C# Present and Future Marita Paletsou Software Engineer

Agenta Brief History C# 5.0 Basic Features.NET Compiler Platform New IDE Experience C# 6.0 New Features

Brief History C# 1.0 VS NET C# 2.0 VS 2005.NET 2.0 C# 3.0 VS NET C# 4.0 VS 2010.NET 4.0 C# 5.0 VS NET 4.5 Generics Static Classes Nullable Types Anonymous Methods LINQ Query & Lamda Expressions Extension Methods TPL DLR Named & Optional Params async + await Caller Info Managed Code

Synchronous vs Asynchronous Synchronous: Execution in a single series Wait one task to finish before move to another Bad User Experience Asynchronous: Run time-consuming operations concurrently Return as soon as an operation is completed Better User Experience

Asynchronous Programming Patterns Asynchronous Programming Model BeginMethodName and EndMethodName Event-based Asynchronous Pattern MethodNameAsync and MethodNameCompleted Task-based Asynchronous Pattern Single method returns Task or Task

async + await Return types: Task void Let compiler do the hard work How does it work?

async void Only for event handlers Caller has no information when async void is completed Caller is unable to catch exceptions from an async void

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Caller Infromation Attributes Debugging, tracing, error handling in runtime Argument types: [CallerMemberName] [CallerFilePath] [CallerLineNumber] Apply to optional parameters

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Opening up VS 2013 Community Edition - Free full featured IDE.NET Server Core “Roslyn” Compiler

New IDE Experience Quick Fixes Renaming Tool Introduce Local Colorization Quick Info Signature Help

C# 6.0 New Features (1) Using Static Classes using System.Console; WriteLine("My message"); Await Calls in catch and finally try { //Do some work } catch (Exception ex) { await Task.Delay(200); } finally { await Task.Delay(200); }; Exception Filters catch (Exception ex) if (ex.Message.Contains("Cannot divide")) Null Conditional Operator member operator: ?. index operator: ?[]

C# 6.0 New Features (2) nameof Expressions throw new ArgumentNullException(nameof(value)); Dictionary Initializers var myDict = new Dictionary () { [1] = "My Name" }; Auto-Property Initializers Only Getter: public Guid guid { get; } = new Guid(); Getter/Setter: public int studentYearOfBirth { get; set; } = 1993; Epression Bodied Properties & Functions public string firstName => string.Format("{0} {1}", firstNm, lastNm); public int age() => DateTime.Now.Year - yearOfBirth;

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Useful Links Visual Studio 2013 Community Edition: Visual Studio 2015 Preview &.NET 4.6 Preview: downloads-vs “Roslyn” Compiler:

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