动态定义Grid行列

        private void InitRows(int rowCount, Grid g)
        {
            while (rowCount-- > 0)
            {
                RowDefinition rd = new RowDefinition();

               //列宽200

                rd.Height = new GridLength(200);
                g.RowDefinitions.Add(rd);
            }
        }
        private void InitColumns(int colCount, Grid g)
        {
            while (colCount-- > 0)
            {
                ColumnDefinition rd = new ColumnDefinition();
                rd.Width = new GridLength();
                g.ColumnDefinitions.Add(rd);
            }
        }