c# – 尝试使用if语句的switch语句来找出哪个值更大或更小

这是if else语句

private void RunScript(int a,int b,ref object A)
  {
    if (a < b)
    {
      Print("a is smaller than b");
      Print("b is bigger than a");
    }
    else if (a > b)
    {
      Print("a is bigger than b");
      Print("b is smaller than a");
    }
    else
    {
      Print("a equals b");
    }

这是我想要做的开关

private void RunScript(double a,double b,ref object A)
      {
        double whichIsBigger = a - b;
//below is the 58th line
        switch (whichIsBigger)
        {
          case whichIsBigger < 0:
            Print("a is bigger than b");
            break;
          case whichIsBigger > 0:
            Print("a is smaller than b");
            break;
          default:
            Print("a equals b");
            break;
        }

它给了我这个
错误(CS0151)：开关表达式或大小写标签必须是bool,char,string,integral,enum或相应的可空类型(第58行)

仅供参考,我正在尝试使用rhino公共库在rhinoceros3d上执行此操作.

而且,我一直在努力寻找一个网站或论坛来学习c#
问这样的问题.我结束了.
我认为这类问题非常基本,但我找不到
可以帮我解决这个问题的资源.
我看过几篇帖子,但找不到类似的问题

如果有任何网站可以让人们像聊天室一样快速回答我的问题,
请让我知道.