Vector3D vector1 = new Vector3D(20, 30, 40);//向量1=(20,30,40)
                          Vector3D vector2 = new Vector3D(45, 70, 80);//向量2=(45,70,80)
                          Vector3D crossProduct = new Vector3D();//叉积结果
  
                          crossProduct = Vector3D.CrossProduct(vector1,vector2);//计算向量1×向量2

------解决方案--------------------
用运算符重载：
C# code

public class Vector3D
{
   public double x{get;set;}
   public double y{get;set;}
   public double z{get;set;}
}
public Vector3D operator * (Vector3D lhs,Vector3D rhs)
{
   Vector3D reVector3D = new Vector3D();
   reVector3D.x=lhs.x*rhs.x;
   reVector3D.y=lhs.y*rhs.y;
   reVector3D.z=lhs.z*rhs.z;
   return reVector3D;
}

//调用时：
Vector3D vector1 = new Vector3D(20, 30, 40);//向量1=(20,30,40)
Vector3D vector2 = new Vector3D(45, 70, 80);//向量2=(45,70,80)
Vector3D crossProduct = new Vector3D();//叉积结果
crossProduct=vector1*vector2;

------解决方案--------------------
向量，在3D处理中经常使用，一般用float[]或者double[]表示，

------解决方案--------------------
C#提供了复数及其运算，向量可以表示成复数形式。