scalefocus / csharp-features

C# language features, tips, conventions and samples

C# Language Features & Tips

A collection of C# language features and tips samples.

C# release history

Version Release	Date	Tool
1.0	2002	Visual Studio
2.0	2005	Visual Studio 2005
3.0	2008	Visual Studio 2008
4.0	2010	Visual Studio 2010
5.0	2012	Visual Studio 2012
6.0	2015	Visual Studio 2015

C# 6 Language Features

1. Auto-property Enhancements
2. Expression Bodied Methods and Auto-Properties
3. The nameof Expressions
4. Null-conditional Operators
5. String Interpolation
6. Index Initializers
7. Using Static
8. Exception Filters
9. Await in Catch and Finally Blocks
10. Default Constructors in Structs

Abondoned features

Primary Contructors

public class Person(string firstName, string lastName)
{
    public string FirstName { get; set; } = firstName;
    public string LastName { get; set; } = lastName;
}

DeclarationExpressions

// Read number and print the power 2 of the number
if (int.TryParse(var line = Console.ReadLine(), out int i))
{
    Console.WriteLine("Result: {0}", (var x = i) * x, x);
}

// Convert list of strings to list of integers
var strings = new List<string> { "123", "-5", "1337", "3777" };
var numbers = from s in strings select int.TryParse(s, out int i) ? i : -1;

Further readings

https://github.com/dotnet/roslyn/wiki/New-Language-Features-in-C%23-6
Some interesting point of view: http://sietch.net/ViewNewsItem.aspx?NewsItemID=250

C# 7 Features

1. Tuples
2. Pattern matching
3. Record types
4. Non-nullable reference types
5. Local Functions
6. Immutable Types

Full list of features as described in msdn: https://blogs.msdn.microsoft.com/dotnet/2016/08/24/whats-new-in-csharp-7-0/

C# / .Net General discussion suggestions

Threads

• Lock vs Mutex vs Semaphore: When to use & Performance;
• Perhaps also look at System.Threading.Timer;

Performance of abstractions on loops: https://www.infoq.com/articles/For-Each-Performance

Contribute

Check out the contribution guidelines if you want to contribute to this project.

License

Apache-2.0