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add topics for tuples to csharp/en

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Added explanation and examples for tuples, deconstruction of tuples and other objects, and discarding unwanted fields during deconstruction
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ksami 2017-10-24 15:20:20 +08:00 committed by GitHub
parent 70c9d58bb1
commit 4eb33f98b4
1 changed files with 55 additions and 15 deletions
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@ -1106,25 +1106,65 @@ namespace Learning.More.CSharp
}
}
//New C# 7 Feature
//Install Microsoft.Net.Compilers Latest from Nuget
//Install System.ValueTuple Latest from Nuget
using System;
namespace Csharp7
{
//New C# 7 Feature
//Install Microsoft.Net.Compilers Latest from Nuget
//Install System.ValueTuple Latest from Nuget
class Program
{
static void Main(string[] args)
{
//Type 1 Declaration
(string FirstName, string LastName) names1 = ("Peter", "Parker");
Console.WriteLine(names1.FirstName);
// TUPLES, DECONSTRUCTION AND DISCARDS
class TuplesTest
{
public (string, string) GetName()
{
// Fields in tuples are by default named Item1, Item2...
var names1 = ("Peter", "Parker");
Console.WriteLine(names1.Item2); // => Parker
//Type 2 Declaration
var names2 = (First:"Peter", Last:"Parker");
Console.WriteLine(names2.Last);
}
}
// Fields can instead be explicitly named
// Type 1 Declaration
(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());
}
}
}
```