Question

我知道这是一个绝对的保姆，但不知何故，我并没有得到它的支持。可以说，我有一个类Person，如下所示 -

    public class Person
    {
        //Constructor...
        public Person( string name, Gender gender)
        {
            this.Name = name;
            this.Gender = gender;
        }

        //Member variables...


        private string _Name;
        public string Name
        {
            get
            {
                return _Name;
            }
            set
            {
                _Name = value;
            }
        }


        private Gender _Gender;
        public Gender Gender
        {
            get
            {
                return _Gender;
            }
            set
            {
                _Gender = value;
            }
        }
    }

    public enum Gender
    {
        Male = 0,
        Female = 1
    }

我不希望Gender再次成为enum，我希望将其替换为struct并以与上述相同的方式将其作为参数传递到constructor班级的Person时，我create a new object of person class I am able to assign the gender以及那个人。我怎么做？

谢谢。

Answer 1

您可以通过enum以这种方式模仿 struct：

// Gender according ISO/IEC 5218 
// See: http://en.wikipedia.org/wiki/ISO/IEC_5218
public struct Gender {
  private int m_Value;

  private Gender(int value) {
    m_Value = value;
  }

  private Gender() {
    m_Value = 0;
  }

  public int IsoValue {
    get {
      return m_Value; 
    }
  }

  public override int GetHashCode() {
    return m_Value;
  }

  public override bool Equals(object obj) {
    if (!(obj is Gender))
      return false;

    return ((Gender) obj).m_Value == m_Value;
  }

  public static Boolean operator ==(Gender left, Gender right) {
    return left.m_Value == right.m_Value;
  }

  public static Boolean operator !=(Gender left, Gender right) {
    return left.m_Value != right.m_Value;
  } 

  public static readonly Gender Male = new Gender(1);
  public static readonly Gender Female = new Gender(2);
  // E.g. "XYZ Corporation"
  public static readonly Gender NotApplicable = new Gender(5);
  // E.g. "Brown" - Mr or Mrs?
  public static readonly Gender Unknown = new Gender(0);
}

...

class Person {
  public string Name { get; private set; }
  public Gender Gender { get; set; }

  public Person(string name, Gender gender) {
     Name = name;
     Gender = gender;
  }
}

Answer 2

我仍然不明白为什么你必须这样做，但如果你应该这样做，你可以这样做：

    class Person
    {
        public string Name { get; private set; }
        public Gender Gender { get; private set; }

        public Person(string name, Gender gender)
        {
            Name = name;
            Gender = gender;
        }
    }

    struct Gender
    {
        private int _type;

        public bool IsMale
        {
            get { return _type == 0; }
            set { _type = value ? 0 : 1; }
        }

        public bool IsFemale
        {
            get { return _type == 1; }
            set { _type = value ? 1 : 0; }
        }
    }

使用它：

        var p1 = new Person("John", new Gender {IsMale = true});
        var p2 = new Person("Jane", new Gender {IsFemale = true});

将enum替换为类中的struct

2 个答案: