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Merge pull request #2949 from ksami/ksami-csharp-tuples

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[csharp/en] Add topics for tuples to csharp/en
This commit is contained in:
Andre Polykanine A.K.A. Menelion Elensúlë
2017-10-27 02:18:07 +03:00
committed by GitHub
parent 4a40fa210a 4eb33f98b4
commit 41ffb9c42f
1 changed files with 55 additions and 15 deletions
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@@ -1154,25 +1154,65 @@ namespace Learning.More.CSharp
} }
} }
//New C# 7 Feature
//Install Microsoft.Net.Compilers Latest from Nuget
//Install System.ValueTuple Latest from Nuget
using System; using System;
namespace Csharp7 namespace Csharp7
{ {
//New C# 7 Feature // TUPLES, DECONSTRUCTION AND DISCARDS
//Install Microsoft.Net.Compilers Latest from Nuget class TuplesTest
//Install System.ValueTuple Latest from Nuget {
class Program public (string, string) GetName()
{ {
static void Main(string[] args) // Fields in tuples are by default named Item1, Item2...
{ var names1 = ("Peter", "Parker");
//Type 1 Declaration Console.WriteLine(names1.Item2); // => Parker
(string FirstName, string LastName) names1 = ("Peter", "Parker");
Console.WriteLine(names1.FirstName);
//Type 2 Declaration // Fields can instead be explicitly named
var names2 = (First:"Peter", Last:"Parker"); // Type 1 Declaration
Console.WriteLine(names2.Last); (string FirstName, string LastName) names2 = ("Peter", "Parker");
}
} // Type 2 Declaration
var names3 = (First:"Peter", Last:"Parker");
Console.WriteLine(names2.FirstName); // => Peter
Console.WriteLine(names3.Last); // => Parker
return names3;
}
public string GetLastName() {
var fullName = GetName();
// Tuples can be deconstructed
(string firstName, string lastName) = fullName;
// Fields in a deconstructed tuple can be discarded by using _
var (_, last) = fullName;
return last;
}
// Any type can be deconstructed in the same way by
// specifying a Deconstruct method
public int randomNumber = 4;
public int anotherRandomNumber = 10;
public void Deconstruct(out int randomNumber, out int anotherRandomNumber)
{
randomNumber = this.randomNumber;
anotherRandomNumber = this.anotherRandomNumber;
}
static void Main(string[] args)
{
var tt = new TuplesTest();
(int num1, int num2) = tt;
Console.WriteLine($"num1: {num1}, num2: {num2}"); // => num1: 4, num2: 10
Console.WriteLine(tt.GetLastName());
}
}
} }
``` ```