C# |颠倒整个列表或指定范围内元素的顺序
原文:https://www . geesforgeks . org/c-sharp-颠倒整个列表或指定范围内元素的顺序/
列表< T >。反转方法用于反转列表<中元素的顺序>或其一部分。列表< T >的过载列表中有两种方法。反向方法如下:
-
反向() *Reverse(Int32, Int32)
反向()方法
此方法用于颠倒整个列表中元素的顺序。
语法:
cs public void Reverse ();以下程序说明了上述方法的使用:
例 1:
```cs // C# Program to reverse the order of // the elements in the entire List using System; using System.Collections; using System.Collections.Generic;
class Geeks {
// Main Method public static void Main() {
// Creating an List of Integers List firstlist = new List();
// Adding elements to List for (int i = 1; i <= 5; i++) { firstlist.Add(i); }
Console.WriteLine("Elements Present in List:");
// Displaying the elements of List foreach(int k in firstlist) { Console.WriteLine(k); }
Console.WriteLine(" ");
Console.WriteLine("After Reversing: ");
// using method Reverse() firstlist.Reverse();
// Displaying the elements of List foreach(int k in firstlist) { Console.WriteLine(k); } } } ```
输出:
```cs Elements Present in List: 1 2 3 4 5
After Reversing: 5 4 3 2 1
```
例 2:
```cs // C# Program to reverse the order of // the elements in the entire List using System; using System.Collections; using System.Collections.Generic;
class Geeks {
// Main Method public static void Main() {
// Creating an List of Integers List firstlist = new List();
// Adding elements to List firstlist.Add("Geeks"); firstlist.Add("C#"); firstlist.Add("Java"); firstlist.Add("C++");
Console.WriteLine("Elements Present in List:");
// Displaying the elements of List foreach(string k in firstlist) { Console.WriteLine(k); }
Console.WriteLine(" ");
Console.WriteLine("After Reversing: ");
// using method Reverse() firstlist.Reverse();
// Displaying the elements of List foreach(string k in firstlist) { Console.WriteLine(k); } } } ```
输出:
```cs Elements Present in List: Geeks C# Java C++
After Reversing: C++ Java C# Geeks
```
反向(Int32，Int32)方法
此方法用于反转指定范围内元素的顺序。
语法:
cs public void Reverse (int index, int count);参数:
指数:是要反转的区间的从零开始的指数。
计数:是范围内要反转的元素个数。
异常:
- argumentoutofrangerexception:如果指数或计数小于零。
- 参数异常:如果索引和计数不表示列表中元素的有效范围< T >。
以下程序说明了上述方法的使用:
例 1:
```cs // C# Program to reverse the order of // sub range in the List using System; using System.Collections; using System.Collections.Generic;
class Geeks {
// Main Method public static void Main() {
// Creating an List of Integers List firstlist = new List();
// Adding elements to List firstlist.Add("1st"); firstlist.Add("2nd"); firstlist.Add("3rd"); firstlist.Add("4th"); firstlist.Add("5th"); firstlist.Add("6th"); firstlist.Add("7th");
Console.WriteLine("Elements Present in List:");
// Displaying the elements of List foreach(string k in firstlist) { Console.WriteLine(k); }
Console.WriteLine(" ");
Console.WriteLine("After Reversing: ");
// Reversing the sub-range // that starts from index 2 // i.e 3rd element, and // count is 4 elements firstlist.Reverse(2, 4);
// Displaying the elements of List foreach(string k in firstlist) { Console.WriteLine(k); } } } ```
输出:
```cs Elements Present in List: 1st 2nd 3rd 4th 5th 6th 7th
After Reversing: 1st 2nd 6th 5th 4th 3rd 7th
```
例 2:
```cs // C# Program to reverse the order of // sub range in the List using System; using System.Collections; using System.Collections.Generic;
class Geeks {
// Main Method public static void Main() {
// Creating an List of Integers List firstlist = new List();
// Adding elements to List firstlist.Add("1st"); firstlist.Add("2nd"); firstlist.Add("3rd"); firstlist.Add("4th"); firstlist.Add("5th"); firstlist.Add("6th"); firstlist.Add("7th");
Console.WriteLine("Elements Present in List:");
// Displaying the elements of List foreach(string k in firstlist) { Console.WriteLine(k); }
Console.WriteLine(" ");
Console.WriteLine("After Reversing: ");
// taking negative index will give error firstlist.Reverse(-1, 4);
// Displaying the elements of List foreach(string k in firstlist) { Console.WriteLine(k); } } } ```
时间错误：
未处理异常: 系统。ArgumentOutOfRangeException:要求非负数。 参数名称:索引
参考:
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