Extract Class From Out Parameters

Question

I have a method with out parameters like:

void Do(int anInput, out List<string> items, out int count)
{
   /* some code */
}

Now I want to transform that signature so that the out parameters are replaced by an object that is returned by that method like:

DoResult Do(int anInput)
{
   /* some code */
   return new DoResult{Items=TODO, Count=TODO};
}

class DoResult {
    public List<string> Items;
    public int Count;
}

Is there a refactoring for such a transformation in Visual Studio 2010 or ReSharper 7?

I know the ReSharper refactoring Extract Class From Parameters. But it seems it doesn't help me for out parameters.

Update: Daniel A. White's answer is very good for .Net 4.0. Is there a solution for .Net 3.5? Generation of a Tuple is also ok.

Do you really need this to be automated? How many places are you going to have to change? It should be fairly easy to do manually. — Jon Skeet
– Jon Skeet, Commented Apr 9, 2013 at 12:48
It would propably be a seldom used feature. But I'm lazy. :-) I got the method with 2 out parameters by ReSharper's Extract Method refactoring. — thersch
– thersch, Commented Apr 9, 2013 at 13:03
But how much work would it be for you to do the refactoring yourself right now, compared with working to find an automated solution? — Jon Skeet
– Jon Skeet, Commented Apr 9, 2013 at 13:06
@JonSkeet What do you want? Do you want to help? Do you want that I delete my question. Of course I asked because I think I can save time in future. — thersch
– thersch, Commented Apr 9, 2013 at 13:10
@JonSkeet c) JetBrains added this feature to ReSharper. See link in Daniel A. White's answer. — thersch
– thersch, Commented Apr 9, 2013 at 13:19

David · Accepted Answer · 2013-04-09 13:01:08Z

3

I found this refactoring in their documentation. It changes it to a Tuple but it should at least get you started.

http://www.jetbrains.com/resharper/webhelp/Refactorings__Transform_Out_Parameters.html

From there, you can do Change Signature.

edited Apr 9, 2013 at 13:01

David

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answered Apr 9, 2013 at 12:49

Daniel A. White

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1 Comment

thersch Over a year ago

Thank you. Unfortunatly I cannot use that refactoring because it is only possible to transform one out parameter. I think this is so because I have a .NET 3.5 solution. (I added the .net3.5 tag now.)

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