DbMigrationExtensions

    public static class DbMigrationExtensions
    {
        public static void AlterDataFileSize(this DbMigration dbMigration, int size)
        {
            var sqlMethod = dbMigration.GetType().GetMethod("Sql", BindingFlags.Instance | BindingFlags.NonPublic);
            sqlMethod.Invoke(dbMigration, new object[] { $@"
                DECLARE @dbName varchar(100) = (SELECT db_name())
                DECLARE @sqlCommand nvarchar(1000) = ('ALTER DATABASE ' + @dbName + ' MODIFY FILE ( NAME = ''' + @dbName +''', SIZE = {size}MB )')
                EXECUTE sp_executesql @sqlCommand, N'@dbName varchar(100)', @dbName = @dbName
            ", true, null });
        }
    }