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THE FUTURE OF C# KEVIN PILCH-BISSON kevinpi@microsoft.com MADS TORGERSEN mads.torgersen@microsoft.com
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PROJECT ROSLYN A reimplementation of C# and VB compilers In C# and VB With rich public APIs On CodePlex
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WHY ROSLYN?
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ROSLYN DEMO Rich IDE experiences Custom diagnostics New language features
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RICH IDE EXPERIENCES Inline Rename with conflict detection More refactorings: Introduce local Inline temp Lightbulbs to quickly fix up your code Small improvements throughout: Colorization in quick info, signature help, outlining tooltips Smarter case matching in Completion
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CUSTOM DIAGNOSTICS Easily detect common coding problems Run live in the IDE Can attach “quick fixes” to them as well Run as part of command line/team builds Distribute together with a library on NuGet
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LANGUAGE FEATURES Using static members using System.Console; … Write(4); Primary Constructors class Point(int x, int y) { … } Auto-property Initializers public int X { get; set; } = x; Getter-only auto-properties public int Y { get; } = y; Index initializers new JObject { ["x"] = 3, ["y"] = 4 } Declaration Expressions int.TryParse(s, out var x); Await in catch/finally try { … } catch { await … } finally { await … } Exception Filters catch (E e) if (e.Count == 0) { } Null Propagation Operator customer?.Orders?[5].Price
![LANGUAGE FEATURES Using static members using System.Console; … Write(4); Primary Constructors class Point(int x, int y) { … } Auto-property Initializers public int X { get; set; } = x; Getter-only auto-properties public int Y { get; } = y; Index initializers new JObject { [ x ] = 3, [ y ] = 4 } Declaration Expressions int.TryParse(s, out var x); Await in catch/finally try { … } catch { await … } finally { await … } Exception Filters catch (E e) if (e.Count == 0) { } Null Propagation Operator customer .Orders [5].Price](http://images.slideplayer.com/14/4485696/slides/slide_7.jpg "LANGUAGE FEATURES Using static members using System.Console; … Write(4); Primary Constructors class Point(int x, int y) { … } Auto-property Initializers public int X { get; set; } = x; Getter-only auto-properties public int Y { get; } = y; Index initializers new JObject { [ x ] = 3, [ y ] = 4 } Declaration Expressions int.TryParse(s, out var x); Await in catch/finally try { … } catch { await … } finally { await … } Exception Filters catch (E e) if (e.Count == 0) { } Null Propagation Operator customer .Orders [5].Price")
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CALL TO ACTION Use the IDE and language features Dip your toes in custom diagnostics Consider forking the compiler source Give us feedback
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ROSLYN, C# AND VB RESOURCES
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