I have a method that takes a ref string parameter. This is because it
will be called in loops and most of the time it will not need to modify
the paramater at all, so I preferred not to return a newly allocated
string object.
I need to pass items of an array list (can't use specialized collection
in compact framework) to this method. I can't pass the array item
directly because I get a compiler error (a ref or out argument must be
an lvalue). So this is what I'm doing:
string temp = (string)array[i];
obj.refMethod ( ref temp );
array[i] = temp;
I didn't find a performance problem with this, but is there a better way
to write this? 2 1280
"Brad Wood" <bradley_.wood_ @ndsu_.nodak_.e du> wrote in message
news:%2******** **********@TK2M SFTNGP12.phx.gb l... I have a method that takes a ref string parameter. This is because it will be called in loops and most of the time it will not need to modify the paramater at all, so I preferred not to return a newly allocated string object.
I need to pass items of an array list (can't use specialized collection in compact framework) to this method. I can't pass the array item directly because I get a compiler error (a ref or out argument must be an lvalue). So this is what I'm doing: string temp = (string)array[i]; obj.refMethod ( ref temp ); array[i] = temp;
I didn't find a performance problem with this, but is there a better way to write this?
No. ArrayList only looks like an array because of C# indexers.
string temp = (string)arrayLi st[i];
is just syntactic sugar for
string temp = (string)ArrayLi st::get_Item(i) ;
and
arrayList[i] = temp
is
ArrayList::set_ Item(i, temp);
There's no better way to write this.
Even if the C# compiler somehow allowed you to write
obj.refMethod ( ref arrayList[i]);
It would still have to call get_Item/set_Item, and would also need a
temporary variable to hold the result.
David
Not sure its better. But you could propably get rid of the ref method with
something like:
string temp = (string)array[i];
string result = obj.RefMethod( temp ); // Returns null if no change needed.
if ( result != null )
array[i] = result;
--
William Stacey, MVP http://mvp.support.microsoft.com
"Brad Wood" <bradley_.wood_ @ndsu_.nodak_.e du> wrote in message
news:#i******** ******@TK2MSFTN GP12.phx.gbl... I have a method that takes a ref string parameter. This is because it will be called in loops and most of the time it will not need to modify the paramater at all, so I preferred not to return a newly allocated string object.
I need to pass items of an array list (can't use specialized collection in compact framework) to this method. I can't pass the array item directly because I get a compiler error (a ref or out argument must be an lvalue). So this is what I'm doing: string temp = (string)array[i]; obj.refMethod ( ref temp ); array[i] = temp;
I didn't find a performance problem with this, but is there a better way to write this? This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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