二进制运算符的参数之一必须是包含类型

得到一个错误二进制运算符的参数之一必须是包含类型

看不出中操作员过载的错误所在

公共静态Complex运算符出错+（Complex c1，Complex c2）

namespace testComplex
{
    class Program
    {
        public static Complex operator +(Complex c1, Complex c2)
        {
            return new Complex(c1.Real + c2.Real, c1.Imaginary + c2.Imaginary);
        }
        public static Complex operator /(Complex c1, Complex c2)
        {
            return new Complex(c1.Real / c2.Real, c1.Imaginary / c2.Imaginary);
        }
        public static Complex operator *(Complex c1, Complex c2)
        {
            return new Complex(c1.Real * c2.Real, c1.Imaginary * c2.Imaginary + c1.Real * c2.Imaginary + c2.Real * c1.Imaginary);
        }
        public static Complex operator -(Complex c1, Complex c2)
        {
            return new Complex(c1.Real - c2.Real, c1.Imaginary - c2.Imaginary);
        }
        //public static Complex Sqrt -(Complex c1, Complex c2)
        //{
            //return new Complex(c1.Real - c2.Real, c1.Imaginary - c2.Imaginary);
        //}
        static void Main(string[] args)
        {
            Complex a = new Complex(0.5,0);
            Complex b = new Complex(0.6,0);
            //Complex aa = Math.Exp(-(1 / 4) * a * (b / a + Math.Sqrt(-7 * Math.Pow(b, 2) / Math.Pow(a, 2))) / b + (1 / 4) * b * (a / b + Math.Sqrt(-7 * Math.Pow(a, 2) / Math.Pow(b, 2))) / a);
            //Jesus[i] = aa.Real;
            Complex aa = Complex.Exp(-(1 / 4) * a * (b / a + Complex.Sqrt(-7 * Complex.Pow(b, 2) / Complex.Pow(a, 2))) / b + (1 / 4) * b * (a / b + Complex.Sqrt(-7 * Complex.Pow(a, 2) / Complex.Pow(b, 2))) / a);
            Console.WriteLine(aa.Real);
            Console.WriteLine(aa.Imaginary);
            Console.ReadKey();
        }
    }
}