==操作符

1.對於值型別，比較物件的值。
2. 對於string 以外的引用型別，比較兩個物件的地址。
3. 對於 string 型別，比較字串的值。

Object.Equals

1. 對於值型別，比較物件的值。
2. 對於引用型別，比較是否是對同一個物件的引用。

MSDN的說明：

https://msdn.microsoft.com/zh-cn/library/bsc2ak47(v=vs.110).aspx

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