C# Programming - Strings - Discussion

Discussion Forum : Strings - General Questions (Q.No. 3)
Which of the following statements will correctly copy the contents of one string into another ?
String s1 = "String";
String s2; 
s2 = s1;
String s1 = "String" ; 
String s2;
s2 = String.Concat(s1, s2);
String s1 = "String"; 
String s2;
s2 = String.Copy(s1);
String s1 = "String"; 
String s2;
s2 = s1.Replace();
String s1 = "String"; 
String s2;
s2 = s2.StringCopy(s1);
Answer: Option
No answer description is available. Let's discuss.
14 comments Page 1 of 2.

Naresh said:   8 years ago
Will get same object name.

String s1 = "String";
String s2;
s2 = String.Copy(s1);

Pankaj mehta said:   9 years ago
Case A one references got copied.

Mean both string now got started to point same [Memory].

Case C exact data is copied in other string.

Nasser Amira said:   9 years ago
Awesome discussion. In response to @Nichholas, when you run the following the console return true actually not false.

String s1 = "String";
String s2;
s2 = s1;
Console.Write(object.ReferenceEquals(s1, s2));

Dheer said:   10 years ago
String s2, s1 = "string";

s2 = s1;

Vijay said:   10 years ago
If you refer to the first question in strings, it clearly mentions strings are immutable and CLR optimizes memory by interning same strings into one.

If Option 3 is correct, does it not defeat the above fact ?

Max said:   1 decade ago

Acc. to question we need to copy the contents of one string into another.


Option-1 : Incorrect, String s1 = "String" when executed will create a "String" object. s2 = s1 doesn't copies the content rather it passes its reference to variable s2. Only 1 Object is created both s1 and s2 referring same object.

Option-2 : Obviously Incorrect answer, Reason Strings are immutable

Option-3 : Correct, because here we are only copying the content , so in end we will have 2 objects . By value they are same but by reference they are different.

Option-4 : No overload for method 'Replace' takes '0' arguments.

Option-5 : Type 'string' does not contain a definition for 'StringCopy' and no extension method 'StringCopy' of type 'string' could be found.

Thank You :).

Nichholas Mahbouby said:   1 decade ago
s1 = s2 will result in 2 variables that reference the same object.

s2 = string.Copy(s1) will result in 2 variables that reference different objects containing the same value. Console.Write(object.ReferenceEquals(s1, s2)) will output "False".

Sami said:   1 decade ago
When s1="string"; here a reference points to the "string". and when.

s2=s1; here s2 also points to the "string". and same is the case.

When s2 = String.Copy (s1) ;. So why 1st is not right. Can any please tell the difference?

Mahi said:   1 decade ago
Can't find the difference.

Can anyone tell clearly.

Zeel said:   1 decade ago
Yes exactly this is also right.

String s1 = "String";
String s2;
s2 = s1;

//It is also right.

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