C# 編寫自訂 IP 輸入框控制項

標籤：c#   ip輸入框   textbox重寫   按鍵事件   

情境: 做一些網路裝置應用時，需要有ip地址的輸入，這就需要ip地址輸入框控制項

思路: 

       1 重寫TextBox 為IpInputBox。

        2 重寫TextBox為SubIpInputBox

        3 一個IpInputBox 添加4個SubIpInputBox 和3個Label

控制項圖：

具體代碼:

主視窗檔案   Dialog.cs

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace IP{    public delegate void FallBackEvent(IpInputBox box, int flag);    public partial class Dialog : Form    {        public Dialog()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            this.Controls.Add(ipBox);            ipBox.Location = new Point(10,10);        }        private IpInputBox ipBox = new IpInputBox(false);    }}

IpInputBox.cs 檔案

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows.Forms;using System.Drawing;namespace IP{    public class IpInputBox :TextBox    {        private bool _isNetmask = false;        public bool IsNetmask        {            get { return _isNetmask; }            set { _isNetmask = value; }        }        public IpInputBox(bool isNetmask)        {            _isNetmask = isNetmask;            this.Size = new System.Drawing.Size(150, 25);            _dotLabel1.Text = ".";            _dotLabel2.Text = ".";            _dotLabel3.Text = ".";            _dotLabel1.Size = new System.Drawing.Size(10, 25);            _dotLabel2.Size = new System.Drawing.Size(10, 25);            _dotLabel3.Size = new System.Drawing.Size(10, 25);            _box1.IsNetmask = _isNetmask;            _box2.IsNetmask = _isNetmask;            _box3.IsNetmask = _isNetmask;            _box4.IsNetmask = _isNetmask;            _box1.Flag = 1;            _box2.Flag = 2;            _box3.Flag = 3;            _box4.Flag = 4;            this.Controls.Add(_box1);            this.Controls.Add(_dotLabel1);            this.Controls.Add(_box2);            this.Controls.Add(_dotLabel2);            this.Controls.Add(_box3);            this.Controls.Add(_dotLabel3);            this.Controls.Add(_box4);            this.Font = new System.Drawing.Font(this.Font.Name, 11);            _box1.Location = new System.Drawing.Point(-1, 2);            _dotLabel1.Location = new System.Drawing.Point(29, 2);            _box2.Location = new System.Drawing.Point(39, 2);            _dotLabel2.Location = new System.Drawing.Point(69, 2);            _box3.Location = new System.Drawing.Point(79, 2);            _dotLabel3.Location = new System.Drawing.Point(109, 2);            _box4.Location = new System.Drawing.Point(119, 2);            _box1.Box = this;            _box2.Box = this;            _box3.Box = this;            _box4.Box = this;        }        public void FallBackEventFun(IpInputBox box, int flag)        {            switch (flag)            {                case 1:                    _box1.Focus();                    break;                case 2:                    _box1.Focus();                    break;                case 3:                    _box2.Focus(); ;                    break;                case 4:                    _box3.Focus(); ;                    break;            }        }        private string _ipAddress = string.Empty;        public void UpDateIpaddress()        {            try            {                string[] sArray = ipAddress.Split(new char[] { '.' });                _box1.Text = sArray[0];                _box2.Text = sArray[1];                _box3.Text = sArray[2];                _box4.Text = sArray[3];            }            catch (Exception exp)            {                MessageBox.Show("更新字串失敗:" + exp.Message);            }        }        /// <summary>        /// 擷取ip地址        /// </summary>        public string IpAddressString        {            get            {                string _ipStr1 = _box1.Text;                string _ipStr2 = _box2.Text;                string _ipStr3 = _box3.Text;                string _ipStr4 = _box4.Text;                string _ipDotStr = ".";                _ipAddress = _ipStr1 + _ipDotStr + _ipStr2 + _ipDotStr + _ipStr3 + _ipDotStr + _ipStr4;                return _ipAddress;            }            set            {                _ipAddress = value;            }        }        private string ipAddress = string.Empty;        public string IpAddress        {            get { return ipAddress; }            set { ipAddress = value; }        }        private SubIpInputBox _box1 = new SubIpInputBox("");        private SubIpInputBox _box2 = new SubIpInputBox("");        private SubIpInputBox _box3 = new SubIpInputBox("");        private SubIpInputBox _box4 = new SubIpInputBox("");        private Label _dotLabel1 = new Label();        private Label _dotLabel2 = new Label();        private Label _dotLabel3 = new Label();    }}

SubIpInputBox.cs 檔案

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Windows.Forms;namespace IP{    public class SubIpInputBox:TextBox    {            /// <summary>            /// 判斷是否是子網路遮罩,false表示ip地址,true表示子網路遮罩            /// </summary>            private bool _isNetmask = false;            private bool _isSendKey = false;            private System.ComponentModel.IContainer components;            private int _flag = 0;            public int Flag            {                get { return _flag; }                set { _flag = value; }            }            /// <summary>            ///             /// </summary>            public event FallBackEvent TextFallBackEvent;            //定義事件函數            public void FallBackEventFun(int flag)            {                if (TextFallBackEvent != null)                {                    TextFallBackEvent(box, this.Flag);                }            }            public bool IsNetmask            {                get { return _isNetmask; }                set { _isNetmask = value; }            }            /// <summary>            /// 建構函式            /// </summary>            public SubIpInputBox(bool isNetmask)            {                _isNetmask = isNetmask;                box = new IpInputBox(_isNetmask);                this.Font = new System.Drawing.Font(this.Font.Name, 11);                this.BorderStyle = System.Windows.Forms.BorderStyle.None;//去掉邊框                this.TextAlign = HorizontalAlignment.Center;//字型置中                this.Size = new System.Drawing.Size(30, 25);                this.MaxLength = 3;            }            public SubIpInputBox(string str)            {                this.Text = str;                this.Size = new System.Drawing.Size(30, 25);                this.MaxLength = 3;                this.BorderStyle = System.Windows.Forms.BorderStyle.None;//去掉邊框                this.TextAlign = HorizontalAlignment.Center;//字型置中            }            private IpInputBox box;            public IpInputBox Box            {                get { return box; }                set { box = value; }            }            protected override void OnKeyUp(KeyEventArgs e)            {                base.OnKeyUp(e);                if (this.Text == "")                {                    if (e.KeyCode.ToString() == "Back")                    {                        this.TextFallBackEvent += new FallBackEvent(box.FallBackEventFun);                        this.FallBackEventFun(this.Flag);                    }                }            }            protected override void OnKeyPress(KeyPressEventArgs e)            {                base.OnKeyPress(e);                //阻止從鍵盤輸入鍵                e.Handled = true;                if ((e.KeyChar >= '0' && e.KeyChar <= '9') || (e.KeyChar == (char)8))                {                    if ((e.KeyChar == (char)8))                    {                        e.Handled = false; return;                    }                    else                    {                        int len = this.Text.Length;                        if (len < 4)                        {                            if (len == 0 && e.KeyChar != '0')                            {                                e.Handled = false; return;                            }                            else if (len == 0)                            {                                if (this.Flag == 1 && this.IsNetmask == false)                                {                                    return;                                }                            }                            e.Handled = false; return;                        }                        else                        {                            // MessageBox.Show("編號最多隻能輸入3位元字！");                        }                    }                }                else if (e.KeyChar == '.')                {                    //MessageBox.Show("編號只能輸入數字！");                    if (this.Text.Length != 0)                    {                        // 如果輸入 . 就執行 TAB 鍵                         SendKeys.SendWait("{TAB}");                    }                }                else if (this._isSendKey)                {                    this.SelectAll();                }            }            protected override void OnTextChanged(EventArgs e)            {                try                {                    string currentStr = this.Text;                    int currentNumber = Convert.ToInt32(currentStr);                    this.Text = currentNumber.ToString();                    this.SelectionStart = currentStr.Length;//設定游標在末尾                    if (_isNetmask == false)//表示ip地址                    {                        if (currentNumber > 223 || (currentNumber == 0 && this.Flag == 1))                        {                            MessageBox.Show("你輸入的" + currentStr + "不是有效數值，請指定一個介於1到223之間的數值!", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Warning);                            if (this.Flag == 1 && currentNumber == 0)                            {                                this.Text = "1";                            }                            else                            {                                this.Text = "223";                            }                            _isSendKey = true;                            this.Focus();                            this.SelectionStart = currentStr.Length;//設定游標在末尾                            this.SelectAll();                        }                        else                        {                            if (currentStr.Length == 3 && _isSendKey == false)                            {// 當輸入的字元個數為3時，跳入另外一個輸入框                                //MessageBox.Show("輸入完畢");                                if (currentNumber == 0)                                {                                    this.Text = "";                                    MessageBox.Show("000");                                }                                SendKeys.SendWait("{TAB}");                            }                        }                    }                    else//子網路遮罩                    {                        if (currentNumber > 255)                        {                            MessageBox.Show("你輸入的" + currentStr + "不是有效數值，請指定一個介於0到255之間的數值!", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Warning);                            this.Text = "255";                            this.Focus();                            this.SelectionStart = currentStr.Length;//設定游標在末尾                            this.SelectAll();                        }                        else                        {                            if (currentStr.Length == 3 && _isSendKey == false)                            {// 當輸入的字元個數為3時，跳入另外一個輸入框                                //MessageBox.Show("輸入完畢");                                SendKeys.SendWait("{TAB}");                            }                        }                    }                }                catch                {                    // 異常處理                }            }            private void InitializeComponent()            {                this.SuspendLayout();                //                 // SubIpInputBox                //                 this.TabIndexChanged += new System.EventHandler(this.SubTextBox_TabIndexChanged);                this.ResumeLayout(false);            }            private void SubTextBox_TabIndexChanged(object sender, EventArgs e)            {            }    }}

C# 編寫自訂 IP 輸入框控制項