C # equals

【C # equals]

1. Object. Equals ()

The type of comparison between the current instance and the OBJ parameter depends on whether the current instance is a reference type or a value type.

If the current instance is a reference type, the equals (object) method tests for reference equality, and a call to the equals (object) method is equivalent to a call to the referenceequals method. reference equality means that the object variables that are compared refer to the same object.

using System;// Define a reference type that does not override Equals.public class Person{   private string personName;   public Person(string name)   {      this.personName = name;   }   public override string ToString()   {      return this.personName;   }}public class Example{   public static void Main()   {      Person person1a = new Person("John");      Person person1b = person1a;      Person person2 = new Person(person1a.ToString());      Console.WriteLine("Calling Equals:");       Console.WriteLine("person1a and person1b: {0}", person1a.Equals(person1b));                     Console.WriteLine("person1a and person2: {0}", person1a.Equals(person2));        Console.WriteLine("\nCasting to an Object and calling Equals:");      Console.WriteLine("person1a and person1b: {0}", ((object) person1a).Equals((object) person1b));      Console.WriteLine("person1a and person2: {0}", ((object) person1a).Equals((object) person2));    }}// The example displays the following output://       person1a and person1b: True//       person1a and person2: False//       //       Casting to an Object and calling Equals://       person1a and person1b: True//       person1a and person2: False

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2. valuetype. Equals ()

Compare whether two values are equal.

Refer:

1. http://msdn.microsoft.com/zh-cn/library/bsc2ak47 (V = vs.110). aspx

2. http://msdn.microsoft.com/zh-cn/library/2dts52z7 (V = vs.110). aspx