在ASP.NET MVC中插入后表未递增 [英] Table not incrementing after an insert in asp.net mvc
问题描述
我正在研究ASP.NET MVC项目.我创建了要在项目中使用的各种模型和视图模型.我还用种子数据为数据库表添加了种子，但是在实现注册视图后，我测试了表单，但由于插入到数据库表的ID部分中的值变为0.我删节了表，然后重新插入，仍然有同样的错误.
I'm working on an ASP.NET MVC project. I have created the various models and the viewmodels to use in my project. I have also seeded my database table with seed data but upon implementing the registration view, I tested the form but was getting 0 as the value inserted into the Id portion of the database table. I truncated the tables and did a fresh new insert I still had same error.
下面是用户表的模型
public class User
{
[Key]
public byte Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public string RefIndicator { get; set; }
public Team TeamCategory { get; set; }
public byte TeamId { get; set; }
public bool IsRegistered { get; set; }
public DateTime DateRegistered { get; set; }
public DateTime? LastModified { get; set; }
public UserRoles UserRoles { get; set; }
public byte UserRolesId { get; set; }
}
和下面是我为需要在视图中使用的Team Model属性创建的viewModel
and below is the viewModel I created for the Team Model property I needed to use in my view
public class RegisterFormViewModel
{
public User Users { get; set; }
public byte Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public IEnumerable<Team> Teams { get; set; }
public byte TeamId { get; set; }
public string RefIndicator { get; set; }
public bool IsRegistered { get; set; }
public DateTime DateRegistered { get; set; }
public byte UserRolesId { get; set; }
}
这是userController的register操作，用于初始化Register视图的值
And here is the register action to the userController to initialize the values for the Register view
public ActionResult Register()
{
var AppUser = User.Identity.Name.Substring(5);
var AppUserEmail = AppUser + "@nlng.com";
int index = AppUser.IndexOf('.');
var FirstName = AppUser.Substring(0, index);
var LastName = AppUser.Substring(index + 1);
var IsRegistered = true;
var UserRolesId = 1;
var DateRegistered = HttpContext.Timestamp;
var teams = _context.Team.ToList();
var viewModel = new RegisterFormViewModel{
Email = AppUserEmail,
FirstName = FirstName,
LastName = LastName,
Teams = _context.Team.ToList(),
IsRegistered = IsRegistered,
UserRolesId = (byte)UserRolesId,
DateRegistered = DateRegistered
};
return View("Register", viewModel);
}
最后是注册页面的关联视图
And finally here is the associated view for the registration page
@model eLeave.ViewModel.RegisterFormViewModel
@{
ViewBag.Title = "Register";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>User Registration</h2>
@using (Html.BeginForm("Save", "User"))
{
<div class="form-group">
@Html.LabelFor(r=>r.FirstName)
@Html.TextBoxFor(r => r.FirstName, new { @class = "form-control", @readonly = true })
</div>
<div class="form-group">
@Html.LabelFor(r => r.LastName)
@Html.TextBoxFor(r => r.LastName, new { @class = "form-control", @readonly = true })
</div>
<div class="form-group">
@Html.LabelFor(r => r.Email)
@Html.TextBoxFor(r => r.Email, new { @class = "form-control", @readonly = true })
</div>
<div class="form-group">
@Html.LabelFor(r => r.TeamId)
@Html.DropDownListFor(r => r.TeamId, new SelectList(Model.Teams, "Id", "TeamName"), "Select your Team", new { @class = "form-control" })
</div>
<div class="form-group">
@Html.LabelFor(r => r.RefIndicator)
@Html.TextBoxFor(r => r.RefIndicator, new { @class = "form-control" })
</div>
@Html.HiddenFor(m => m.IsRegistered)
@Html.HiddenFor(m => m.DateRegistered)
@Html.HiddenFor(m => m.UserRolesId)
@Html.HiddenFor(m => m.Id)
@Html.AntiForgeryToken()
<button class="btn btn-primary">Register</button>
}
最后，这是userController的保存操作
Finally here's the save action of the userController
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Save(User user)
{
if (!ModelState.IsValid)
{
var viewModel = new RegisterFormViewModel
{
Users = user,
Teams = _context.Team.ToList()
};
return View("Register", viewModel);
}
if (user.Id == 0)
{
_context.User.Add(user);
}
else
{
var usersInDb = _context.User.Single(m => m.Id == user.Id);
usersInDb.FirstName = user.FirstName;
usersInDb.LastName = user.LastName;
usersInDb.TeamCategory = user.TeamCategory;
usersInDb.RefIndicator = user.RefIndicator;
usersInDb.UserRoles = user.UserRoles;
usersInDb.IsRegistered = user.IsRegistered;
usersInDb.Email = user.Email;
usersInDb.DateRegistered = user.DateRegistered;
}
_context.SaveChanges();
return RedirectToAction("Index", "User");
}
Save Action基本上有两件事...它保存一个新表单，还用于更新数据.
The Save Action basically does two things...It saves a new form and it's also used for updating data.
如果我的代码中的错误可以被发现，将不胜感激.
Would appreciate if the bugs in my code can be fished out.
推荐答案
按照我的理解，您需要将ID设置为自动递增值.
Form what I understand, you need to make ID as auto incremented value.
public class User
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public string RefIndicator { get; set; }
public Team TeamCategory { get; set; }
public byte TeamId { get; set; }
public bool IsRegistered { get; set; }
public DateTime DateRegistered { get; set; }
public DateTime? LastModified { get; set; }
public UserRoles UserRoles { get; set; }
public byte UserRolesId { get; set; }
}
我认为它不适用于byte，但是您可以确定使用int.
I don't think it will work with byte, but you can use int for sure.
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<User>().Property(a => a.Id).HasKey(b => b.Id);
modelBuilder.Entity<User>().Property(a => a.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
}
这篇关于在ASP.NET MVC中插入后表未递增的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
