EF does not recognize new Properties
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Last week I created my models for this project, but needed to update them this week. First my "Person" class only had a "Name" property and now it has a "Firstname" and a "Lastname" property. Now I get an exception about the "Name" property, which doesn't even exist anymore.
The DB is not being created either, which is most likely a subsequent error.
Class Person
abstract class Person
{
[Key]
public int Id { get; set; }
[MaxLength(100)]
public string Firstname { get; set; }
[MaxLength(100)]
public string Lastname { get; set; }
public int Age { get; set; }
}
Class Student
class Student : Person
{
public School School { get; set; }
public virtual ICollection<Order> Orders { get; set; } = new List<Order>();
}
Trying to add a Student
using (var ctx = new SchoolDbContext())
{
ctx.Persons.Add(new Student() {Firstname="Test" });
ctx.SaveChanges();
}
DBContext
class SchoolDbContext : DbContext
{
public SchoolDbContext() : base("SchoolDB")
{
}
public DbSet<Person> Persons { get; set; }
public DbSet<School> Schools { get; set; }
public DbSet<AArticle> Articles { get; set; }
public DbSet<APublisher> APublishers { get; set; }
public DbSet<Order> Orders { get; set; }
public DbSet<Subject> Subjects { get; set; }
}
The Exception
System.InvalidOperationException: "The property 'Name' is not a String or Byte array. Length can only be configured for String and Byte array properties."
I tried cleaning the solution, restarting VS, rebuilding and recleaning... Cannot drop the DB as no DB is created.
How do I inform the compiler that the "Name" property does not exist anymore, as he does not get it himself?
c# entity-framework model
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
add a comment |
Last week I created my models for this project, but needed to update them this week. First my "Person" class only had a "Name" property and now it has a "Firstname" and a "Lastname" property. Now I get an exception about the "Name" property, which doesn't even exist anymore.
The DB is not being created either, which is most likely a subsequent error.
Class Person
abstract class Person
{
[Key]
public int Id { get; set; }
[MaxLength(100)]
public string Firstname { get; set; }
[MaxLength(100)]
public string Lastname { get; set; }
public int Age { get; set; }
}
Class Student
class Student : Person
{
public School School { get; set; }
public virtual ICollection<Order> Orders { get; set; } = new List<Order>();
}
Trying to add a Student
using (var ctx = new SchoolDbContext())
{
ctx.Persons.Add(new Student() {Firstname="Test" });
ctx.SaveChanges();
}
DBContext
class SchoolDbContext : DbContext
{
public SchoolDbContext() : base("SchoolDB")
{
}
public DbSet<Person> Persons { get; set; }
public DbSet<School> Schools { get; set; }
public DbSet<AArticle> Articles { get; set; }
public DbSet<APublisher> APublishers { get; set; }
public DbSet<Order> Orders { get; set; }
public DbSet<Subject> Subjects { get; set; }
}
The Exception
System.InvalidOperationException: "The property 'Name' is not a String or Byte array. Length can only be configured for String and Byte array properties."
I tried cleaning the solution, restarting VS, rebuilding and recleaning... Cannot drop the DB as no DB is created.
How do I inform the compiler that the "Name" property does not exist anymore, as he does not get it himself?
c# entity-framework model
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
Do tou have any migrations?
– Aldert
Nov 23 '18 at 21:11
add a comment |
Last week I created my models for this project, but needed to update them this week. First my "Person" class only had a "Name" property and now it has a "Firstname" and a "Lastname" property. Now I get an exception about the "Name" property, which doesn't even exist anymore.
The DB is not being created either, which is most likely a subsequent error.
Class Person
abstract class Person
{
[Key]
public int Id { get; set; }
[MaxLength(100)]
public string Firstname { get; set; }
[MaxLength(100)]
public string Lastname { get; set; }
public int Age { get; set; }
}
Class Student
class Student : Person
{
public School School { get; set; }
public virtual ICollection<Order> Orders { get; set; } = new List<Order>();
}
Trying to add a Student
using (var ctx = new SchoolDbContext())
{
ctx.Persons.Add(new Student() {Firstname="Test" });
ctx.SaveChanges();
}
DBContext
class SchoolDbContext : DbContext
{
public SchoolDbContext() : base("SchoolDB")
{
}
public DbSet<Person> Persons { get; set; }
public DbSet<School> Schools { get; set; }
public DbSet<AArticle> Articles { get; set; }
public DbSet<APublisher> APublishers { get; set; }
public DbSet<Order> Orders { get; set; }
public DbSet<Subject> Subjects { get; set; }
}
The Exception
System.InvalidOperationException: "The property 'Name' is not a String or Byte array. Length can only be configured for String and Byte array properties."
I tried cleaning the solution, restarting VS, rebuilding and recleaning... Cannot drop the DB as no DB is created.
How do I inform the compiler that the "Name" property does not exist anymore, as he does not get it himself?
c# entity-framework model
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
Last week I created my models for this project, but needed to update them this week. First my "Person" class only had a "Name" property and now it has a "Firstname" and a "Lastname" property. Now I get an exception about the "Name" property, which doesn't even exist anymore.
The DB is not being created either, which is most likely a subsequent error.
Class Person
abstract class Person
{
[Key]
public int Id { get; set; }
[MaxLength(100)]
public string Firstname { get; set; }
[MaxLength(100)]
public string Lastname { get; set; }
public int Age { get; set; }
}
Class Student
class Student : Person
{
public School School { get; set; }
public virtual ICollection<Order> Orders { get; set; } = new List<Order>();
}
Trying to add a Student
using (var ctx = new SchoolDbContext())
{
ctx.Persons.Add(new Student() {Firstname="Test" });
ctx.SaveChanges();
}
DBContext
class SchoolDbContext : DbContext
{
public SchoolDbContext() : base("SchoolDB")
{
}
public DbSet<Person> Persons { get; set; }
public DbSet<School> Schools { get; set; }
public DbSet<AArticle> Articles { get; set; }
public DbSet<APublisher> APublishers { get; set; }
public DbSet<Order> Orders { get; set; }
public DbSet<Subject> Subjects { get; set; }
}
The Exception
System.InvalidOperationException: "The property 'Name' is not a String or Byte array. Length can only be configured for String and Byte array properties."
I tried cleaning the solution, restarting VS, rebuilding and recleaning... Cannot drop the DB as no DB is created.
How do I inform the compiler that the "Name" property does not exist anymore, as he does not get it himself?
c# entity-framework model
c# entity-framework model
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
asked Nov 23 '18 at 19:13
MreifenbergerMreifenberger
104
104
Do tou have any migrations?
– Aldert
Nov 23 '18 at 21:11
add a comment |
Do tou have any migrations?
– Aldert
Nov 23 '18 at 21:11
Do tou have any migrations?
– Aldert
Nov 23 '18 at 21:11
Do tou have any migrations?
– Aldert
Nov 23 '18 at 21:11
add a comment |
1 Answer
1
active
oldest
votes
You need to sync your database with your code by so-called migrations:
- ef core: https://docs.microsoft.com/de-de/ef/core/managing-schemas/migrations/
- ef 6: https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You need to sync your database with your code by so-called migrations:
- ef core: https://docs.microsoft.com/de-de/ef/core/managing-schemas/migrations/
- ef 6: https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
add a comment |
You need to sync your database with your code by so-called migrations:
- ef core: https://docs.microsoft.com/de-de/ef/core/managing-schemas/migrations/
- ef 6: https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
add a comment |
You need to sync your database with your code by so-called migrations:
- ef core: https://docs.microsoft.com/de-de/ef/core/managing-schemas/migrations/
- ef 6: https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
You need to sync your database with your code by so-called migrations:
- ef core: https://docs.microsoft.com/de-de/ef/core/managing-schemas/migrations/
- ef 6: https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
answered Nov 24 '18 at 12:44
GrimmGrimm
211211
211211
add a comment |
add a comment |
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Do tou have any migrations?
– Aldert
Nov 23 '18 at 21:11