C# ASP.NET MVC CRUD带有LocalDb savechanges错误
我使用的是VS 2015,我创建了一个ASP.NET MVC项目,并添加了一些有用的东西(登录和注册在名为C# ASP.NET MVC CRUD带有LocalDb savechanges错误,c#,asp.net-mvc,localdb,C#,Asp.net Mvc,Localdb,我使用的是VS 2015,我创建了一个ASP.NET MVC项目,并添加了一些有用的东西(登录和注册在名为MyDatabase.mdf的Localdb中运行良好) CRUD仅在db中创建函数,其余函数将稍后提供 但现在我找不到这份工作。在名为MyDatabase.mdf的本地数据库中,我创建了另一个名为Amsterdam的表: [MyDatabase.mdf][1] 这是我的MainDbContext.cs——我在这里添加了 public DbSet<Amsterdam> Amste
MyDatabase.mdf
的Localdb中运行良好)
CRUD仅在db中创建函数,其余函数将稍后提供
但现在我找不到这份工作。在名为MyDatabase.mdf
的本地数据库中,我创建了另一个名为Amsterdam
的表:
[MyDatabase.mdf][1]
这是我的MainDbContext.cs
——我在这里添加了
public DbSet<Amsterdam> Amsterdam { get; set; }
在我的Models
文件夹中,我创建了Amsterdam.cs
,如下所示:
@model IEnumerable<MyFirstWebsite.Models.Amsterdam>
@{
ViewBag.Title = "Amsterdam";
var username = User.Identity.Name;
}
<h2>@username's Bestellijst Amsterdam</h2>
@using (Html.BeginForm())
{
<span>Enter new item: </span>
<br/>
<input type="text" name="new_item"/>
<br/>
<span>Public post?</span>
<input type="checkbox" name="check_public"/><br/>
<br/>
<input type="submit" value="Add Item"/>
}
<br/>
<table class="table table-bordered table-condensed">
<thead>
<tr>
<th style="text-align: center;">Id Bestelling</th>
<th style="text-align: center;">Details Bestelling</th>
<th style="text-align: center;">Time - Ontvangen Bestelling</th>
<th style="text-align: center;">Time - Verzonden Bestelling</th>
<th style="text-align: center;">Edit</th>
<th style="text-align: center;">Delete</th>
<th style="text-align: center;">Public Post</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;"></td>
<td style="text-align: center;"></td>
<td style="text-align: center;"></td>
<td style="text-align: center;"></td>
<td style="text-align: center;">
<a href="@Url.Action("Edit", "Home")/">Edit</a>
</td>
<td style="text-align: center;">
<a href="@Url.Action("Delete", "Home")/">Edit</a>
</td>
<td style="text-align: center;"></td>
</tr>
</tbody>
</table>
namespace MyFirstWebsite.Models
{
public class Amsterdam
{
[Key]
public int Id { get; set; }
public string Details { get; set; }
public string Date_Posted { get; set; }
public string Time_Posted { get; set; }
public string Date_Edited { get; set; }
public string Time_Edited { get; set; }
public string Public { get; set; }
public int User_Id { get; set; }
}
}
public ActionResult Amsterdam()
{
return View();
}
[HttpPost]
public ActionResult Amsterdam(Amsterdam list)
{
string timeToday = DateTime.Now.ToString("h:mm:ss tt");
string dateToday = DateTime.Now.ToString("M/dd/yyyy");
if (ModelState.IsValid)
{
using (var db = new MainDbContext())
{
Claim sessionEmail = ClaimsPrincipal.Current.FindFirst(ClaimTypes.Email);
string userEmail = sessionEmail.Value;
var userIdQuery = db.Users.Where(u => u.Email == userEmail).Select(u => u.Id);
var userId = userIdQuery.ToList();
var dbAmsterdam = db.Amsterdam.Create();
dbAmsterdam.Details = list.Details;
dbAmsterdam.Date_Posted = dateToday;
dbAmsterdam.Time_Posted = timeToday;
dbAmsterdam.User_Id = userId[0];
db.Amsterdam.Add(dbAmsterdam);
db.SaveChanges();
}
}
else
{
ModelState.AddModelError("", "Incorrect format has been placed");
}
return View();
}
在我的控制器
文件夹中,我的家庭控制器
如下所示:
@model IEnumerable<MyFirstWebsite.Models.Amsterdam>
@{
ViewBag.Title = "Amsterdam";
var username = User.Identity.Name;
}
<h2>@username's Bestellijst Amsterdam</h2>
@using (Html.BeginForm())
{
<span>Enter new item: </span>
<br/>
<input type="text" name="new_item"/>
<br/>
<span>Public post?</span>
<input type="checkbox" name="check_public"/><br/>
<br/>
<input type="submit" value="Add Item"/>
}
<br/>
<table class="table table-bordered table-condensed">
<thead>
<tr>
<th style="text-align: center;">Id Bestelling</th>
<th style="text-align: center;">Details Bestelling</th>
<th style="text-align: center;">Time - Ontvangen Bestelling</th>
<th style="text-align: center;">Time - Verzonden Bestelling</th>
<th style="text-align: center;">Edit</th>
<th style="text-align: center;">Delete</th>
<th style="text-align: center;">Public Post</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center;"></td>
<td style="text-align: center;"></td>
<td style="text-align: center;"></td>
<td style="text-align: center;"></td>
<td style="text-align: center;">
<a href="@Url.Action("Edit", "Home")/">Edit</a>
</td>
<td style="text-align: center;">
<a href="@Url.Action("Delete", "Home")/">Edit</a>
</td>
<td style="text-align: center;"></td>
</tr>
</tbody>
</table>
namespace MyFirstWebsite.Models
{
public class Amsterdam
{
[Key]
public int Id { get; set; }
public string Details { get; set; }
public string Date_Posted { get; set; }
public string Time_Posted { get; set; }
public string Date_Edited { get; set; }
public string Time_Edited { get; set; }
public string Public { get; set; }
public int User_Id { get; set; }
}
}
public ActionResult Amsterdam()
{
return View();
}
[HttpPost]
public ActionResult Amsterdam(Amsterdam list)
{
string timeToday = DateTime.Now.ToString("h:mm:ss tt");
string dateToday = DateTime.Now.ToString("M/dd/yyyy");
if (ModelState.IsValid)
{
using (var db = new MainDbContext())
{
Claim sessionEmail = ClaimsPrincipal.Current.FindFirst(ClaimTypes.Email);
string userEmail = sessionEmail.Value;
var userIdQuery = db.Users.Where(u => u.Email == userEmail).Select(u => u.Id);
var userId = userIdQuery.ToList();
var dbAmsterdam = db.Amsterdam.Create();
dbAmsterdam.Details = list.Details;
dbAmsterdam.Date_Posted = dateToday;
dbAmsterdam.Time_Posted = timeToday;
dbAmsterdam.User_Id = userId[0];
db.Amsterdam.Add(dbAmsterdam);
db.SaveChanges();
}
}
else
{
ModelState.AddModelError("", "Incorrect format has been placed");
}
return View();
}
我知道我靠得很近,因为我的注册器可以工作,但我无法让阿姆斯特丹的CRUD工作。当我单击屏幕截图中所示的确定时(当我单击广告项时):
我犯了一个错误
用户代码未处理DbUpdateException
似乎EF正在对对象名进行复数化,以定义数据库中的表名(来自错误-
无效对象名dbo.Amsterdams
)
如果表名为Amsterdam
(单数,不带尾随的“s”),则将此数据注释添加到模型类中:
[Table("Amsterdam")]
public class Amsterdam
{
[Key]
public int Id { get; set; }
.....
}
如果要完全关闭表名的多重化,可以将此行添加到MainDbContext
类中:
protected override void OnModelCreating(DbModelBuilder dbModelBuilder)
{
dbModelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
protectedoverride void OnModelCreating(DbModelBuilder DbModelBuilder)
{
dbModelBuilder.Conventions.Remove();
}
它还表示“查看内部异常”。是吗?它说什么?{“无效的对象名'dbo.Amsterdams'。}db.Amsterdam.Create()
?这是做什么的?在代码库中创建Amsterdam表。它起作用了。我将notnull改为NULL,然后工作了Shyju,这要感谢内部的异常,但没有看到这一点。