ASP.NET Core MVC和EF Core 1.1

Question

我对如何添加参数有疑问，请参见下面的代码：

[HttpPost]
    [ValidateAntiForgeryToken]
    public IActionResult Edit(Employee emp)
    {
        try
        {

            Employee updateEmp = _Context.Employee.FirstOrDefault(c => c.Idemployee == emp.Idemployee);
            updateEmp.Address = emp.Address;
            updateEmp.Age = emp.Age;
            updateEmp.ContactNumber = emp.ContactNumber;
            updateEmp.FullName = emp.FullName;
            updateEmp.Gender = emp.Gender;
            updateEmp.IsActive = emp.IsActive;

            _Context.Employee.Update(updateEmp);
            _Context.SaveChanges();

            return RedirectToAction("Index");
        }
        catch (Exception)
        {

            throw;
        }
    }

我在这里想要做的是我正在尝试从查询字符串中提取emp.Idemployee，但它无法将我重定向到错误null异常。

我正在使用一个模型从cshtml提取细节。

public IActionResult Edit(int id)
    {
        var editEmployee = _Context.Employee.FirstOrDefault(c => c.Idemployee == id);

        return View(editEmployee);
    }

我不知道这有什么问题，但除Idemployee之外，其他所有信息都已提取。

 @model Demo101.DAL.Entities.Models.Employee @{ ViewBag.Title = "Edit Employee"; } <h2>@ViewData["Title"]</h2> <form asp-controller="Employee" asp-action="Edit" method="post" class="form-horizontal" role="form"> <div class="form-horizontal"> <div asp-validation-summary="All" class="text-danger"></div> <!--FullName--> <label asp-for="Idemployee" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.LabelFor(model => model.Idemployee, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.Idemployee) </div> <!--FullName--> <label asp-for="FullName" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.TextBoxFor(model => model.FullName, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.FullName) </div> <!--Age--> <label asp-for="Age" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.TextBoxFor(model => model.Age, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.Age) </div> <!--ContactNumber--> <label asp-for="ContactNumber" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.TextBoxFor(model => model.ContactNumber, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.ContactNumber) </div> <!--Address--> <label asp-for="Address" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.TextBoxFor(model => model.Address, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.Address) </div> <!--Gender--> <label asp-for="Gender" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.TextBoxFor(model => model.Gender, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.Gender) </div> <!--IsActive--> <label asp-for="IsActive" class="col-md-2 control-label"></label> <div class="col-md-10"> @Html.CheckBoxFor(model => model.IsActive, new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.IsActive) </div> <!--Create Button--> <div class="col-md-offset-2 col-md-10"> <input type="submit" value="Edit Employee" class="btn btn-default" /> </div> </div> </form> 

谢谢！

Answer 1

看下面的代码，试试看

<!--IdEmployee-->
<label asp-for="Idemployee" class="col-md-2 control-label"></label>
<div class="col-md-10">
    @Html.LabelFor(model => model.Idemployee, new { @class = "form-control" })
    @Html.HiddenFor(model => model.Idemployee)
    @Html.ValidationMessageFor(model => model.Idemployee)
</div>

Answer 2

您的视图不包含任何具有Employee值的字段。 您有标签，您有验证消息，但本身没有价值。 因此，在POST到服务器中没有任何价值。

在表格内添加：

@Html.HiddenFor(model => model.Idemployee)