MAXIME LEMAITRE – 26/11/2015

C# 6… meet roslyn …

Agenda

• New features• Bonus• Demo• Conclusion• Question Released July 20, 2015

with .net 4.6, Roslyn, VS 2015

Auto-Property Initializers

You can initialize an auto-implemented property inline. You no longer have to declare a setter, providing a new way to implement an immutable property

auto-implemented properties were introduced in C# 3.0.

Read-Only Auto-Properties

You no longer have to declare a setter for auto-implemented properties. If no setter is declared, the property is immutable everywhere except the type’s constructor

Null-Conditional Operator

If student is null, address will simply be assigned null, and no NullReferenceExeception will occur. This becomes more useful with deeper object graphs.

Using Static Directives

Using static directives are a new kind of using directive which brings static members of types directly into scope.The intention of this feature is to improve code readability by eliminating unnecessary and/or redundant type identifiers

String Interpolation

typically to concatenate strings you would either use the “+” operator or composite formatting with a method such as String.Format

With interpolated string expressions, you have a string with contained expressions that are replaced with the expressions’ results. You have to prefix your string literal with a dollar sign ($)

nameof Expressions

Now with nameof expressions, you don’t have to use string literals and the compiler will be able to warn you if you are using an incorrect name.

Some examples of where nameof expressions may be useful include:• Throwing exceptions during parameter validation• Passing an action name when setting up MVC action links• Needing to pass the name of a property when firing a property changed event in

a class that implements INotifyPropertyChanged• Passing the name of a property when registering a XAML dependency property• Including a variable, type, or member name when logging

Dictionary Initializers

slightly cleaner syntax for dictionary initialization

Expression Bodied Functions and Properties

You can now declare functions and properties as a lambda expression, without the need for a statement block. Intended for simple implementations, the new syntax is more concise in that it eliminates the need for some of the curly braces and the use of an explicit return statement.

Await in Catch and Finally Blocks

Ability to write asynchronous code (use the await keyword) in catch and finally blocks

Exception Filters

Now, through the use of the “when” keyword, we can specify a condition for any catch block. Execution will only drop into a catch block if the condition is satisfied. This allows us to filter exceptions on things other than just the exception type.

Conclusion

C# 6.0 isn’t a radical revolution in C# programming. This version will change the way you write C# code in specific scenarios. But Roslyn add new possibilities in C# 7 is on track…

Bonus : Live code analysis (light bulbs)

The new Roslyn compiler for C# and Visual Basic not only provides faster compile times—it also enables completely new scenarios such as live code analysis, which provide rich and customizable feedback and suggestions directly inside the code editor as you type

Demo

Questions

References

• https://medium.com/@JoeIngeno/c-6-0-features-you-should-know-f8d9056f3330• https://msdn.microsoft.com/en-us/magazine/dn802602.aspx• https://github.com/dotnet/roslyn/wiki/New-Language-Features-in-C%23-6 • https://github.com/dotnet/roslyn/issues/2136 (C# 7 work list of features) • http://stackoverflow.com/questions/27093908/how-to-enable-c-sharp-6-0-feature-in-visual-studio-2013 • https://github.com/dotnet/roslyn • https://www.nuget.org/packages/Microsoft.Net.Compilers/ (standalone compiler via nuget)

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