Code analysis

ReSharper provides static code analysis (also known as code inspection) by applying over 2500 code inspections in C#, VB.NET, XAML, XML, ASP.NET, ASP.NET MVC, Razor, JavaScript, TypeScript, HTML, CSS, ResX, and build script code, detecting compiler and runtime errors, suggesting corrections and improvements before you even compile.

By default, ReSharper starts analyzing a code file as soon as you open it in the editor, all the way you edit it, until it is closed. This design time inspection is performed silently by continuously applying all code inspections to your code. Not only ReSharper highlights code issues right in the editor according to their severity levels, it also adds its own marker bar to the right of the editor window, where you can see instantly the status of the file and jump to specific code issues, and provides commands for navigation between code issues.

If necessary, you can run code inspection for a specific project or the entire solution and check the list of issues found in the specified scope.

Also, you can enable the Solution-wide analysis that will detect all errors in your entire solution and extend the list of code inspections in the current file (for example it will find unused public members).

If needed, you can use code annotations to customize the way ReSharper inspects your code.

Another good thing is that you can define you own custom code inspections based on structural search and replace patterns, and specify severity level for them.

ReSharper helps you resolve most of the discovered code issues automatically. All you need is to press AltEnter when the caret is on a code issue highlighted in the editor and check the suggested quick-fixes.

ReSharper also provides features that do not detect code issues automatically, but rather allow you to find potential problems yourself by deeper investigation of the code. For instance, you can study call chains and find origin and destinations of a specific value. For more information about these features, refer to the Code exploration section.

ReSharper allows you to visually study how types depend on each other in your solution. You can add any number of types from different projects or compiled assemblies to the type dependency diagram and study different kinds of dependencies between them. For more information, refer to Explore type dependency diagram

Some code issues may be discovered by analyzing the solution architecture. ReSharper can help you here with the project dependency analysis that allows you to visually explore project dependency diagram, find and optimize unused references, and detect possible architecture problems.

If you need to integrate automatic code quality analysis into your CI, version control or any other server, you can use InspectCode Command-Line Tool which is free of charge and does not require ReSharper or Visual Studio to be running.

Most of ReSharper's code analysis features are available in C# and Visual Basic, some are available in several languages, others are language-specific. The table below lists all code analysis features and languages/technologies where they are supported.

The instructions and examples given in the topics within this section address the use of code analysis features in C#. For more information about code analysis features available for specific languages, refer to the corresponding topics in the Languages and frameworks section.