asp.net web 应用后台隐藏数据字段

Question

我正在制作一个 web 应用程序，我使用了来自数据库 model 的基于实体的 EF 设计器我想隐藏后端的修改日期和修改日期，它不应该显示给用户有人可以帮助我如何完成这项工作吗？ 我在下面附上了我的图片和代码，如果有任何问题，请告诉我。

图片： Controller 代码：

// 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隐藏这两个修改日期和修改者。

查看代码

<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>

Answer 1

通常，存储在数据库中的实体类型具有您不想、不能或不应在 UI 上公开的字段。

如果您不关心存在的数据并且只想“隐藏”它，那么只需不要将它们包含在表标记中即可。

但是，如果您根本不希望出现这些字段，一种常见的解决方法是创建一个仅包含您希望公开的字段的 DTO class。 更新您的 UI 以定位 DTO 并从表中删除列。

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删除的字段，请使用主键加载实体类型并更新它。 这假设您有一些方法来填充当前用户。

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;