Question

将数据插入数据库时出错。我的数据库列是：

username, password

我将confirmpassword添加到模型中以扩展它。

在使用具有confirmpassword属性的模型时，如何摆脱confirmpassword插入用户名和密码？

我的代码：

BootstrapTrainingEntities db = new BootstrapTrainingEntities();

var u = new User();

u.username = user.username;
u.password = user.password;
// how to I remove or ignore the confirmPassword property when saving?

db.Users.Add(u);
db.SaveChanges();

模型

[MetadataType(typeof(metadataUser))]
public partial class User
{
    public string confirmPassword { get; set; }
}

public class metadataUser
{
    [Required(ErrorMessage = "Username is required", AllowEmptyStrings = false)]
    [Display(Name ="Username")]
    public string username { get; set; }

    [Required(ErrorMessage ="Password is required", AllowEmptyStrings = false)]
    [Display(Name = "Password")]
    [DataType(DataType.Password)]
    public string password { get; set; }

    [Required(ErrorMessage ="Confirmation Password is required", AllowEmptyStrings = false)]
    [Display(Name ="Confiramation Password")]
    [DataType(DataType.Password)]
    [Compare("password",ErrorMessage = "Password does not match")]
    public string confirmPassword { get; set; }
}

Answer 1

此SO有三种不同的解决方案可以帮助您：

How not persist property EF4 code first?

要点：

首先尝试DataAnnotations方法：

确保包含所需的库。然后将[Not Mapped]注释应用于模型中的字段。

using System.ComponentModel.DataAnnotations;

[NotMapped]
public string confirmPassword { get; set; }

如果不这样做，请尝试在dbContext中修改OnModelBuilding方法。这个块有两个选项。第一种是使用Ignore方法。

public class MyContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MetaDataUser>().Ignore(p => p.confirmPassword);
    }
}

第二种是手动重新映射模型构建并排除字段。

可能有用的其他SO答案：

Entity Framework Code First - How to ignore a column when saving

Exclude a field/property from the database with Entity Framework 4 & Code-First

关于如何手动将属性映射到数据库字段的MS Doc：

https://docs.microsoft.com/en-us/ef/core/modeling/relational/columns

提供答案的简洁示例：

http://www.dotnetodyssey.com/2015/03/31/ignore-class-property-to-table-column-in-entity-framework-code-first/

Answer 2

我认为您需要做的是为页面添加一个viewmodel。首先，您将拥有从实体框架生成的模型，如下所示。

public class UserViewModel
{
   public int id{get;set;}

   [Required(ErrorMessage = "Username is required", AllowEmptyStrings = false)]
   [Display(Name ="Username")]
   public string username { get; set; }

   [Required(ErrorMessage ="Password is required", AllowEmptyStrings = false)]
   [Display(Name = "Password")]
   [DataType(DataType.Password)]
   public string password { get; set; }

   [Required(ErrorMessage ="Confirmation Password is required", AllowEmptyStrings = false)]
   [Display(Name ="Confiramation Password")]
   [DataType(DataType.Password)]
   [Compare("password",ErrorMessage = "Password does not match")]
   public string confirmPassword { get; set; }
}

现在为View创建一个viewModel。这可能如下所示。

[HttpPost]
public ActionResult AddUser(UserViewModel model)
{
    User user=new User();
    user.username=model.username;
    user.password=model.password;
    db.User.Add(user);
}

现在在你的控制器动作方法中。你可以这样做。

data(
      [
        {
           "CCODE": "15ET",
            "CNAME": "JOE",
            "CAGE": 32
        },{
           "CCODE": "15ET",
            "CNAME": "JOE",
            "CAGE": 32
        },{
           "CCODE": "15ET",
            "CNAME": "JOE",
            "CAGE": 32
        }
      ]
    )

希望它有所帮助！

在插入实体框架

2 个答案: