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.

那么为什么跟随代码导致两个不同的方法调用结果Equals方法返回True,而ReferenceEquals方法返回false,即使obj和obj1是引用类型,因为IsClass属性返回true.

using System;

public class Program
{
    public static void Main()
    {
        var obj = new { a = 1,b = 1 };
        var obj1 = new { a = 1,b = 1 };

        Console.WriteLine("obj.IsClass: " + obj.GetType().IsClass);

        Console.WriteLine("object.ReferenceEquals(obj,obj1): " + object.ReferenceEquals(obj,obj1));

        Console.WriteLine("obj.Equals(obj1): " + obj.Equals(obj1));
    }
}

输出：

obj.IsClass: True

object.ReferenceEquals(obj,obj1): False

obj.Equals(obj1): True