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Introduce Variable refactoring

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ReSharper_IntroVariable

This refactoring allows you to create a new local variable or constant based on a selected expression, initialize it with the expression, and finally replace all occurrences of the expression in the method with references to the newly introduced variable.

In the example below, we use this refactoring to replace two occurrences of the same string with a variable:

Before refactoringAfter refactoring
static void LogError(Exception ex) { Console.WriteLine("Something has failed..."); File.WriteAllText(@"c:\Error.txt", "Something has failed..." + ex); }
static void LogError(Exception ex) { var message = "Something has failed..."; Console.WriteLine(message); File.WriteAllText(@"c:\Error.txt", message + ex); }

To replace one or more occurrences of an expression with a variable

  1. Select an expression in the editor.
  2. ReSharper adds the new local variable and suggests to choose its type and name. You can choose one of the suggestions or type your own values. Press Tab or Enter to move to the next input position. Shift+Tab to return to the previous input position.

This feature is supported in the following languages and technologies:

Language: C# Language: VB.NET Language: C++ Language: HTML Language: ASP.NET Language: Razor Language: JavaScript Language: TypeScript Language: CSS Language: XML Language: XAML Language: Resx Language: Build Scripts Language: Protobuf Language: JSON
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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: 22 February 2018

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