怎么将double类型转换成double数组.

如何将double类型转换成double数组...
比如double数组 a={1,2} ;b={3,4}
doulbe c=a[ ]*b[ ] ;
c={3,8};

得到的c 是double类型不是数组，我想得到的c为数组...该怎么转换...


------解决方案--------------------

------解决方案--------------------
double[] d = new double[idf.Length];
for (int i = 0; i < idf.Length; i++)
                        {
                           double c = tf1[i] * idf[i];
                            textBox8.Text += c.ToString() + "\b";
                            d[i] = c;
                            
                             textBox6.Text += d[i];
                             
                        }