ReSharper Help

Replace Constructor with Factory Method

ReSharper | Refactor | Convert | Constructor to Factory Method…
ReSharper_Constructor2FactoryMethodAction

This refactoring helps implement the factory method pattern for an existing class. If you opt to create the factory method in the same class, the refactoring makes the selected constructor private and encapsulates it into a static method that returns a new instance of the class. You can als choose to create the factory method in any other class. In this case, the constructor stays public, you can change its access modifier later, if necessary.

If there are any usages of the constructor, they are replaced with factory method calls.

In the example below, we use the refactoring to add the factory method in the same class:

Before refactoringAfter refactoring
class Foo { public Foo() { // instance initialization } }
class Foo { public static Foo CreateFoo() { return new Foo(); } private Foo() { // instance initialization } }

To replace a constructor with a factory method

  1. In the editor, place the caret at a constructor or choose a constructor in the File Structure window.
  2. Do one of the following:
    • Press Ctrl+Shift+R and then choose Replace Constructor with Factory Method
    • Right-click and choose Refactor | Replace Constructor with Factory Method on the context menu.
    • Choose ReSharper | Refactor | Convert | Constructor to Factory Method… in the main menu.
    The Replace Constructor with Factory Method dialog will open.
  3. Specify a name for the factory method or accept the suggested name.
  4. By default, the refactoring creates factory method in the same class. If you want to create the factory method in another class, specify the fully qualified name of the class.
  5. To apply the refactoring, click Next.
  6. If no conflicts are found, ReSharper performs the refactoring immediately. Otherwise, it prompts you to resolve conflicts.
Refactorings__Replace_Constructor_with_Factory_Method__dialog_box

This feature is supported in the following languages/technologies:

C# VB.NET C++ HTML ASPX Razor JavaScript TypeScript CSS XML XAML RESX Build Scripts
feature_available feature_available

The instructions and examples given here address the use of the feature in C#. For details specific to other languages, see corresponding topics in the ReSharper by Language section.

See Also

Last modified: 3 September 2015