラスの記述例)

<p style='margin:0mm;text-align:justify;font-size:14px;font-family:"游明朝",serif;' id="isPasted">&nbsp; &nbsp;下記はGenre（１）とArticle（多）のクラス。記述例です。</p><p style='margin:0mm;text-align:justify;font-size:14px;
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