In this post, would like to provide the new features introduced between major version releases of C# as below:
Version 7.0Released on: March, 2017 Target Framework: 4.6.2 Visual Studio version: 2017
- Out variable: In this improved version, you can now declare out variables in the argument list of a method call, rather than writing a separate
declaration statement above the line and assign an initial value.
if (int.TryParse(input, out var answer))
Console.WriteLine(answer);
else
Console.WriteLine("Could not parse input"); - Tuples and Deconstruction: Tuples are lightweight data structures that contain multiple fields to represent the data members. The fields aren't
validated, and you can't define your own methods. A tuple can be created by assigning a value to each member, and optionally providing semantic names to each
of the members of the tuple.
(string Alpha, string Beta) namedLetters = ("a", "b");
In a tuple assignment, you can also specify the names of the fields on the right-hand side of the assignment as below:
Console.WriteLine($"{namedLetters.Alpha}, {namedLetters.Beta}");var alphabetStart = (Alpha: "a", Beta: "b");
There may be times when you want to unpackage the members of a tuple that were returned from a method. You can do that by declaring separate variables for each of the values in the tuple. This unpackaging is called deconstructing the tuple. It looks as below:
Console.WriteLine($"{alphabetStart.Alpha}, {alphabetStart.Beta}");(int max, int min) = Range(numbers);
Console.WriteLine(max);
Console.WriteLine(min); - Pattern matching
- Local functions
- Expanded expression bodied members
- Ref locals and returns
- Discards
- Binary Literals and Digit Separators
- Throw expressions
Version 6.0Released on: July, 2015 Target Framework: 4.6 Visual Studio version: 2015
- Static imports
- Exception filters
- Auto-property initializers
- Expression bodied members
- Null propagator
- String Interpolation
- nameof operator
- Index initializers
Version 5.0Released on: August, 2012 Target Framework: 4.5 Visual Studio version: 2012 and 2013
- Asynchronous members
- Caller info attributes
Version 4.0Released on: April, 2010 Target Framework: 4.0 Visual Studio version: 2010
- Dynamic binding
- Named/optional arguments
- Generic covariant and contravariant
Version 3.0Released on: November, 2007 Target Framework: 2.0, 3.0 and 3.5 Visual Studio version: 2008 and 2010
- Auto-implemented properties
- Anonymous types
- Query expressions
- Lambda expressions
- Expression trees
- Extension methods
- Implicitly typed variables
- Partial methods
- Object and collection initializers
Version 2.0Released on: November, 2005 Target Framework: 2.0 Visual Studio version: 2005
- Generics
- Partial types
- Anonymous methods
- Nullable types
- Iterators
- Covariance and contravariance
Version 1.0Released on: January, 2002 Target Framework: 1.0 Visual Studio version: 2002
- Classes
- Stucts
- Interfaces
- Events
- Properties
- Delegates
- Expressions
- Statements
- Attributes