我创建了两个简单的实体 'Member' 和 'Message' 。每个成员可以有多条消息（一对多关系）在尝试创建表时，我在迁移控制台中收到此错误
Sequence contains no matching element
我的会员班
namespace MemberMessage.Models
{
public class Member
{
//[Key]
public int MemberID { get; set; }
[Required]
[StringLength(50)]
[Display(Name = "First Name")]
public string FirstName { get; set; }
[StringLength(50)]
[Display(Name = "Middle Name")]
public string MiddleName { get; set; }
[StringLength(50)]
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Required]
[StringLength(20, ErrorMessage = "User Name not more than 20 characters")]
public string UserName { get; set; }
[DataType(DataType.PhoneNumber, ErrorMessage = "Phone number is not in the correct format")]
public string MobileNumber { get; set; }
[DataType(DataType.EmailAddress)]
public string Emailid { get; set; }
[DataType(DataType.DateTime)]
[DisplayFormat(DataFormatString = "{0:mm-dd-yy}", ApplyFormatInEditMode = true)]
public DateTime DateOfBirth { get; set; }
public string Address { get; set; }
public string MessageTitle { get; set; }
public string FullName { get { return FirstName + " " + MiddleName + " " + LastName; } }
public virtual ICollection<Message> Messages { get; set; }
}
}
消息类
namespace MemberMessage.Models
{
public class Message
{
[Key]
public int MessageID { get; set; }
public int MemberID { get; set; }
[Display(Name = "Messag Title")]
public string MessageTitle { get; set; }
public string MessageContent { get; set; }
[DataType(DataType.DateTime)]
[DisplayFormat(DataFormatString = "{0:dd-mm-yy}")]
public DateTime MessageTime { get; set; }
public virtual Member Member { get; set; }
}
}
和配置播种
internal sealed class Configuration : DbMigrationsConfiguration<MemberMessage.DAL.MemContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = false;
}
protected override void Seed(MemberMessage.DAL.MemContext context)
{
var members = new List<Member>
{
new Member{FirstName ="neil", MiddleName ="s",LastName ="fire1",DateOfBirth = DateTime.Parse("12-05-78"),Emailid ="jj@gmail.com", Address ="nothing",UserName ="fire" ,MobileNumber = "9089898909"},
new Member{FirstName ="aeil", MiddleName ="s",LastName ="fire2",DateOfBirth = DateTime.Parse("12-06-78"),Emailid ="j7j@gmail.com", Address ="nothing",UserName ="fires" ,MobileNumber = "9089868949"},
new Member{FirstName ="ceil", MiddleName ="s",LastName ="fire3",DateOfBirth = DateTime.Parse("12-07-78"),Emailid ="j6j@gmail.com", Address ="nothing",UserName ="fired" ,MobileNumber = "9089895449"},
new Member{FirstName ="feil", MiddleName ="s",LastName ="fire4",DateOfBirth = DateTime.Parse("12-08-78"),Emailid ="j8j@gmail.com", Address ="nhothing",UserName ="firex" ,MobileNumber = "9083898949"},
new Member{FirstName ="reil", MiddleName ="s",LastName ="fire5",DateOfBirth = DateTime.Parse("12-09-78"),Emailid ="j9j@gmail.com", Address ="nothiyng",UserName ="firel" ,MobileNumber = "9082898949"},
new Member{FirstName ="jeil", MiddleName ="s",LastName ="fire6",DateOfBirth = DateTime.Parse("11-06-78"),Emailid ="j3j@gmail.com", Address ="nothihng",UserName ="firey" ,MobileNumber = "9189898949"},
new Member{FirstName ="jril", MiddleName ="s",LastName ="fire7",DateOfBirth = DateTime.Parse("10-06-78"),Emailid ="j2j@gmail.com", Address ="nothing",UserName ="firet" ,MobileNumber = "9089868949"},
new Member{FirstName ="eeil", MiddleName ="s",LastName ="fire8",DateOfBirth = DateTime.Parse("09-06-78"),Emailid ="j1j@gmail.com", Address ="notyhing",UserName ="fireu" ,MobileNumber = "9089898999"},
new Member{FirstName ="heil", MiddleName ="s",LastName ="fire9",DateOfBirth = DateTime.Parse("12-06-88"),Emailid ="j0j@gmail.com", Address ="nothhing",UserName ="firei" ,MobileNumber = "9089898649"},
new Member{FirstName ="ngtl", MiddleName ="s",LastName ="fire0",DateOfBirth = DateTime.Parse("12-06-98"),Emailid ="juj@gmail.com", Address ="nothiyng",UserName ="firen" ,MobileNumber = "9089828949"},
};
members.ForEach(m =>context.Members.AddOrUpdate(p => p.Emailid, m));
context.SaveChanges();
var messages = new List<Message>
{
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="fire").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checksing",MessageContent = "nothing in this",MemberID = members .Single(s=>s.LastName =="fires").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="fired").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="firex").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="firel").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="firey").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="firet").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="fireu").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="firei").MemberID},
new Message {MessageTime = DateTime.Parse("12-08-98"), MessageTitle = "checkring",MessageContent = "nothing in this",MemberID = members.Single(s=> s.LastName =="firen").MemberID},
};
foreach (Message m in messages)
{
var messageindatabase = context.Messages.Where(s => s.MemberID == m.MemberID).SingleOrDefault();
if (messageindatabase == null)
{
context.Messages.Add(m);
}
context.SaveChanges();
}
}