new String（）不会在c＃中创建新的引用对象？

Question

Edit:

Why this question is not duplicate? I'm not asking difference between .Equals() and == . I'm asking how does actually == work. I mean, when I created strings using different method, I should have seen different result. But I see same result.

I was looking into == operator in c#. To my surprise it gave same result for following codes (contrary to JAVA). But according to this , == is for reference check and I should see different result for my code then why do I see same result for both of them? Shouldn't I see different results for my piece of codes? Is it because new String() in c# doesn't generate new reference?

 String s = "abc";
 String s1 = "abc";
 Console.WriteLine("Expected output: True, Actual output: " + (s1==s).ToString());

Output

Expected output: True , Actual output: True

Another code check

    String s2 = new String("abc".ToCharArray());
    String s3 = new String("abc".ToCharArray());
    Console.WriteLine("Expected output: False, Actual output: " + (s2 == s3).ToString());

Output

Expected output: False , Actual output: True

Note: I understand difference reference & value check. I've tried result with ReferenceEquals and it shows expected result to me.

Answer 1

Normally for reference types == operator do check for reference equality.

String is also a reference type but in String class == operator is overloaded to check for content equality and not reference equality.

It says and I quote

Determines whether two specified strings have the same value.

Read here https://msdn.microsoft.com/en-us/library/system.string.op_equality(v=vs.110).aspx

FYI, in string != operator is also oveloaded to check for string content inequality.

Answer 2

在c＃中，运算符==用于字符串比较值，而不是引用。