如何实现多态

Question

如何用多态重构下面的条件语句
　　
double AddChart()
{
    switch(ChartType)
     {
        case "直方图"：
　　　　    AddColumnChart(sheet,node.Attributes("ChartAddress").Value,ValueRange,XValueRange,ChartWidth,ChartHeight);
            break;
        case "饼图":
            AddPieChart(sheet,node.Attributes("ChartAddress").Value,ValueRange,XValueRange,ChartWidth,ChartHeight);
            break;
        case "条形图":
            AddBarChart(sheet,node.Attributes("ChartAddress").Value,ValueRange,XValueRange,ChartWidth,ChartHeight);
            break;
        case "曲线图"
            AddLineChart(sheet,node.Attributes("ChartAddress").Value,ValueRange,XValueRange,ChartWidth,ChartHeight);
            break;
        default:
            break;
     }
}

Answer 1

代码要写出来太长了,刚学C++时写过一个简单的绘图工具,就用到了多态,和你这个相近....