“Parameter count mismatch” error during adding Entity Framework migration under .NET Core 2.0
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After migration of my project to .NET Core 2.0, fresh install of Visual Studio 15.5 and .NET CORE sdk 2.1.2, I am having an error when trying to add a migration using EF Core.
C:ProjectsSQLwalletSQLwallet>dotnet ef migrations add IdentityServer.
An error occurred while calling method 'BuildWebHost' on class 'Program'.
Continuing without the application service provider. Error: Parameter count mismatch.
Done. To undo this action, use 'ef migrations remove'
As a result an empty migration class is created, with empty Up() and Down() methods.
The program.cs looks like:
public class Program
{
public static IWebHost BuildWebHost(string args, string environmentName)
{...}
public static void Main(string args)
{
IWebHost host;
host = BuildWebHost(args, "Development");
Please advise. The migration worked fine while on Core 1.0. I have a IDesignTimeDbContextFactory implemented, and my DBContext class has a parameterless constructor, so it could not be the reason.
asp.net-core entity-framework-core ef-migrations asp.net-core-2.0
asked Dec 7 '17 at 9:52
Glebby
1116
add a comment |
up vote
2
down vote
favorite
After migration of my project to .NET Core 2.0, fresh install of Visual Studio 15.5 and .NET CORE sdk 2.1.2, I am having an error when trying to add a migration using EF Core.
C:ProjectsSQLwalletSQLwallet>dotnet ef migrations add IdentityServer.
An error occurred while calling method 'BuildWebHost' on class 'Program'.
Continuing without the application service provider. Error: Parameter count mismatch.
Done. To undo this action, use 'ef migrations remove'
As a result an empty migration class is created, with empty Up() and Down() methods.
The program.cs looks like:
public class Program
{
public static IWebHost BuildWebHost(string args, string environmentName)
{...}
public static void Main(string args)
{
IWebHost host;
host = BuildWebHost(args, "Development");
Please advise. The migration worked fine while on Core 1.0. I have a IDesignTimeDbContextFactory implemented, and my DBContext class has a parameterless constructor, so it could not be the reason.
asp.net-core entity-framework-core ef-migrations asp.net-core-2.0
asked Dec 7 '17 at 9:52
Glebby
1116
You can safely ignore the message. It will go away when issue #9076 is resolved.
– bricelam
Dec 8 '17 at 0:10
The problem is that the migration is not generating properly, it is empty.
– Glebby
Dec 8 '17 at 7:50
add a comment |
up vote
2
down vote
favorite
up vote
2
down vote
favorite
After migration of my project to .NET Core 2.0, fresh install of Visual Studio 15.5 and .NET CORE sdk 2.1.2, I am having an error when trying to add a migration using EF Core.
C:ProjectsSQLwalletSQLwallet>dotnet ef migrations add IdentityServer.
An error occurred while calling method 'BuildWebHost' on class 'Program'.
Continuing without the application service provider. Error: Parameter count mismatch.
Done. To undo this action, use 'ef migrations remove'
As a result an empty migration class is created, with empty Up() and Down() methods.
The program.cs looks like:
public class Program
{
public static IWebHost BuildWebHost(string args, string environmentName)
{...}
public static void Main(string args)
{
IWebHost host;
host = BuildWebHost(args, "Development");
Please advise. The migration worked fine while on Core 1.0. I have a IDesignTimeDbContextFactory implemented, and my DBContext class has a parameterless constructor, so it could not be the reason.
asp.net-core entity-framework-core ef-migrations asp.net-core-2.0
asked Dec 7 '17 at 9:52
Glebby
1116
After migration of my project to .NET Core 2.0, fresh install of Visual Studio 15.5 and .NET CORE sdk 2.1.2, I am having an error when trying to add a migration using EF Core.
C:ProjectsSQLwalletSQLwallet>dotnet ef migrations add IdentityServer.
An error occurred while calling method 'BuildWebHost' on class 'Program'.
Continuing without the application service provider. Error: Parameter count mismatch.
Done. To undo this action, use 'ef migrations remove'
As a result an empty migration class is created, with empty Up() and Down() methods.
The program.cs looks like:
public class Program
{
public static IWebHost BuildWebHost(string args, string environmentName)
{...}
public static void Main(string args)
{
IWebHost host;
host = BuildWebHost(args, "Development");
Please advise. The migration worked fine while on Core 1.0. I have a IDesignTimeDbContextFactory implemented, and my DBContext class has a parameterless constructor, so it could not be the reason.
asp.net-core entity-framework-core ef-migrations asp.net-core-2.0
asp.net-core entity-framework-core ef-migrations asp.net-core-2.0
asked Dec 7 '17 at 9:52
Glebby
1116
asked Dec 7 '17 at 9:52
Glebby
1116
edited Dec 7 '17 at 13:29
asked Dec 7 '17 at 9:52
Glebby
1116
asked Dec 7 '17 at 9:52
Glebby
1116
asked Dec 7 '17 at 9:52
Glebby
1116
1116
You can safely ignore the message. It will go away when issue #9076 is resolved.
– bricelam
Dec 8 '17 at 0:10
The problem is that the migration is not generating properly, it is empty.
– Glebby
Dec 8 '17 at 7:50
add a comment |
You can safely ignore the message. It will go away when issue #9076 is resolved.
– bricelam
Dec 8 '17 at 0:10
The problem is that the migration is not generating properly, it is empty.
– Glebby
Dec 8 '17 at 7:50
You can safely ignore the message. It will go away when issue #9076 is resolved.
– bricelam
Dec 8 '17 at 0:10
You can safely ignore the message. It will go away when issue #9076 is resolved.
– bricelam
Dec 8 '17 at 0:10
The problem is that the migration is not generating properly, it is empty.
– Glebby
Dec 8 '17 at 7:50
The problem is that the migration is not generating properly, it is empty.
– Glebby
Dec 8 '17 at 7:50
add a comment |
2 Answers
2
active
oldest
votes
up vote
2
down vote
Take a look at the OnModelCreating method in your DbContext. Make sure it calls base.OnModelCreating(builder). It should look something like:
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.Entity<T>().HasData(...);
}
If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable.
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
add a comment |
up vote
1
down vote
My solution is to pass Array to HasData function, not generic List.
If you use List, try to convert array with ToArray function.
answered Nov 20 at 6:06
ddagsan
1,0201212
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Take a look at the OnModelCreating method in your DbContext. Make sure it calls base.OnModelCreating(builder). It should look something like:
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.Entity<T>().HasData(...);
}
If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable.
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
add a comment |
up vote
2
down vote
Take a look at the OnModelCreating method in your DbContext. Make sure it calls base.OnModelCreating(builder). It should look something like:
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.Entity<T>().HasData(...);
}
If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable.
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
add a comment |
up vote
2
down vote
up vote
2
down vote
Take a look at the OnModelCreating method in your DbContext. Make sure it calls base.OnModelCreating(builder). It should look something like:
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.Entity<T>().HasData(...);
}
If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable.
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
Take a look at the OnModelCreating method in your DbContext. Make sure it calls base.OnModelCreating(builder). It should look something like:
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
builder.Entity<T>().HasData(...);
}
If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable.
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
answered Sep 27 at 11:49
Connell.O'Donnell
1,3382525
1,3382525
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
add a comment |
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
Very helpful: "If you are using builder.Entity<T>().HasData(...) to seed your data, make sure you pass it a T and not an IEnumerable"
– JuanK
Oct 15 at 7:41
add a comment |
up vote
1
down vote
My solution is to pass Array to HasData function, not generic List.
If you use List, try to convert array with ToArray function.
answered Nov 20 at 6:06
ddagsan
1,0201212
add a comment |
up vote
1
down vote
My solution is to pass Array to HasData function, not generic List.
If you use List, try to convert array with ToArray function.
answered Nov 20 at 6:06
ddagsan
1,0201212
add a comment |
up vote
1
down vote
up vote
1
down vote
My solution is to pass Array to HasData function, not generic List.
If you use List, try to convert array with ToArray function.
answered Nov 20 at 6:06
ddagsan
1,0201212
My solution is to pass Array to HasData function, not generic List.
If you use List, try to convert array with ToArray function.
answered Nov 20 at 6:06
ddagsan
1,0201212
answered Nov 20 at 6:06
ddagsan
1,0201212
answered Nov 20 at 6:06
ddagsan
1,0201212
answered Nov 20 at 6:06
ddagsan
1,0201212
1,0201212
add a comment |
add a comment |
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You can safely ignore the message. It will go away when issue #9076 is resolved.
– bricelam
Dec 8 '17 at 0:10
The problem is that the migration is not generating properly, it is empty.
– Glebby
Dec 8 '17 at 7:50