ReSharper extends the default highlighting support of Visual Studio with custom highlighting of code items in different languages. For example, you can easily distinguish between local variables and fields in your code. To switch on ReSharper's highlighting, go to ReSharper | Options | Code Inspection | Settings and select Color Identifiers. The custom color for each item is configurable.
Context actions are code transformations helpers available right in the editor. In contrast to quick-fixes, context actions do not aim to resolve a problem or improve your code, instead, they allow you to quickly introduce minor changes like changing access modifiers, generating a code that checks for null, convert 'foreach' to 'for', etc.
If one or more context actions are available for the current caret position, ReSharper displays the corresponding icon . You can either click the icon or press Alt+Enter, and then select an appropriate action.
ReSharper provides hundreds of context actions in all supported languages. You can enable or disable specific context actions in the ReSharper Options dialog box.
ReSharper complements and extends Visual Studio's native code completion (IntelliSense) with more advanced capabilities. For example, it narrows down the list of suggestions based on your typing, automatically imports selected types and extension methods, adds parentheses when completing method names, suggests variable and field names depending on their types, and so on.
All completion features support CamelHumps — that is, you can complete any item by entering only its uppercase characters.
Ctrl+Space code completion recognizes variables and methods, currently visible type names, keywords, and more. ReSharper automatically suggests prefixes when declaring identifiers, according to your naming style.
ReSharper provides completion for unresolved symbols in local scope: even if a code symbol is not declared, ReSharper grabs its known members from its usages (see screenshot below).
In ASP.NET files, ReSharper also provides code completion for web control properties and events, data sources, content
placeholders, and of course, inline C# code.
When it comes to XAML, you have assistance with references to resources, whereas in build scripts, ReSharper helps you with property, target, task, and attribute names that are available within the current scope.
Ctrl+Space is, however, much more than that. It allows you also to quickly add symbol overrides, partial method bodies and partial classes, implement interface members and generate properties. ReSharper will generate and insert the whole body of method, constructor, property etc. when completing such items.
Smart Code Completion, invoked with Ctrl+Alt+Space, filters the list of methods, fields or variables to match the expected type of an expression.
For example, when you use Smart Completion for method call arguments, the list of suggested values is narrowed down only to the required parameter type. Smart Completion can also suggest creating anonymous methods, lambda expressions, and regular methods, as well as local variables for out parameters.
Smart Completion works like a charm in XAML event handlers and other contexts.
Import Symbol Completion
Import Symbol Completion is invoked with Shift+Alt+Space. Unlike Symbol Completion (which only completes types accessible at the current location), this command displays all types that match a specified prefix regardless of what namespace they belong to, and automatically adds the appropriate namespace import directives when necessary.
In C# code files, Import Symbol Completion works after dot with extension methods and puts necessary using directives. Import Symbol Completion is also very helpful in XAML markup for tag names. Namespace import directives are also inserted as required.
When the completion list is empty or does not contain expected items, you can always press the shortcut for any completion type the second time.
ReSharper will extend the completion list with protected, private and internal members, symbols from non-referenced assemblies, call chains that have return values of the expected data type, casts to the expected data type, and more. Of course, if you use any of the suggestions the missing imports and references are added automatically.
Filters in Code Completion
ReSharper allows you to narrow down completion suggestions by kind of symbol, access modifiers and other filters. You can modify the set of applied filters each time code completion is invoked and/or choose to keep the state of filters.
This feature inserts necessary syntax elements (braces, semicolons etc.) and sets you in position to start the next statement, saving you from excessive juggling with the caret. As you work, keep in mind the default shortcut for this feature: Ctrl+Shift+Enter.
Complete Statement (also known as Smart Enter) comes to rescue in numerous scenarios, including auto-closing parentheses, adding semicolons, completing if, while and for statements, and so on.
For example, whenever you declare a new method, Complete Statement comes in handy after specifying method parameters:
If you press Ctrl+Shift+Enter at this point, ReSharper will automatically insert a closing parenthesis, as well as both braces, and put the caret right where you can proceed with writing the method body:
Regular Expression Assistance
You can choose ReSharper | Tools | Validate Regular Expression in the menu to enter various sample strings and see how your regular expression matches these strings. Using this dialog, you can fix your expression and make sure that you get the expected match.
This part of Visual Studio's IntelliSense is also extended in ReSharper. When you call a method, Parameter Info shows you all available method signatures and parameters with relevant documentation (the tooltip appears automatically while you type, or you can display it by pressing Ctrl+Shift+Space). While you are adding new arguments, ReSharper grays out any signatures that become incompatible.
Highlight Matching Delimiters
In VB.NET, the matching Sub or Function is highlighted when the caret is placed anywhere within or after End Sub or End Function. The matching keyword and its line are highlighted whenever you place the caret within the opening keyword (again, you can fine-tune this feature).
In XML, matching tags are unobtrusively highlighted, letting you see the
If a matching piece of code scrolls off the screen, an appropriate pop-up appears for your convenience.
When a type name cannot be resolved because you forgot to issue the corresponding namespace import directive in the source code, a small pop-up appears to suggest one or more types to import. Simply press Alt+Enter, and the appropriate namespace import directive will be inserted automatically. Also, you will not lose your current caret position.
For markup files in web applications, ReSharper is able to auto-import user controls (ascx files) based on their usages.
Auto-insertion of Delimiters
When you type (, [, ", or ' in the editor, a paired character is inserted
automatically (whenever appropriate). This feature may be easily switched off, but you shouldn't be afraid of
inserting too many closing parentheses, brackets, or quotes by mistake: if the closing parenthesis or quote
already exists, ReSharper will not add the second one.
In XML, as soon as you type an opening quote or bracket, the closing one appears automatically.
ReSharper allows you to quickly change the order of code elements with the press of a key — well, four keys: Ctrl+Shift+Alt+Up/Down/Left/Right. In particular, you can move members up and down, reorder parameters and arguments, move statements within a block, move statements out of or into a block, move XML tags up and down, as well as XML attributes left and right, and so on.
To see the documentation for a certain class, method/function or other symbol right in the editor, position the caret on a code symbol and press Ctrl+Shift+F1. The documentation shows in a pop-up window with clickable links to other resources, most notably MSDN documentation.
Promptly comment or uncomment any block of code by selecting it in the editor and pressing Ctrl+Alt+/ (for line comment) or Ctrl+Shift+/ (for block comments).
You can also use Ctrl+Alt+/ to quickly comment or uncomment the line of code where the caret is located in the editor if no block code has been selected. In the same circumstances, pressing Ctrl+Shift+/ inserts the opening block comment (/*) and the closing block comment (*/) immediately before and immediately after the caret position, or removes them if the caret is positioned inside the commented code block.
Highlight Current Line
You can opt to highlight the line where the caret currently resides with a color. Just select Hightlight current line in the Editor tab of the ReSharper Options dialog box:
You can configure the color of the highlight in the Fonts and Colors tab of the Visual Studio Options dialog box (Tools | Options ).
The Extend Selection feature helps successively select expanding blocks of code. That is, you can easily select any expression in the code by placing the caret somewhere inside it and pressing Ctrl+Alt+Right a few times. Shrink Selection works in the opposite way and can be applied by pressing Ctrl+Alt+Left.
You can also quickly select the member that your caret is on, or even its containing type, by pressing Ctrl+Shift+[.
Duplicate Line or Selection
Quickly duplicate any line (block) of code by placing the caret at this line in the editor (or, respectively, selecting a block) and pressing Ctrl+D.
Split String Literal
When you have to type lengthy string literals, ReSharper helps you split them into several lines by adding the necessary quotation marks and plus characters: while the caret is within a string literal,
press Enter or Shift+Enter to split the string without breaking its value:
Multiple Entries Clipboard
ReSharper provides a special Paste command (Ctrl+Shift+V) that launches the Multiple Entries Clipboard window. It contains references to recent clipboard items with preview, each marked with a figure or letter, which you can easily select between.
Note on shortcuts
All keyboard shortcuts provided in the "Features" section are taken from 'Visual Studio' keyboard scheme. For details on ReSharper's two default keymaps, see Documentation and Demos.