C# 实体框架种子问题_C#_Sql_Entity Framework

C# 实体框架种子问题

c# sql entity-framework

C# 实体框架种子问题,c#,sql,entity-framework,C#,Sql,Entity Framework,我创建了两个简单的实体“成员”和“消息”。每个成员可以有多条消息（一对多关系）在尝试创建表时，我在迁移控制台中遇到了如下错误： Sequence contains no matching element 我的会员班 namespace MemberMessage.Models { public class Member { //[Key] public int MemberID { get; set; } [Required]

我创建了两个简单的实体“成员”和“消息”。每个成员可以有多条消息（一对多关系）在尝试创建表时，我在迁移控制台中遇到了如下错误：

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; }


    }
}

播种和配置

 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();
            }

        }

内部密封类配置：dbmigtorinsconfiguration
{
公共配置（）
{
AutomaticMiggerationsEnabled=假；
}
受保护的覆盖无效种子（MemberMessage.DAL.MemContext上下文）
{
var成员=新列表
{
新成员{FirstName=“neil”，MiddleName=“s”，LastName=“fire1”，DateOfBirth=DateTime.Parse（“12-05-78”），Emailid=”jj@gmail.com，Address=“nothing”，UserName=“fire”，MobileNumber=“908909”}，
新成员{FirstName=“aeil”，MiddleName=“s”，LastName=“fire2”，DateOfBirth=DateTime.Parse（“12-06-78”），Emailid=”j7j@gmail.com，Address=“nothing”，UserName=“fires”，MobileNumber=“9089868949”}，
新成员{FirstName=“ceil”，MiddleName=“s”，LastName=“fire3”，DateOfBirth=DateTime.Parse（“12-07-78”），Emailid=”j6j@gmail.com，Address=“nothing”，UserName=“fired”，MobileNumber=“9089895449”}，
新成员{FirstName=“feil”，MiddleName=“s”，LastName=“fire4”，DateOfBirth=DateTime.Parse（“12-08-78”），Emailid=”j8j@gmail.com，Address=“nhothing”，UserName=“firex”，MobileNumber=“90838949”}，
新成员{FirstName=“reil”，MiddleName=“s”，LastName=“fire5”，DateOfBirth=DateTime.Parse（“12-09-78”），Emailid=”j9j@gmail.com，Address=“nothiyng”，UserName=“firel”，MobileNumber=“9082898949”}，
新成员{FirstName=“jeil”，MiddleName=“s”，LastName=“fire6”，DateOfBirth=DateTime.Parse（“11-06-78”），Emailid=”j3j@gmail.com，Address=“nothihng”，UserName=“firey”，MobileNumber=“918949”}，
新成员{FirstName=“jril”，MiddleName=“s”，LastName=“fire7”，DateOfBirth=DateTime.Parse（“10-06-78”），Emailid=”j2j@gmail.com，Address=“nothing”，UserName=“firet”，MobileNumber=“9089868949”}，
新成员{FirstName=“eeil”，MiddleName=“s”，LastName=“fire8”，DateOfBirth=DateTime.Parse（“09-06-78”），Emailid=”j1j@gmail.com，Address=“notyhing”，UserName=“fireu”，MobileNumber=“908999”}，
新成员{FirstName=“heil”，MiddleName=“s”，LastName=“fire9”，DateOfBirth=DateTime.Parse（“12-06-88”），Emailid=”j0j@gmail.com，Address=“nothing”，UserName=“firei”，MobileNumber=“90898649”}，
新成员{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））；
SaveChanges（）；
var messages=新列表
{
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“此中无任何内容”，MemberID=members.Single（s=>s.LastName==“fire”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checksing”，MessageContent=“此中无任何内容”，MemberID=members.Single（s=>s.LastName==“fires”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“此中无任何内容”，MemberID=members.Single（s=>s.LastName==“fired”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“此中无任何内容”，MemberID=members.Single（s=>s.LastName==“firex”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“本中无任何内容”，MemberID=members.Single（s=>s.LastName==“firel”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“本中无任何内容”，MemberID=members.Single（s=>s.LastName==“firey”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“本中无任何内容”，MemberID=members.Single（s=>s.LastName==“firet”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“此中无任何内容”，MemberID=members.Single（s=>s.LastName==“fireu”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“本中无任何内容”，MemberID=members.Single（s=>s.LastName==“firei”）.MemberID}，
新消息{MessageTime=DateTime.Parse（“12-08-98”），MessageTitle=“checkring”，MessageContent=“此中无任何内容”，MemberID=members.Single（s=>s.LastName==“firen”）.MemberID}，
};
foreach（消息中的消息m）
{
var messageindatabase=context.Messages.Where（s=>s.MemberID==m.MemberID）.SingleOrDefault（）；
if（messageindatabase==null）
{
context.Messages.Add（m）；
}
SaveChanges（）；
}
}

异常由

成员.Single（s=>s.LastName==…）

调用引发。这意味着不存在具有指定条件的单个

成员
根据您在成员中输入的数据判断，您可能是指s=>s.UserName
而不是s=>s.LastName
异常是由成员引发的。Single（s=>s.LastName==…）
调用。这意味着不存在具有指定条件的单个成员
根据您在成员
中输入的数据判断，您的意思可能是s=>s.UserName
而不是s=>s.LastName
噢，见鬼！是天堂
 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();
            }

        }