Quick Actions let you easily refactor, generate, or otherwise modify code with a single action. Quick Actions are available for C#, C++, and Visual Basic code files. Some actions are specific to a language, and others apply to all languages.
Quick Actions can be used to:
- Apply a code fix for a code analyzer rule violation
- Suppress a code analyzer rule violation
- Apply a refactoring (for example, inline a temporary variable)
- Generate code (for example, introduce a local variable)
Quick Actions can be applied by using the light bulb or screwdriver icons, or by pressing Ctrl+. when your cursor is on a line of code for which an action is available. You'll see an error light bulb if there is a red squiggle indicating an error, and Visual Studio has a fix available for that error.
For any language, third parties can provide custom diagnostics and suggestions, for example as part of an SDK, and Visual Studio light bulbs light up based on those rules.
The icon that appears when a Quick Action is available gives an indication of the type of fix or refactoring that's available. The screwdriver icon indicates just that there are actions available to change the code, but you shouldn't necessarily use them. The yellow light bulb icon indicates there are actions available that you should do to improve your code. The error light bulb icon indicates there's an action available that fixes an error in your code.
To see a light bulb or screwdriver
If a fix is available, light bulbs spontaneously appear when you hover the mouse at the location of an error.
Light bulbs and screwdrivers appear in the left margin of the editor when you move the caret into a line of code for which a Quick Action is available.
Press Ctrl+. anywhere on a line to see a list of available Quick Actions and refactorings.
To see potential fixes
Select either the down arrow next to the light bulb or the Show potential fixes link to display a list of Quick Actions that are available.