Writing Better C# Using C# 6 By: Mitchel Sellers

About Your Speaker  Mitchel Sellers  CEO/Director of Development of IowaComputerGurus, Inc  Microsoft C# MVP  DNN MVP  Contact Information    Blog:

Agenda  Quick History of C#  C# 6 Mind Blowing? Or “Just Fluff”?  Feature Listing & Detail

Quick History of C#  C# 1:.NET 1.0  C# 1.2:.NET 1.1  C# 2:.NET 2.0  Generics  C# 3:.NET 3 & 3.5  Auto-Properties  Extension Methods  Anonymous Types  C# 4:.NET 4  Named & Optional Args  C# 5:.NET 4.5  Async!

C# 6 Mind Blowing? Or Just “Fluff”  Compiler as a Service?  What does Rosyln Mean to you?  Hidden features?  Visual Studio Support & Extension Tooling?  Can you use C# 6 features when targeting <.NET 4.6?  What do you use?

using static  Adds an ability to import static classes via a using statement  Simply coding operations when working with math, files, console, etc  Math Example  var result = System.Math.Pow(5, 7); // Old Way  using static System.Math; var result = Pow(5,7);  Intellisense still shows rooting:  Far more powerful with other classes  using static System.Console  using static System.IO.Directory  Can be used with older.NET Runtimes

nameof()  Simply & Standardize reporting of errors & notifications  Better implementation IPropertyChanged  Improved argument reporting  throw new ArgumentException("Oops!", nameof(myValue));  Supports automatic refactoring within the VS tooling  Can be used on older.NET runtimes

String Interpolation  Better way of formatting strings  Old way  String.Format(“Oops {0} isn’t valid”, name);  New way  $”Ooops {name} isn’t valid”  Can use backwards compatible (BUT!!! Only for standard, not the more complex iformattable string)

Null Conditional Operator (?.)  Allows you to short-circuit calls to prevent nexting  Examples  int? nameLength = Person?.Name?.Length  Only executes the next portion in the chain if not null  If person is null returns null & short circuits  If name is null returns null & short circuits  Else returns length  Great for invoking a method  Can be used with prior.NET languages

Expression Bodied Properties & Methods  The ability to inline/create methods & properties with lambdas!  Property Example  public static string MyConfigValue => ConfigurationManager.AppSettings["Test"];  Method Example  public static void LogError(string errorMsg) => Console.WriteLIne(errorMsg);  Can be used with prior runtimes!

Auto Property Initializers & Getters  Lets you set the values as needed when you create properties  Example  public string FirstName { get; set; } = "Mitch";  public string LastName { get; } = “Sellers”;  Can be used on older.NET version

Exception Filters