how to change department id primary key to identity and do migration to database-VBForums
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Thread: how to change department id primary key to identity and do migration to database

  1. #1

    Thread Starter
    Member
    Join Date
    Aug 2016
    Posts
    37

    how to change department id primary key to identity and do migration to database

    Problem

    I need to modify class Department to make Department ID identity then make affect by migrations to database sql server 2005 .

    What I Try

    I changed [DatabaseGenerated(DatabaseGeneratedOption.None)] from None to identity .

    then from console write enable-migrations but it give me message

    Migrations have already been enabled in project 'University Data'. To overwrite

    the existing migrations configuration, use the -Force parameter.I also using

    -Force but no any result or changed happened .

    my class Department

    Code:
    [Table("Department")]
    public partial class Department      { 
    public Department()   
    {    
    }   
    [DatabaseGenerated(DatabaseGeneratedOption.None)] 
    [Key] 
    public int DepartmentID { get; set; } 
    public string DepartmentName { get; set; }  
    
      } 
     }
    I have class department inside container Containerclass as following :

    Code:
    public partial class ContainerClass : DbContext     
     { 
    public ContainerClass() : base("name=mycon")      
     {   
     }   
    public virtual DbSet Departments { get; set; } 
     }
    Table department already created in database.

    update

    i write also in console

    update-database but also nothing changed

    update2

    add-migration Department but also nothing changed column DepartmentID not changed to identity

    update3

    i add migration then write in up() and down()

    Code:
    AlterColumn("dbo.Department", "DepartmentID", c => c.Int(nullable: false, identity: true));
    but it not change column to identity

  2. #2

    Re: how to change department id primary key to identity and do migration to database

    Please write did you decide this problem? If yes, write details. Thank you.

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