ReSharper 4.5 Released!

ReSharper 4.5 is finally out, so your next productivity upgrade is just a mouse click away!

As announced, the new version features major improvements in performance and memory usage. After all, what is a productivity tool for if not for being agile, robust and responsive?

In addition to focusing on performance enhancements, we also added a number of intelligence features and improvements.

We've prepared a short Flash movie to introduce the new features in ReSharper 4.5. Get the hang of things in just a few minutes!

For users of older versions we have a ReSharper 3.0 vs. ReSharper 4.5 Comparison matrix.

However, if you believe a thousand words say more than a picture does, or even a movie, go ahead and read the descriptions below :)

Alex Morozov, .NET product marketing manager at JetBrains

Performance and Memory Usage Improvements

We have managed to make ReSharper load and work faster and more smoothly in general, particularly on big (and we mean BIG) solutions:

  • Wall-time measurements of solution loading show 20 to 40 percent acceleration until the solution is ready for code editing.
  • Web site loading time has also been reduced by a third.
  • For instance, a certain mixed-language solution consisting of about 15 thousand classes now takes only 70 seconds to load, and this includes making every ReSharper feature available.

The list of significantly accelerated operations includes:

  • renaming symbols
  • finding commonly used symbols
  • creating symbols from usage
  • analyzing large XAML files.

We've also cut down the volume of memory resources required to analyze jumbo autogenerated code files, which should especially benefit those who work with ASP.NET and LINQ to SQL.

Solution-Wide Code Inspections

To enable you to detect unused non-private members on the fly, we have enlisted the help of our ever-improving solution-wide analysis. We have introduced a set of specialized code inspections that only work when you let ReSharper analyze your whole solution. They help you discover:

  • Unused non-private declarations
  • Unused return values of non-private methods
  • Unaccessed non-private fields
  • Unused parameters in non-private members
  • Abstract or virtual events that are never invoked
  • Unassigned fields
  • Members and types that can be made internal instead of public

Look for these inspections in your code and on the Marker Bar, highlighted as warnings or suggestions. In addition, new code annotations are available that you can use to mark certain unused non-private types and members to prevent ReSharper from fussing about them.

VB9 Support

Visual Basic .NET developers can now benefit from VB9 language support that includes implicitly typed local variables, object initializers, anonymous types, extension methods, lambda expressions, partial methods, and embedded XML. VB9 support is all around you, courtesy of new context actions, code completion, refactorings, and Parameter Info, among other supporting features.

Extended Naming Style Configuration

Now you can define custom naming style settings for different languages and symbols including:

  • types
  • namespaces
  • interfaces
  • parameters
  • method properties and events
  • static and instance fields, etc.

For every kind of symbol, you can configure one of five casing options, prefixes and suffixes, variations for different access rights, abbreviations to preserve, or enable naming inspections. As a result, you can precisely align the way ReSharper completes and generates code with your specific coding guidelines.

Other Enhancements
  • Go to Implementation - This new navigation feature lets you jump from usage of a base type or member to any of its end implementations, bypassing intermediate steps in the inheritance chain.
  • New and Improved Refactorings - ReSharper 4.5 has added Inline Field to its family of Inline refactorings. Rename refactoring now provides name completion, and some of the other refactorings were thoroughly refactored themselves, to make them perform faster.
  • Native MSTest Support - Initially available through VstsUnit Plugin and then Gallio, MSTest support has finally made its way to being provided natively in ReSharper, on par with nUnit.
  • Wider Cross-Language Capabilities - Quick-fixes and context actions work better in many cross-language scenarios: for example, you can extend a control written in VB.NET+XAML by choosing "create from usage" right from a C# usage. Add increased coverage for XAML and ASP.NET, and you get a substantial package of improvements.
  • Smoother Language and Framework Support - Following the tradition of ReSharper 4.1, we have improved compatibility with F#, Compact Framework, Silverlight 2, and other languages and tools.

Grab your all-new productivity - download ReSharper 4.5 now at

ReSharper 4.5 is provided as a free upgrade from ReSharper 4.0. If you own an older version, please contact us to check your upgrade availability at ( for US and Canada).

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