如何在C＃中获取嵌套ValueTuple的元素？

ValueTuple是C＃7.0中引入的结构，表示值类型Tuple。它允许您存储一个数据集，该数据集包含可能彼此相关或不相关的多个值。众所周知， Item 属性用于获取值元组中存在的元素，但是此属性仅适用于七个元素。如果要获取其余元素，则必须使用Rest属性。
Rest属性允许您获取值元组的剩余元素，而不是开始的七个元素。或者您可以说它用于访问嵌套值元组的元素。

句法：

public TRest Rest;

在此，TRest是ValueTuple 结构的字段值。

范例1：

// C# program to illustrate how to get
// the eigth element of value tuple
using System;
  
class GFG {
  
    // Main Method
    static public void Main()
    {
  
        // Creating a value tuple with eight elements
        var ValTpl = ValueTuple.Create("Methods", "Method Hiding",
                        "Optional Parameters", "Anonymous Method",
                              "Partial Methods", "Local Function",
                                      "Delegates", "Destructors");
  
        Console.WriteLine("C# Topics: ");
  
        // Accessing the first element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item1);
  
        // Accessing the second element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item2);
  
        // Accessing the third element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item3);
  
        // Accessing the fourth element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item4);
  
        // Accessing the fifth element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item5);
  
        // Accessing the sixth element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item6);
  
        // Accessing the seventh element of 8-ValueTuple
        // Using Item property
        Console.WriteLine(ValTpl.Item7);
  
        // Accessing the eighth element of 8-ValueTuple
        // Using Rest property
        Console.WriteLine(ValTpl.Rest);
    }
}

输出：

C# Topics: 
Methods
Method Hiding
Optional Parameters
Anonymous Method
Partial Methods
Local Function
Delegates
(Destructors)

范例2：

// C# program to get the
// elements of nested value tuple
using System;
  
class GFG {
  
    // Main method
    static public void Main()
    {
  
        // Creating a nested value tuple
        // Using ValueTuple(T1, T2, T3, T4, T5, T6, T7, 
        // TRest rest) constructor
        var MyValTpl = ValueTuple.Create(23456, "Anu", "CSE", "14-4-1992",
                   27, 2010, 3456781234, ValueTuple.Create("Java", "C#"));
  
        // Accessing the elements of the value tuple
        Console.WriteLine("Employee Details:");
        Console.WriteLine("Id: {0}", MyValTpl.Item1);
        Console.WriteLine("Name: {0}", MyValTpl.Item2);
        Console.WriteLine("Branch: {0}", MyValTpl.Item3);
        Console.WriteLine("DOB: {0}", MyValTpl.Item4);
        Console.WriteLine("Age: {0}", MyValTpl.Item5);
        Console.WriteLine("Passing Year: {0}", MyValTpl.Item6);
        Console.WriteLine("Phone Number: {0}", MyValTpl.Item7);
        Console.WriteLine("Programming Language: {0}", MyValTpl.Rest);
    }
}

输出：

Employee Details:
Id: 23456
Name: Anu
Branch: CSE
DOB: 14-4-1992
Age: 27
Passing Year: 2010
Phone Number: 3456781234
Programming Language: ((Java, C#))