if (Object.ReferenceEquals(str1,str2))

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication9
{
    class Program
    {
        static void Main(string[] args)
        {
            Program a = new Program();
            Program b = new Program();
            if (a.Equals(b))
            {
                Console.WriteLine("a=b");
            }
            Console.WriteLine("a:{0}", a.GetHashCode());
            Console.WriteLine("b:{0}", b.GetHashCode());
            Program c = a;
            if (a.Equals(c))
            {
                Console.WriteLine("a=c");
            }
            String str1 = new String("Hello".ToCharArray());
            String str2 = new String("Hello".ToCharArray());
            if (str1.Equals(str2))
            {
                Console.WriteLine("str1=str2");
            }
            if (str1==str2)
            {
                Console.WriteLine("str1=str2");
            }
            Console.WriteLine("str1:{0}", str1.GetHashCode());
            Console.WriteLine("str2:{0}", str2.GetHashCode());
            if (Object.ReferenceEquals(str1,str2))
            {
                Console.WriteLine("Object.ReferenceEquals(str1,str2)");
            }
            else
            {
                Console.WriteLine("Object.Reference not Equals(str1,str2)");
            }

}
}
}
/*
a:46104728
b:12289376
a=c
str1=str2
str1=str2
str1:-694847
str2:-694847
Object.Reference not Equals(str1,str2)
请按任意键继续. . .
*/

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