C # Advanced Programming 36-day----tuples

Meta-group

Arrays combine objects of the same type , and tuples combine different types of objects .

. NET 4 defines 8 generic tuple classes and a static tuple class . They are used as a factory for tuples .

A tuple is a data structure that is separated by commas

The tuple<t1,t2,t3...> can be up to 7, or a tuple of eight or more elements can be created through the objects in the nested tuple in the Rest Property Tuple<t1, T2, T3, T4, T5, T6, T7, trest> object.

Case :

tuple of an element

tuple<int> test = new Tuple<int> (34);

two elements of a tuple

tuple<string, int> test2 = new tuple<string, int> ("Zhangsan", 23);

tuple of multiple elements

Tuple<int, int, tuple<int, int>> test_i_i_tii = new Tuple<int, int, tuple<int, int>> (1, 1, new Tup Le<int, Int> (2, 3));

Console.WriteLine (Test. ITEM1);

Console.WriteLine ("{0}: {1}", Test2. Item1,test2. ITEM2);

Console.readkey ();

Multiple return value issues

General shiyongout keywords , using tuples can also be implemented , case :

Using System;

Using System.Collections.Generic;

Using System.Linq;

Using System.Text;

Using System.Threading.Tasks;

namespace meta-group

{

Class Program

{

static void Main (string[] args)

{

String outparam = "";

using the Out keyword to get multiple return values

int returnvalue = Outtest (out outparam);

Console.WriteLine (Outparam);

use Tuple to get multiple keywords

tuple<string, int> test = Tupletest ();

Console.WriteLine ("{0},{1}", Test. ITEM1, Test. ITEM2);;

Console.readkey ();

}

<summary>

implementation returns two values

</summary>

<param name= "Test" ></param>

<returns></returns>

public static int Outtest (out string test)

{

test= "hahaha";

return 10;

}

<summary>

returns two values using a tuple implementation

</summary>

<returns></returns>

public static tuple<string, int> tupletest ()

{

return new tuple<string, int> ("Zhangsan", 10);

}

}

}

Of course, using the same tuple object created by the helper method is simpler :

var test = tuple.create ("Zhangsan", 19); Console.WriteLine ("{0},{1}", Test. Item1,test. ITEM2);

Tuples are typically used in four different ways :

1. Represents a set of data . For example , tuples can represent a database record , and its formation can be a moisturizing record of the various fields .

2. Provides easy access and operation of the data set

3. Without using out parameters ( in C # ) or ByRef parameters in The case of VB , Multiple values are returned from the method rollup

4. Pass multiple values to a method with a single parameter . Case :

static void Main (string[] args)

{

tuple<string,int,char> t=new tuple<string,int,char> ("Zhangsan", +, ' M ')

int res = Test (t);

}

public static int Test (Tuple<string,int,char> t)

{

return 0;

}

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C # Advanced Programming 36-day----tuples