JetBrains Rider
 
2023.1
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  1. Refactorings
  2. Main set of refactorings
  3. Extract Method

Extract Method refactoring

Last modified: 23 May 2023

Refactor | Extract | Extract Method...

Ctrl+R, M

This refactoring allows you to create a new method or a local function based on the selected code fragment. JetBrains Rider analyses the selected statements and detects variables that can be converted into method parameters or represent its return value.

Consider the following example:

Before refactoring

static void PrintReversed(string input)
{
  var chars = input.ToCharArray();
  Array.Reverse(chars);
  var reversed =  new string(chars);
  Console.WriteLine(reversed);
}

After refactoring

static void PrintReversed(string input)
{
  var reversed = ReverseStr(input);
  Console.WriteLine(reversed);
}
private static string ReverseStr(string input)
{
  var chars = input.ToCharArray();
  Array.Reverse(chars);
  var reversed = new string(chars);
  return reversed;
}

tip

The reverse functionality is available with the Inline Method refactoring refactoring.

Extract a method from selected statements

  1. In the editor, select one or more statements that you want to convert into a method.

  2. Do one of the following:

    • Press Ctrl+R, M.

    • Press Alt+Enter and choose Extract Method.

    • Press Ctrl+Shift+R and then choose Extract Method.

    • Choose Refactor | Extract Method from the main menu.

  3. Choose how to extract the selected statements: as a method or as a local function.

  4. If you choose to create a local function, specify where to place the local function inside the current function, and click Next.

    JetBrains Rider. Extract Method refactoring: choosing to extract a local function

  5. Type a name for the new function in the Name field.

  6. Select one of expressions that JetBrains Rider detected as possible function return values in the Return list. There may be other expressions detected as possible return values. They are listed as out parameters.

  7. Include or exclude parameters using the corresponding check boxes in the Parameters area. If you exclude a parameter from the list, the local variable with the same name and type will be created in the method, if necessary.

  8. To change order of parameters, select parameters in the list and use Move Up and Move Up buttons below the parameters list.

  9. If you choose to create a method, select the Make static and/or Make virtual to add the corresponding modifiers to the method.

  10. If you choose to create a method, you can also specify access rights in the Access rights list.

  11. Check the resulted method signature and body in the Preview field.

  12. To apply the refactoring, click Next.

  13. If no conflicts are found, JetBrains Rider performs the refactoring immediately. Otherwise, it prompts you to resolve conflicts.

    tip

    Right after the refactoring has been completed, all changes that it makes anywhere, including other files, are registered as a single operation. So you can use the Undo action Ctrl+Z to roll back all these changes with a single keystroke.

JetBrains Rider. Extract Method refactoring

See also

Procedures