C#输入数据无故突然暂停

public class user
{
public string name;
public int code;
public int login(user[] a)
{
int i = 0;
for (; i < a.Length; i++)
{
if (a[i].name == name && a[i].code == code)
break;
}
return i;
}
public void Displayinof(user[] a, int i)
{
Console.WriteLine("{0}", a[i].name);
Console.WriteLine("{0}", a[i].code);
}
}
user[] a = new user[num];int i=0；
Console.WriteLine("请输入用户名");
a[i].name = Console.ReadLine();//填完用户名后 不显示 请输入密码，为啥？
Console.WriteLine("请输人密码：");
a[i].code = int.Parse(Console.ReadLine());