C#•3y ago

set default value of parameter to other parameter [Answered]

ok, i am aware that this is probably not possible, but can i set default value of parameter x to value of parameter y? consider this example:

public void MyMethod(string x, string y=x)
{
  //some code
}

public void MyMethod(string x, string y=x)
{
  //some code
}

would this be possible?

11 Replies

Unknown User•3y ago

Message Not Public

senox13•3y ago

There could absolutely be cases in which that makes sense. You can do that at the beginning of the method and use a sentinel value for the default argument value Or null, since it's a string

Binto86OP•3y ago

i started doing some library that generates some sql from json and i want the user to be able to say that column names are not the same as json fields, i know i can do it with overload, but i wanted to know if it is possible like this, mostly out of curiosity

senox13•3y ago

public void MyMethod(string x, string y=null)
{
  if(y==null)
    x=y;
  //some code
}

public void MyMethod(string x, string y=null)
{
  if(y==null)
    x=y;
  //some code
}

Binto86OP•3y ago

ok thats interesting approach, but at this point i think that it is easier to do it like this:

void MyMethod(string x, string y){
  //my code here
}
void MyMethod(string x)=>MyMethod(x,x);

void MyMethod(string x, string y){
  //my code here
}
void MyMethod(string x)=>MyMethod(x,x);

Unknown User•3y ago

Message Not Public

senox13•3y ago

Yep, both can be used exactly the same ways, though the first would be more DRY to document imo Irrelevant if you aren't adding XML docs

Binto86OP•3y ago

oh i am probably

senox13•3y ago

I'd definitely opt for my initial chunk of code there. It'll be half the typing to document

Binto86OP•3y ago

ok anyways, thanks for help, i am going to close this thread !close

Accord•3y ago

✅ This post has been marked as answered!

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set default value of parameter to other parameter [Answered]