public static IChartable GetChart(string type)
        {
            IChartable chart = null;

            if (type.Equals("histogram", StringComparison.OrdinalIgnoreCase))
            {
                chart = new HistogramChart();
                Console.WriteLine("初始化设置柱状图...");
            }
            else if (type.Equals("pie", StringComparison.OrdinalIgnoreCase))
            {
                chart = new PieChart();
                Console.WriteLine("初始化设置饼状图...");
            }
            else if (type.Equals("line", StringComparison.OrdinalIgnoreCase))
            {
                chart = new LineChart();
                Console.WriteLine("初始化设置折线图...");
            }

            return(chart);
        }