[英]How to communicate with backend in an empty ASP.NET web application template?
[英]asp.net web application hide data field at the backend
我正在制作一個 web 應用程序,我使用了來自數據庫 model 的基於實體的 EF 設計器我想隱藏后端的修改日期和修改日期,它不應該顯示給用戶有人可以幫助我如何完成這項工作嗎? 我在下面附上了我的圖片和代碼,如果有任何問題,請告訴我。
圖片: Controller 代碼:
// GET: Contract
public ActionResult Index()
{
return View(db.Contracts.ToList());
}
// GET: Contract/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Contract contract = db.Contracts.Find(id);
if (contract == null)
{
return HttpNotFound();
}
return View(contract);
}
// GET: Contract/Create
public ActionResult Create()
{
return View();
}
// POST: Contract/Create
// To protect from overposting attacks, enable the specific properties you want to bind to, for
// more details see https://go.microsoft.com/fwlink/?LinkId=317598.
\[HttpPost\]
\[ValidateAntiForgeryToken\]
public ActionResult Create(\[Bind(Include = "Id,ContractName,ContractNumber,CreatedBy,CreatedDate,ModifiedBy,ModifiedDate")\] Contract contract)
{
if (ModelState.IsValid)
{
db.Contracts.Add(contract);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(contract);
}
// GET: Contract/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Contract contract = db.Contracts.Find(id);
if (contract == null)
{
return HttpNotFound();
}
return View(contract);
}
// POST: Contract/Edit/5
// To protect from overposting attacks, enable the specific properties you want to bind to, for
// more details see https://go.microsoft.com/fwlink/?LinkId=317598.
\[HttpPost\]
\[ValidateAntiForgeryToken\]
public ActionResult Edit(\[Bind(Include = "Id,ContractName,ContractNumber,CreatedBy,CreatedDate,ModifiedBy,ModifiedDate")\] Contract contract)
{
if (ModelState.IsValid)
{
db.Entry(contract).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(contract);
}
// GET: Contract/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Contract contract = db.Contracts.Find(id);
if (contract == null)
{
return HttpNotFound();
}
return View(contract);
}
// POST: Contract/Delete/5
\[HttpPost, ActionName("Delete")\]
\[ValidateAntiForgeryToken\]
public ActionResult DeleteConfirmed(int id)
{
Contract contract = db.Contracts.Find(id);
db.Contracts.Remove(contract);
db.SaveChanges();
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose();
}
base.Dispose(disposing);
}
}
}`
我想弄清楚,但我不知道如何在后端隱藏這兩個修改日期和修改者。
查看代碼
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Contract</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.ContractName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ContractName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ContractName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ContractNumber, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ContractNumber, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ContractNumber, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.CreatedBy, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.CreatedBy, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.CreatedBy, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.CreatedDate, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.CreatedDate, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.CreatedDate, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ModifiedBy, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ModifiedBy, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ModifiedBy, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ModifiedDate, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ModifiedDate, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ModifiedDate, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<button style="background-color:white; border-color:darkgrey;"><input type="submit" value="Create" class="btn btn-default" /></button>
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
<script src="~/Scripts/jquery-3.4.1.min.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
通常,存儲在數據庫中的實體類型具有您不想、不能或不應在 UI 上公開的字段。
如果您不關心存在的數據並且只想“隱藏”它,那么只需不要將它們包含在表標記中即可。
但是,如果您根本不希望出現這些字段,一種常見的解決方法是創建一個僅包含您希望公開的字段的 DTO class。 更新您的 UI 以定位 DTO 並從表中刪除列。
public class ContractDto
{
// all the fields you want to expose
// Ctor
public ContractorDto(Contract contract) { ... }
// "From" pattern
public static ContractDto From(Contract contract)
=> new ContractDto { ... }
// An implicit operator can also be helpful
public static implicit operator ContractDto(Contract contract)
=> new ContractDto { ... }
}
例如,如果您需要更新在更新后刪除的字段,請使用主鍵加載實體類型並更新它。 這假設您有一些方法來填充當前用戶。
var entity = db.Contracts.Find(contractDto.Id);
// update entity from dto as needed
entity.ModifiedBy = // populate the user from context or similar
entity.ModifiedDate = DateTime.Now;
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