C#自定义数据类型的元算符重载与类型转换

using System;

using System.Collections;

namespace MyPractise.CastType

{

class Program

{

static void Main(string [] args)

{

string str = (string )new Person ("John" );

Console .WriteLine(str);//Output John

Person person = str;

Console .WriteLine(person.Name);//Output John

Person person2 = new Person ("Jone" );

Console .WriteLine(person == person2);//Output false

person2 = (Person )str;

Console .WriteLine(person == person2);//Output true

Console .WriteLine(Type .ReferenceEquals(person,person2));//Output false

Console .ReadKey();

}

}

class Person

{

public string Name { get ; set ; }

public Person(string name)

{

Name = name;

}

/// <summary>

/// Overload ==

/// </summary>

/// <param name="left"></param>

/// <param name="right"></param>

/// <returns></returns>

public static bool operator == (Person left,Person right)

{

return left.Name==right.Name;

}

/// <summary>

/// Overload !=

/// </summary>

/// <param name="left"></param>

/// <param name="right"></param>

/// <returns></returns>

public static bool operator !=(Person left, Person right)

{

return left.Name != right.Name;

}

/// <summary>

/// Override Equals

/// </summary>

/// <param name="obj"></param>

/// <returns></returns>

public override bool Equals(object obj)

{

Person equalInstancePerson = (Person )obj;

return this == equalInstancePerson;

}

/// <summary>

/// Override GetHashCode

/// </summary>

/// <returns></returns>

public override int GetHashCode()

{

return base .GetHashCode();

}

/// <summary>

/// Overload Person->string

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

public static explicit operator string (Person person)

{

return person.Name;

}

/// <summary>

/// Overload string->Person

/// </summary>

/// <param name="str"></param>

/// <returns></returns>

public static implicit operator Person (string str)

{

return new Person (str);

}

}

}