如何在 C# 中获取 ValueTuple 的第一个元素？
原文:https://www . geeksforgeeks . org/如何获取 c-sharp 中的第一个值元素 tuple/
ValueTuple 是 C# 7.0 中引入的一个结构，代表值类型 Tuple。它允许您存储包含多个值的数据集，这些值可能彼此相关，也可能彼此不相关。 Item1 属性用于获取给定值元组的第一个未命名元素。它适用于每个值元组，如 1 值元组、2 值元组等。
语法:
public T1 Item1;
这里，T1 是 ValueTuple <>结构的字段值。该值元组<>可以是 1 值元组、2 值元组、3 值元组、4 值元组、5 值元组、6 值元组、7 值元组或 8 值元组。
示例:在下面的代码中，可以看到我们正在访问每个值元组的第一个元素。
// C# program to illustrate how to get
// the first element of value tuple
using System;
class GFG {
// Main Method
static public void Main()
{
// Creating a value tuple with one element
var ValTpl1 = ValueTuple.Create("Variables");
Console.WriteLine("C# Topics: ");
// Accessing the first element
// of 1-ValueTuple using the
// Item property
Console.WriteLine(ValTpl1.Item1);
// Creating a value tuple
// with two elements
var ValTpl2 = ValueTuple.Create("Array",
"String");
// Accessing the first element of
// 2-ValueTuple using Item property
Console.WriteLine(ValTpl2.Item1);
// Creating a value tuple
// with three elements
var ValTpl3 = ValueTuple.Create("ArrayList",
"List", "Queue");
// Accessing the first element of
// 3-ValueTuple using Item property
Console.WriteLine(ValTpl3.Item1);
// Creating a value tuple
// with four elements
var ValTpl4 = ValueTuple.Create("Stack", "Dictionary",
"LinkedList", "Interface");
// Accessing the first element of
// 4-ValueTuple using Item property
Console.WriteLine(ValTpl4.Item1);
// Creating a value tuple with five elements
var ValTpl5 = ValueTuple.Create("Identifiers", "Data Types",
"Keywords", "Access Modifiers", "Operators");
// Accessing the first element of
// 5-ValueTuple using Item property
Console.WriteLine(ValTpl5.Item1);
// Creating a value tuple with six elements
var ValTpl6 = ValueTuple.Create("Nullable Types", "Class",
"Structure", "Indexers", "Switch Statement", "Loops");
// Accessing the first element of
// 6-ValueTuple using Item property
Console.WriteLine(ValTpl6.Item1);
// Creating a value tuple with seven elements
var ValTpl7 = ValueTuple.Create("Inheritance ", "Constructors",
"Encapsulation", "Abstraction", "Static Class",
"Partial Classes", "this keyword");
// Accessing the first element of
// 7-ValueTuple using Item property
Console.WriteLine(ValTpl7.Item1);
// Creating a value tuple with eight elements
var ValTpl8 = ValueTuple.Create("Methods", "Method Hiding",
"Optional Parameters", "Anonymous Method",
"Partial Methods", "Local Function", "Delegates",
"Destructors");
// Accessing the first element of
// 8-ValueTuple using Item property
Console.WriteLine(ValTpl8.Item1);
}
}
Output:
C# Topics:
Variables
Array
ArrayList
Stack
Identifiers
Nullable Types
Inheritance
Methods
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