public partial class tableIsWaringfiled : DbMigration
    {
        public override void Up()
        {
            //設置默認值為true
            AddColumn("dbo.BizMaterial", "IsWarning", c => c.Boolean(nullable: false,defaultValue:true));
            AddColumn("dbo.BizMedicine", "IsWarning", c => c.Boolean(nullable: false
 
, defaultValue: true));
        }
        
        public override void Down()
        {
            DropColumn("dbo.BizMedicine", "IsWarning");
            DropColumn("dbo.BizMaterial", "IsWarning");
        }
    }

abp ef codefirst 設置默認值