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こんにちは皆私はasp.net mvcを使用して、ユーザーができるだけ多くの画像でブログ投稿を作成できるコードの最初のデータベースを使用してアプリケーションを作成しようとしています彼らは望む。このアプリケーションは、ヘッド、ボディ、イメージフィールドがいっぱいであるか、ヘッドとボディの検証を取る限り、完璧に機能します。この検証エラーでプログラムがクラッシュするとヘッドとボディの検証が行われます。他の入力の妥当性は、nullを許可する入力を妨げます
DbEntityValidationException An exception of type 'System.Data.Entity.Validation.DbEntityValidationException' occurred in Crud.dll but was not handled in user code
Additional information: Validation failed for one or more entities. See 'EntityValidationErrors' property for more details. The validation errors are: Heading is Required; Body is Required
この問題のお手伝いをありがとうございます。
ビュー
@model Crud.Models.PostModel
@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm("Edit", "Home", null, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<fieldset>
<div class="editor-field">
@Html.LabelFor(model => model.Heading)
@Html.TextBoxFor(model => model.Heading)
@Html.ValidationMessageFor(model => model.Heading)
</div>
<div>
@Html.LabelFor(model => model.PostBody)
@Html.TextBoxFor(model => model.PostBody)
@Html.ValidationMessageFor(model => model.PostBody)
</div>
<div class="editor-label">
@*Temporary way to upload*@
@Html.LabelFor(model => model.ImagePath)
@Html.TextBoxFor(model => model.ImagePath, new { type = "file", multiple = "multiple", NAME = "files" })
</div>
<div class="editor-label">
@*Future Upload links*@
@*@Html.LabelFor(model => model.Images)
@Html.TextBoxFor(model => model.Images, new { type = "file", multiple = "multiple" })
@Html.ValidationMessageFor(model => model.Images)*@
</div>
<p><input type="submit" value="Create" /></p>
</fieldset>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
リポジトリ
public void Save(PostModel Post)
{
try
{
if (Post.PostID == 0)
{
context.Posts.Add(Post);
}
else
{
PostModel dbEntry = context.Posts.Find(Post.PostID);
if (dbEntry != null)
{
dbEntry.Heading = Post.Heading;
dbEntry.PostBody = Post.PostBody;
}
}
context.SaveChanges();
}
catch (DbEntityValidationException ex)
{
// Retrieve the error messages as a list of strings.
var errorMessages = ex.EntityValidationErrors
.SelectMany(x => x.ValidationErrors)
.Select(x => x.ErrorMessage);
// Join the list to a single string.
var fullErrorMessage = string.Join("; ", errorMessages);
// Combine the original exception message with the new one.
var exceptionMessage = string.Concat(ex.Message, " The validation errors are: ", fullErrorMessage);
// Throw a new DbEntityValidationException with the improved exception message.
throw new DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors);
}
}
モデル
public partial class PostModel
{
[Key]
[HiddenInput(DisplayValue = false)]
public int PostID { get; set; }
[Required(ErrorMessage = "Heading is Required")]
[Display(Name = "Heading")]
public string Heading { get; set; }
[Required(ErrorMessage = "Body is Required")]
[DataType(DataType.MultilineText)]
[Display(Name = "Body")]
public string PostBody { get; set; }
public string ImageDisplayName { get; set; }
public string ImagePath { get; set; } //Temporarly here until I can get the ImageModel Method Working
//public virtual ICollection<ImageModel> Images { get; set; }
}
コントローラ
public ViewResult Create()
{
return View("Edit", new PostModel());
}
public ViewResult Edit(int PostID)
{
PostModel editedItem = repository.Posts
.FirstOrDefault(p => p.PostID == PostID);
return View(editedItem);
}
[HttpPost]
public ActionResult Edit(PostModel Post, IEnumerable<HttpPostedFileBase> files)
{
if (ModelState.IsValid)
{
foreach (var file in files)
{
PostModel post = new PostModel();
if (file != null && file.ContentLength > 0)
{
string displayName = file.FileName;
string fileExtension = Path.GetExtension(displayName);
string fileName = string.Format("{0}.{1}", Guid.NewGuid(), fileExtension);
string path = Path.Combine(Server.MapPath("~/Img/"), fileName);
file.SaveAs(path);
post.ImageDisplayName = displayName;
post.ImagePath = fileName;
post.PostBody = Post.PostBody;
post.Heading = Post.Heading;
}
repository.Save(post);
}
}
return RedirectToAction("display");
}