static void Main(string[] args)
{
InstanceClass operClass = null;
//Console.WriteLine("请输入num1:");
operClass.Num1 = 1;
//Console.WriteLine("请输入num2:");
operClass.Num2 = 2;
Console.WriteLine("请输入符号：");
string oper = Console.ReadLine();
Operation.OperationClass(oper);
double result = operClass.GetResult();
Console.WriteLine("运算结果是：" + result);
Console.Read();
}