I have been doing my homework for the last few hours. However, I got stuck.

So basically I am trying to assign new value to a string in a Method. This new value must be passed to the method. I tried the following but the test failed. (Please See attached screenshot)

Thank you very much in advance

private string surname;

private string ChangeSurname(ref string surname)
{
    this.surname = "New Value";
    return surname;
}

Note I tried without ref too but it did not solve the problem. Getting the same error message.

CodePudding user response：

1. You don't need pass the argument as reference

2. As you are setting the global value in a private method, the method can be void and not return anything (of course there is no harm in returning it):

   private string surname;
   
   private void ChangeSurname(string newValue)
   {
       this.surname = newValue;
   }
   

or if you need to also return it after setting the value (which I doubt that):

private string ChangeSurname(string newValue)
{
    this.surname = newValue;
    return newValue;
}

CodePudding user response：

String is a reference type & it is immutable. When a reference type variable is passed from one method to another, it doesn't create a new copy; instead, it passes the variable's address. So, If we change the value of a variable in a method, it will also be reflected in the calling method.

public class Name{
    public string Surname { get; set; }
}

public void ChangeSurname(Name name2,string NewVal)
{
    name2.Surname   = NewVal;
}

Now the method ChangeSurname() can be called like as below

    Name name1 = new Name();        
    name1.Surname = "Tiwary";
    ChangeSurname(name1,"Sharma");

Output: Surname "Tiwary" will be changed to "Sharma"