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Asked:2020-07-28 23:01:18 +0000 UTC2020-07-28 23:01:18 +0000 UTC

为什么下面的代码会返回错误

  • 772

WorkingClass 是一个静态类，它嵌套了一个成员类，该成员类嵌套了 Loan 类的 List 实例数组。工作类.cs

 public static class WorkingClass
{
    public static Member member;
}

会员.cs

    public class Member
{
    public List<Loan> activeLoans =new List<Loan> { };
}

为什么下面的代码会返回错误？

        Loan loan = new Loan();
        WorkingClass.member.activeLoans.Add(loan);
c#

1 个回答

  1. Best Answer

    因为您没有实例化列表：

    public class WorkingClass
{
  public class member
  {
    public static List<Loan> activeLoans = new List<Loan>();

    或者你没有实例化Member：

    public class WorkingClass
{
  public static Member member = new Member();
    • 3

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