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C#實(shí)現(xiàn)向數(shù)組指定索引位置插入新的元素值

更新時(shí)間：2024年02月07日 10:48:22 作者：wenchm

這篇文章給大家介紹了利用C#實(shí)現(xiàn)向數(shù)組指定索引位置插入新的元素值,首先需要定義一個(gè)一維數(shù)組,然后修改數(shù)組的長度,從而在其中增加一個(gè)元素,需要的朋友可以參考下

一、使用的方法

1.自定義插入方法

首先需要定義一個(gè)一維數(shù)組，然后修改數(shù)組的長度(這里使用Length屬性獲取數(shù)組的長度，然后加1，作為新數(shù)組的長度)，從而在其中增加一個(gè)元素。只有增加了數(shù)組的長度以后才能在這個(gè)數(shù)組中增加新的元素。

2.使用List<T>.Add(T) 方法

首先，創(chuàng)建一個(gè)與原始數(shù)組大小相同的動(dòng)態(tài)數(shù)組（例如，List<T>）。然后，將原始數(shù)組的元素復(fù)制到動(dòng)態(tài)數(shù)組中，直到到達(dá)要插入元素的索引位置。在動(dòng)態(tài)數(shù)組中插入新元素。將原始數(shù)組中剩余的元素復(fù)制到動(dòng)態(tài)數(shù)組中。最后，將動(dòng)態(tài)數(shù)組轉(zhuǎn)換回?cái)?shù)組并返回。

二、實(shí)例

1.示例1：List<T>.Add(T) 方法

// 將一個(gè)元素插入到現(xiàn)有數(shù)組的指定索引位置，
// 并將原來位于該位置的元素向后移動(dòng)
 
namespace _095_1
{
    class Program
    {
        static void Main(string[] args)
        {
            ArgumentNullException.ThrowIfNull(args);
 
            int[] originalArray = [1, 2, 3, 4, 5];
            int elementToInsert = 10;
            int indexToInsert = 2;
 
            int[] newArray = InsertElement(originalArray, elementToInsert, indexToInsert);
 
            Console.WriteLine(string.Join(", ", newArray));
        }
 
        static int[] InsertElement(int[] originalArray, int elementToInsert, int indexToInsert)
        {
            List<int> dynamicArray = new(originalArray.Length);
 
            // Copy elements from original array to dynamic array until the insertion index
            for (int i = 0; i < indexToInsert; i++)
            {
                dynamicArray.Add(originalArray[i]);
            }
 
            // Insert the element at the specified index
            dynamicArray.Add(elementToInsert);
 
            // Copy remaining elements from original array to dynamic array
            for (int i = indexToInsert; i < originalArray.Length; i++)
            {
                dynamicArray.Add(originalArray[i]);
            }
 
            // Convert dynamic array to a new array and return
            return [.. dynamicArray];
        }
    }
}
//運(yùn)行結(jié)果：
/*
1, 2, 10, 3, 4, 5
 */

2.示例：自定義插入方法

//在既有數(shù)組中的指定位置插入一個(gè)新的元素，
//并遍歷輸出新數(shù)組
namespace _095
{
    public partial class Form1 : Form
    {
        private Button? button1;
        private Button? button2;
        private Label? label1;
        private Label? label2;
        private TextBox? textBox1;
        private TextBox? textBox2;
        private RichTextBox? richTextBox1;
        private Label? label3;
        private TextBox? textBox3;
        private int[] int_array = new int[8];
 
        public Form1()
        {
            InitializeComponent();
            StartPosition = FormStartPosition.CenterScreen;
            Load += Form1_Load;
        }
 
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(12, 9),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 0,
                Text = "生成數(shù)組",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // button2
            // 
            button2 = new Button
            {
                Location = new Point(224, 36),
                Name = "button2",
                Size = new Size(43, 23),
                TabIndex = 1,
                Text = "確定",
                UseVisualStyleBackColor = true
            };            
            button2.Click += Button2_Click;
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(12, 42),
                Name = "label1",
                Size = new Size(56, 17),
                TabIndex = 2,
                Text = "插入索引"
            };
            // 
            // label2
            // 
            label2 = new Label
            {
                AutoSize = true,
                Location = new Point(12, 69),
                Name = "label2",
                Size = new Size(56, 17),
                TabIndex = 3,
                Text = "新數(shù)組："
            };
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(93, 9),
                Name = "textBox1",
                Size = new Size(174, 23),
                TabIndex = 4
            };
            // 
            // textBox2
            // 
            textBox2 = new TextBox
            {
                Location = new Point(73, 36),
                Name = "textBox2",
                Size = new Size(40, 23),
                TabIndex = 5
            };          
            // 
            // richTextBox1
            // 
            richTextBox1 = new RichTextBox
            {
                Location = new Point(12, 90),
                Name = "richTextBox1",
                Size = new Size(254, 44),
                TabIndex = 6,
                Text = ""
            };
            // 
            // label3
            // 
            label3 = new Label
            {
                AutoSize = true,
                Location = new Point(118, 42),
                Name = "label3",
                Size = new Size(56, 17),
                TabIndex = 7,
                Text = "插入元素"
            };
            // 
            // textBox3
            // 
            textBox3 = new TextBox
            {
                Location = new Point(179, 36),
                Name = "textBox3",
                Size = new Size(40, 23),
                TabIndex = 8
            };
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(279, 146);
            Controls.Add(textBox3);
            Controls.Add(label3);
            Controls.Add(richTextBox1);
            Controls.Add(textBox2);
            Controls.Add(textBox1);
            Controls.Add(label2);
            Controls.Add(label1);
            Controls.Add(button2);
            Controls.Add(button1);
            Name = "Form1";
            Text = "在數(shù)組中添加一個(gè)元素";
 
        }
        /// <summary>
        /// 生成數(shù)組事件
        /// 遍歷生成整形數(shù)組，并遍歷輸出
        /// </summary>
        private void Button1_Click(object? sender, EventArgs e)
        {
            textBox1!.Clear();
            for (int i = 0; i < int_array.GetUpperBound(0) + 1; i++)
            {
                int_array[i] = i;
            }
            for (int i = 0; i < int_array.GetUpperBound(0) + 1; i++)
            {
                textBox1.Text += int_array[i] + " ";
            }
        }
        /// <summary>
        /// 確定插入事件
        /// 在生成的數(shù)組索引=4的位置插入一個(gè)元素，并遍歷輸出
        /// 這個(gè)事件不僅調(diào)用AddArray方法，更是在調(diào)用該方法之后改變了數(shù)組的大小
        /// </summary>
        private void Button2_Click(object? sender, EventArgs e)
        {
            richTextBox1!.Clear();
            if ((textBox2!.Text != "")&& (textBox3!.Text !="")&& (textBox3!.Text.Length == 1))
            {
                int_array = AddArray(int_array, Convert.ToInt32(textBox2!.Text), Convert.ToInt32(textBox3!.Text));
 
                for (int i = 0; i < int_array.GetUpperBound(0) + 1; i++)
                {
                    richTextBox1.Text += int_array[i] + " ";
                }
            }
            else
            {
                MessageBox.Show("輸入信息不能為空且元素長度恒為1", "提示");
            }
        }
 
        /// <summary>
        /// 向數(shù)組中插入單個(gè)元素的方法
        /// </summary>
        /// <param name="ArrayBorn">要向其中添加元素的一維數(shù)組</param>
        /// <param name="Index">添加索引</param>
        /// <param name="Value">添加值</param>
        /// <returns></returns>
        static int[] AddArray(int[] ArrayBorn, int Index, int Value)
        {
            if (Index >= ArrayBorn.Length)
                Index = ArrayBorn.Length - 1;
            int[] TemArray = new int[ArrayBorn.Length + 1];//聲明一個(gè)新的數(shù)組
            for (int i = 0; i < TemArray.Length; i++)
            {
                if (Index >= 0)
                {
                    if (i < (Index + 1))        //判斷遍歷到的索引是否小于添加索引加1
                        TemArray[i] = ArrayBorn[i];
                    else if (i == (Index + 1))//判斷遍歷到的索引是否等于添加索引加1
                        TemArray[i] = Value;
                    else
                        TemArray[i] = ArrayBorn[i - 1];
                }
                else
                {
                    if (i == 0)//數(shù)組首位置
                        TemArray[i] = Value;
                    else
                        TemArray[i] = ArrayBorn[i - 1];
                }
            }
            return TemArray;
        }
    }
}