C# Changes for the ASP.NET MVC Developer

C# 6 #

Released Jul 20, 2015

Along with Roslyn Compiler, .NET 4.6, and Visual Studio 2015

Summary #

C#6 focuses on streamlining common issues that require clumsy work-arounds that clutter the code.

Null-conditional operator, string interpolation, getter only auto-properties, static using statements, expression-bodied methods, and index initializers all contribute significantly towards increasing readability of C# code, reducing the number of lines and complexity of code, and improving the elegance and ease of expressing the programmer’s intent.

List of Features #

• Null-conditional Operators
  
  int? length = customers?.Length

• String interpolation
  
  var s = $“{p.Name} is {p.Age} year{{s}} old”;

• Getter-only auto-properties and initializers for auto-properties
  
  public string First { get; } = “Jane”;

• Nameof Expressions
  
  if (x == null) throw new ArgumentNullException(nameof(x));

• Static using statements (watch out for extension methods)
  
  using static System.Math;

• Index Initializers for Dictionaries

• Expression-bodied function members i.e. declare a method with =>
  
  public Point Move(int dx, int dy) => new Point(x + dx, y + dy);

• Exception Filters (catch if case is true)

• Await in Catch/Finally blocks

• Can now call an extension method named Add from collection initilializer

• Improved overload resolution

Detailed Explanation of New Features #

GitHub
GitHub Including VB

C# 5 #

Summary #

C# 5 unlocks an entirely new paradigm of programming with the async and await keywords. These keywords enable asynchronous programming (think javascript click handlers) to be written in a synchronous mental model, enabling much cleaner, easier to follow logic lines.

Caller information changes are also significant, and likely to be used heavily by third-party libraries such as Log4Net, and NLog to more accurately and easily determine which methods and line numbers were involved when the trace message was recorded.

List of Changes #

• Async and Await Keywords for asynchronous programming
• Caller Information - Allowing better tracing/debugging tools to be written

Details #

MSDN

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