How to set a default value on a Boolean in a Code First model?

Question

I have an existing table / model into which I want to drop a new Boolean column. This table already has many hundreds of rows of data, and I can\'t touch the existing data.

Answer 1

According to the MSDN, DefaultValueAttribute specifies the default value for a property. You can use DefaultValueAttribute as the following:

public class Revision
{
    ...
    [DefaultValue(true)]
    public Boolean IsReleased { get; set; } = true;
    ....
}

Furthermore you can use UP() method inside of DbMigration class as the following:

public partial class InitializeDb : DbMigration
{
    public override void Up()
    {
            CreateTable(
            "dbo.Revision",
            c => new
                {
                    Id = c.Int(nullable: false, identity: true),
                    ...
                    IsReleased = c.Boolean(nullable: false, defaultValue: true),
                    ...
                })
            .PrimaryKey(t => t.Id);
    }
}

You should add "defaultValue: true" by yourself.