编辑userPropfile asp.net mvc4

Question

我有这个：

控制器动作：

 public ActionResult Edit(int id = 0)
 {
      UserProfile user = db.SelectByID(id);
      return View(user);
      //if (id == null)
      //{
      //    return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
      //}
      //UserProfile userProfile = db.SelectByID(id);
      //if (userProfile == null)
      //{
      //    return HttpNotFound();
      //}
      //return View(userProfile);
      }

模型视图：

 [Table("UserProfile")]
 public class UserProfile
 {
     [Key]
     [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
     public int UserId { get; set; }
     public string UserName { get; set; }
     public string FirstName { get; set; }
     public string LastName { get; set; }
     public string Email { get; set; }
  }

和视图：

@model ContosoUniversity.Models.UserProfile
@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

@using (Html.BeginForm("Edit","Account"))
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Lola Biker</h4>
        <hr />
        @Html.ValidationSummary(true)
        @Html.HiddenFor(model => model.UserId)

        <div class="form-group">
            @Html.LabelFor(model => model.LastName, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.LastName)
                @Html.ValidationMessageFor(model => model.LastName)
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.FirstName, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.FirstName)
                @Html.ValidationMessageFor(model => model.FirstName)
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

这是一个asp.net mvc4应用程序，我要编辑注册用户的名字和姓氏。 我向“注册”用户添加了一些额外的属性。 但是，如果我运行该应用程序，则会出现此错误：

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 221:            {
Line 222:
Line 223:                UserProfile user = db.SelectByID(id);
Line 224:                return View(user);
Line 225:                //if (id == null)

Source File: g:\Mijn Documents\My Web Sites\Lolabikes\C#\ContosoUniversity\Controllers\AccountController.cs    Line: 223 

我已经登录，将被重定向到编辑页面，如下所示：

@if (Request.IsAuthenticated)
{
    <text>
        Hello, @Html.ActionLink(User.Identity.Name, "Edit", "Account", routeValues: null, htmlAttributes: new { @class = "username", title = "Manage" })!
        @using (Html.BeginForm("LogOff", "Account", FormMethod.Post, new { id = "logoutForm" }))
        {
            @Html.AntiForgeryToken()
            <a href="javascript:document.getElementById('logoutForm').submit()">Log off</a>
        }
    </text>
}
else
{
    <ul>
        <li>@Html.ActionLink("Register", "Register", "Account", routeValues: null, htmlAttributes: new { id = "registerLink" })</li>
        <li>@Html.ActionLink("Log in", "Login", "Account", routeValues: null, htmlAttributes: new { id = "loginLink" })</li>
    </ul>
}

谢谢您的帮助

我也尝试过这样：

public ActionResult Edit(int? id)
{
    UserProfile user = db.SelectByID(id);
    return View(user);
}

但是我仍然得到id = null

我现在有这样的编辑：

public ActionResult Edit(int? id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    UserProfile user = db.SelectByID(id);
    if (user == null)
    {
        return HttpNotFound();
    }
    return View(user);               
}

并查看：

@Html.ActionLink(User.Identity.Name, "Edit", "Account", new { userId = 123 }, new { title = "Manage" })

我对此设置了断点：if（id == null）

它说：null = null

我现在有这样的编辑：

public ActionResult Edit（int？userId）{

            //if (userId = null )
            //{
            //    return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            //}
             UserProfile user = db.SelectByID(userId);
     //       if (user == null)
     //       {
     //           return HttpNotFound();
     //       }
            return View(user);               
        }

但用户为空

因此，如果我这样做，您的建议是：

public ActionResult Edit(int userId )
 {
    //your code here you get the userId to manipulate.
 }

当然我看到然后是空的texboxes（firstName，lastName）

好的，我现在是这样的：

@ Html.ActionLink（User.Identity.Name，“编辑”，“帐户”，新的{Id = Context.User.Identity.Name}，新的{title =“ Manage”}）

和模型UserProfile，如下所示：

[Table("UserProfile")]
    public class UserProfile
    {

        public int Id { get; set; }
        public string UserName { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Email { get; set; }
        //ok
        public int MyProperty { get; set; }
    }

但是我的Id当然也是一个整数，也在datbase中。 但是这个：

id = Context.User.Identity.Name-Identity.Name-我只看到Name-这是一个字符串，如何更改？

因为：UserProfile用户= db.SelectByID（Id）; 仍然用户为空吗？

谢谢

Answer 1

尝试这个

@Html.ActionLink(User.Identity.Name, "Edit", "Account", new { userId = *Your ID here* }, new {title = "Manage"})

和你的控制器方法像

 public ActionResult Edit(int userId )
 {
    //your code here you get the userId to manipulate.
 }

您所做的错误是您为路由值提供了空值。 这就是为什么您在控制器操作中得到null的原因。

Answer 2

好的，我找到了一种解决方法，但这并不理想，因为我使用的是通用存储库，但是对于编辑配置文件，我不使用存储库，这是我固定的方法：

private LolaBikeContext db = new LolaBikeContext();



public ActionResult Edit(string UserId)
            {             

                string username = User.Identity.Name;

                // Fetch the userprofile
                UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));

                // Construct the viewmodel
                UserProfile model = new UserProfile();
                model.FirstName = user.FirstName;
                model.LastName = user.LastName;
                model.Email = user.Email;
                model.Motto = user.Motto;
                model.PlaceOfBirth = user.PlaceOfBirth;
                model.HowManyBikes = user.HowManyBikes;
                model.BesideYourBeth = user.BesideYourBeth;
                model.NicestRide = user.NicestRide;
                model.WorstRide = user.WorstRide;
                model.AmountKmPerYear = user.AmountKmPerYear;
                model.AverageSpeed = user.AverageSpeed;
                model.AbleToChatWhileRiding = user.AbleToChatWhileRiding;
                model.PhoneNumber = user.PhoneNumber;




                return View(user);               
            }


            [HttpPost]
            public ActionResult Edit(UserProfile userprofile)
            {
                if (ModelState.IsValid)
                {
                    string username = User.Identity.Name;
                    // Get the userprofile
                    UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));

                    // Update fields
                    user.FirstName = userprofile.FirstName;
                    user.LastName = userprofile.LastName;
                    user.Email = userprofile.Email;
                    user.Motto = userprofile.Motto;

                    user.PlaceOfBirth = userprofile.PlaceOfBirth;
                    user.HowManyBikes = userprofile.HowManyBikes;
                    user.BesideYourBeth = userprofile.BesideYourBeth;
                    user.NicestRide = userprofile.NicestRide;
                    user.WorstRide = userprofile.WorstRide;
                    user.AmountKmPerYear = userprofile.AmountKmPerYear;
                    user.AverageSpeed = userprofile.AverageSpeed;
                    user.AbleToChatWhileRiding = userprofile.AbleToChatWhileRiding;
                    user.PhoneNumber = userprofile.PhoneNumber;

                    db.Entry(user).State = EntityState.Modified;

                    db.SaveChanges();

                    return RedirectToAction("Edit", "Account"); // or whatever
                }

                return View(userprofile);
            }

因此，这不是理想的课程，但目前可以正常工作

Answer 3

尝试这个

@Html.ActionLink(User.Identity.Name, "Edit", "Account", new { userId = *Your ID here* }, new {title = "Manage"})

和你的控制器方法像

[HttpPost]
 public ActionResult Edit(int userId = 0)
 {
    //your code here you get the userId to manipulate.
 }