类1

public class NumCon
{
public string zsNum { get; set; }

}

类2

public class RepeatMess //重复数据响应
{
public string desc { get; set; }
public List<NumCon> data { get; set; }
public string code { get; set; }
}

写法二：

public class RepeatMess //重复数据响应

{
public string desc { get; set; }
public List<NumCon> data = new List<NumCon>();
public string code { get; set; }
}