Convert Static to Extension Method refactoring

This refactoring helps you convert a static method to an extension method, provided that the static method:

Has at least one parameter.
Resides in a non-generic, non-nested static class.

Consider the following example:

            
static class Foo
{
  public static string Reverse(string input)
  {
    var chars = input.ToCharArray();
    Array.Reverse(chars);
    return new string(chars);
  }

  static void Test(string str)
  {
    str = Reverse(str);
  }
}

        

            
static class Foo
{
  public static string Reverse(this string input)
  {
    var chars = input.ToCharArray();
    Array.Reverse(chars);
    return new string(chars);
  }

  static void Test(string str)
  {
    str = str.Reverse();
  }
}

        

Convert a static method into an extension method

Place the caret at the declaration or a usage of a static method in the editor, or select it in the File Structure window.
Do one of the following:
- Press Control+Shift+R and then choose Convert Static Method to Extension
- Right-click and choose Refactor | Convert Static Method to Extension in the context menu.
- Choose ReSharper | Refactor | Convert | Static to Extension Method… in the main menu.
If no conflicts are found, ReSharper performs the refactoring immediately. Otherwise, it prompts you to resolve conflicts.

This feature is supported in the following languages and technologies:

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.

Last modified: 21 July 2022