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  • 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("
    Casting 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
    View Code

     

    2、ValueType.Equals()

      比较两个值是否相等。

    参考:

    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

     

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  • 原文地址:https://www.cnblogs.com/tekkaman/p/3854160.html
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