[英]code first Entity Framework not saving to database
Ok, I am doing a project with entity framework 6. I have my class laid out. 好的,我正在做一个带有实体框架6的项目。 When I try to add the information to the database; 当我尝试将信息添加到数据库时; it gives me following errors: 它给了我以下错误:
The best overloaded method match for 'System.Data.Entity.DbSet<img_site_codefi.DAL.DefaultConnection>.Add(img_site_codefi.DAL.DefaultConnection)' has some invalid arguments
Argument 1: cannot convert from 'AnonymousType#1' to 'img_site_codefi.DAL.DefaultConnection'
Here is my controller: 这是我的控制器:
public ActionResult Contact(customer cust)
{
try
{
if (ModelState.IsValid)
{
cust.Tele_comp();
saveIntoDb(cust); // database
SendMail(cust); // mail sender
return RedirectToAction("Submited", "Home");
}
return null;
}
catch (DataException)
{
return View(cust);
}
}
private void saveIntoDb(customer cust)
{
using (var cust_In = new DefaultConnection())
{
var customer = new {fname = cust.fname,lname = cust.lname, tele = cust.tele, email = cust.email, reasn = cust.reasn };
//cust_In.customers.Add(customer); //HERE IS THE ERROR!!!
cust_In.SaveChanges();
}
}
and here is the model: 这是模型:
[Key]
[] // how to assign a number automatically
public int Cust_Id { get; set; }
[Required(ErrorMessage = "first name is required!")]
[Display(Name = "First name")]
public string fname { get; set; }
[Display(Name = "Last name")]
public string lname { get; set; }
[Required(ErrorMessage = "area code is required!")]
[StringLength(3)]
[RegularExpression(@"^[0-9]{3,}$", ErrorMessage = "Minimum 3 numbers required & contain only numbers")]
[Display(Name = "Telephone")]
public string tel_area { get; set; }
[Required(ErrorMessage = "first three numbers are required!")]
[StringLength(3)]
[RegularExpression(@"^[0-9]{3,}$", ErrorMessage = "Minimum 3 numbers required & contain only numbers")]
public string fir_thr_tel { get; set; }
[Required(ErrorMessage = "last four numbers are required!")]
[StringLength(4)]
[RegularExpression(@"^[0-9]{4,}$", ErrorMessage = "Minimum 4 numbers required & contain only numbers")]
public string lst_fur_tel { get; set; }
[Required(ErrorMessage = "E-mail is required!")]
[RegularExpression("^[a-zA-Z0-9_\\.-]+@([a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$", ErrorMessage = "E-mail is not valid")]
[Display(Name = "Email")]
public string email { get; set; }
[Required(ErrorMessage = "A reason is required!")]
[Display(Name = "Reason")]
public string reasn { get; set; }
public string tele { get; set; }
Also, how do I generate a number automatically for the "Cust_Id" like a database do with the sql code IDENTITY or computed. 另外,如何像SQL数据库IDENTITY或计算的那样为数据库自动为“ Cust_Id”生成一个数字。
You have 2 problems. 您有2个问题。 First, this line is wrong: 首先,这一行是错误的:
var customer = new {fname = cust.fname,lname = cust.lname, tele = cust.tele, email = cust.email, reasn = cust.reasn };
You are creating an anonymous type instead of a customer
object. 您正在创建匿名类型而不是customer
对象。 Try this instead: 尝试以下方法:
var customer = new customer
{
fname = cust.fname,
lname = cust.lname,
tele = cust.tele,
email = cust.email,
reasn = cust.reasn
};
Secondly your context DefaultConnection
is wrong and contains this: 其次,您的上下文DefaultConnection
错误,并且包含以下内容:
public DbSet<DefaultConnection> customers { get; set; }
You are creating a DbSet of your context class instead of customer
s. 您正在创建上下文类的DbSet而不是customer
。 This should be: 应该是:
public DbSet<customer> customers { get; set; }
You cannot add Anonymous typed class or Dynamic to a DbSet so you need to create an instance class of customer in order to be added to your DbSet. 您不能将Anonymous类型的类或Dynamic添加到DbSet中,因此您需要创建一个Customer的实例类才能将其添加到DbSet中。
public ActionResult Contact(Customer cust)
{
try
{
if (ModelState.IsValid)
{
cust.Tele_comp();
saveIntoDb(cust); // database
SendMail(cust); // mail sender
return RedirectToAction("Submited", "Home");
}
return null;
}
catch (DataException)
{
return View(cust);
}
}
private void saveIntoDb(Customer cust)
{
using (var cust_In = new DbContext())
{
var customer = new Customer {fname = cust.fname,lname = cust.lname, tele = cust.tele, email = cust.email, reasn = cust.reasn };
cust_In.Customers.Add(customer); //HERE IS THE ERROR!!!
cust_In.SaveChanges();
}
}
Also your DbContext.cs class should have this instead of your code: 同样,您的DbContext.cs类应具有以下内容而不是代码:
public DbSet<Customer> Customers { get; set; }
For the generation of primary key you should use this: 为了生成主键,您应该使用以下命令:
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
Make sure you try this tutorial first: http://msdn.microsoft.com/en-us/data/jj572366.aspx 确保首先尝试本教程: http : //msdn.microsoft.com/zh-cn/data/jj572366.aspx
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