C# |删除链接列表开始处的节点

原文:https://www . geeksforgeeks . org/c-sharp-在链接开始时移除节点/T1

链接列表<T1T5。移除首先方法用于移除链表开始处的节点< T >。

语法:

public void RemoveFirst ();

异常:如果链表< T > 为空，该方法抛出 无效操作异常 。

下面给出了一些例子，以便更好地理解实现:

例 1:

// C# code to remove the node at
// the start of the LinkedList
using System;
using System.Collections;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {
        // Creating a LinkedList of Strings
        LinkedList<String> myList = new LinkedList<String>();

        // Adding nodes in LinkedList
        myList.AddLast("A");
        myList.AddLast("B");
        myList.AddLast("C");
        myList.AddLast("D");
        myList.AddLast("E");

        // Displaying the nodes in LinkedList
        Console.WriteLine("The elements in LinkedList are : ");

        foreach(string str in myList)
        {
            Console.WriteLine(str);
        }

        // Removing the node at the start of LinkedList
        myList.RemoveFirst();

        // Displaying the nodes in LinkedList
        Console.WriteLine("The elements in LinkedList are : ");

        foreach(string str in myList)
        {
            Console.WriteLine(str);
        }
    }
}

输出:

The elements in LinkedList are : 
A
B
C
D
E
The elements in LinkedList are : 
B
C
D
E

例 2:

// C# code to remove the node at
// the start of the LinkedList
using System;
using System.Collections;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {
        // Creating a LinkedList of Integers
        LinkedList<int> myList = new LinkedList<int>();

        // Removing the node at the start of LinkedList
        // This should raise "InvalidOperationException"
        // as the LinkedList is empty
        myList.RemoveFirst();

        // Displaying the nodes in LinkedList
        Console.WriteLine("The elements in LinkedList are : ");

        foreach(int i in myList)
        {
            Console.WriteLine(i);
        }
    }
}

运行时错误:

未处理异常: 系统。无效操作异常:链接列表为空。

注:此法为 O(1) 操作。

参考:

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