what's new in c# 6
TRANSCRIPT
WHAT’S NEW IN C# 6
STRING INTERPOLATION
No Interpolation
Concatenation
String.Format
$”Hello {var1}”
C#6.0
$”Value of {price:C2}”
C#6.0
NULL CONDITIONAL OPERATOR
Checking for null
Is a drag
Don’t check
Shortcircuit to null
perhapsNull?.FullName()
C#6.0
USING STATIC
Static methods have to be always
qualified
Enumerable.Empty<T>
using static Enumerable;
C#6.0
Empty<T>
C#6.0
AUTOPROPERTIES INITIZALITION
Getter and Setter declaration
Initialize in the constructor
string Name {get; set;} = “Harry”
C#6.0
GETTER ONLY INITIALIZATION
Getter declaration
Initialize in constructor
string Name {get;} = “Harry”
C#6.0
EXPRESSION BODIES ON METHODS
Methods always need a body
No matter how short
void Method() => expr
C#6.0
EXPRESSION BODIES ON PROPERTIES
Properties always need a body
No matter how short
void Property => expo
C#6.0
NAMEOF EXPRESSIONS
Using hardcoded strings to refer to
expressions
Is error prone
Wrong spelling
Variable changes
nameof(var.FirstName)
C#6.0
EXCEPTION FILTERS
Similar to VB.NET and F#
Exception catch block can have a guard
try {…} catch (Exception e) when (expr) { … }
C#6.0
INDEX INITIALIZER
Simplify dictionary initialization
var numbers = new Dictionary<int, string> { [7] = "seven", [9] = "nine", [13] = "thirteen" };
C#6.0
AWAIT ON CATCH/FINALLY
BLOCKS
Similar to F#
Catch and Finally blocks can have Await
calls
Resource res = null; try { res = await Resource.OpenAsync(…); … } catch(ResourceException e) { await Resource.LogAsync(res, e); } finally { if (res != null) await res.CloseAsync(); }
C#????
PRIMARY CONSTRUCTORS
Simplify constructor declaration
public class Post(long postId, string name, string title){ public long PostID { get; } = postId; public string PostName { get; } = name; public string PostTitle { get; } = title; }
C#????
INDEXED PROPERTY OPERATOR
Simplify Dictionary initialization
dict[“Harry”]
dict.$Harry
C#????
THANK YOU!
The Smartest tool for agile project management
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@abarylko
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Resources
• Github Wiki C# 6 language features: http://bit.ly/Csharp6_features
• MSDN C# 6 features: http://bit.ly/csharp6_msdn
• C# 6.0 in six screenshots: http://bit.ly/csharp_screenshots
Photo Credit
• Under http://creativecommons.org/licenses/by/2.5/
• Jeremy Keith, Roast beef, http://flic.kr/p/TKUz
• Rob Campbell, Field of daisies, http://flic.kr/p/6QJjU4