Resharper extract interface from object passed to method

Question

I have a question if Resharper can help me with below problem.

Let's say there is a class with many properties inside:

 public class TestClass {
      public string variableA {get; set;}
      public string variableB {get; set;}
      public int variableC {get; set;}
 }

then somewhere else we have a method that uses TestClass object

 public void TestMethod(TestClass classInstance) {
      classInstance.variableA = 'new value';
      classInstance.variableC = 1;
 }

of course this example is much simplified to the one I have, but I want somehow to extract interface that will have only

variableA
variableC

because then I want to pass it as a parameter to TestMethod. Can ReSharper do it automatically?

Sriram Sakthivel · Accepted Answer · 2015-01-27 20:28:04Z

1

Right click the class
Select Refactor -> Extract -> Extract interface.

It takes you to extract interface window, in which you can select all the properties you want to extract it to a new interface.

In visual studio keyboard scheme shortcut happens to be ctrl + shift + R, x or select "Extract interface".

Once this refactoring is done, it is simply the matter of changing the method's formal parameter to use your interface as opposed to the concrete type.

edited Jan 27, 2015 at 20:28

answered Jan 27, 2015 at 20:22

Sriram Sakthivel

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3 Comments

danrok Over a year ago

I saw that of course, but this extract interface window does not select all variables from that object that are used within method. This is my concern - if it can be automatically selected, as number of properties which are used are not so small and I want to perform this operation in many places.

John Saunders Over a year ago

So, in other words, no, it can't do it automatically.

Sriram Sakthivel Over a year ago

@Konrad This is the best you can get AFAIK.

danrok · Accepted Answer · 2015-02-01 14:47:23Z

0

I did what I wanted and I want to share solution, or maybe better say small workaround.

first what I did was to create an interface that contained all properties from the TestClass.
I changed method signature to get this interface instead of class itself.
I turned on wide analysis in R# and checked which properties are not used and removed them from the interface.

Maybe someone will need this in future when refactoring. Anyway - thanks for your help!

answered Feb 1, 2015 at 14:47

danrok

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