= = operator compares if object references are same
.Equals() method compares if the contents are same not the object references
In case of string, it always compares on contents not the object references
Example: -
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleAppTest
{
class Program
{
static void Main(string[] args)
{
//case-1
string name = "Ashish";
string myName = name;
Console.WriteLine("== operator result is {0}", name == myName); // True
Console.WriteLine("Equals method result is {0}", name.Equals(myName)); // True
//case-2
object name1 = "sandeep";
char[] values = { 's', 'a', 'n', 'd', 'e', 'e', 'p' };
object myName1 = new string(values);
Console.WriteLine("== operator result is {0}", name1 == myName1); //False
Console.WriteLine("Equals method result is {0}", myName1.Equals(name1)); // True
//case-3
string name2 = "sandeep";
char[] values2 = { 's', 'a', 'n', 'd', 'e', 'e', 'p' };
string myName2 = new string(values2);
Console.WriteLine("== operator result is {0}", name2 == myName2); //True
Console.WriteLine("Equals method result is {0}", myName2.Equals(name2)); // True
//case-3
string name3 = "sandeep";
string myName3 = null;
Console.WriteLine("== operator result is {0}", name3 == myName3); //False
Console.WriteLine("Equals method result is {0}", myName3.Equals(name3)); // Throw error
Console.ReadKey();
}
}
}
.Equals() method compares if the contents are same not the object references
In case of string, it always compares on contents not the object references
Example: -
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleAppTest
{
class Program
{
static void Main(string[] args)
{
//case-1
string name = "Ashish";
string myName = name;
Console.WriteLine("== operator result is {0}", name == myName); // True
Console.WriteLine("Equals method result is {0}", name.Equals(myName)); // True
//case-2
object name1 = "sandeep";
char[] values = { 's', 'a', 'n', 'd', 'e', 'e', 'p' };
object myName1 = new string(values);
Console.WriteLine("== operator result is {0}", name1 == myName1); //False
Console.WriteLine("Equals method result is {0}", myName1.Equals(name1)); // True
//case-3
string name2 = "sandeep";
char[] values2 = { 's', 'a', 'n', 'd', 'e', 'e', 'p' };
string myName2 = new string(values2);
Console.WriteLine("== operator result is {0}", name2 == myName2); //True
Console.WriteLine("Equals method result is {0}", myName2.Equals(name2)); // True
//case-3
string name3 = "sandeep";
string myName3 = null;
Console.WriteLine("== operator result is {0}", name3 == myName3); //False
Console.WriteLine("Equals method result is {0}", myName3.Equals(name3)); // Throw error
Console.ReadKey();
}
}
}
