C# 编写自定义 IP 输入框控件

2015/01/09 36357

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场景: 做一些网络设备应用时，需要有ip地址的输入，这就需要ip地址输入框控件

思路: 

       1 重写TextBox 为IpInputBox。

        2 重写TextBox为SubIpInputBox

        3 一个IpInputBox 添加4个SubIpInputBox 和3个Label

控件图：

具体代码:

主窗口文件   Dialog.cs

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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 文件
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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("更新字符串失败:" + exp.Message); 
            } 
        } 
   
        /// <summary> 
        /// 获取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 文件
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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> 
            /// 判断是否是子网掩码,false表示ip地址,true表示子网掩码 
            /// </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; 
   
   
            //定义事件函数 
            public void FallBackEventFun(int flag) 
            { 
                if (TextFallBackEvent != null) 
                { 
                    TextFallBackEvent(box, this.Flag); 
                } 
            } 
   
            public bool IsNetmask 
            { 
                get { return _isNetmask; } 
                set { _isNetmask = value; } 
            } 
   
            /// <summary> 
            /// 构造函数 
            /// </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;//去掉边框 
                this.TextAlign = HorizontalAlignment.Center;//字体居中 
                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;//去掉边框 
                this.TextAlign = HorizontalAlignment.Center;//字体居中 
            } 
   
            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); 
   
                //阻止从键盘输入键 
                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("编号最多只能输入3位数字！"); 
                        } 
                    } 
                } 
                else if (e.KeyChar == '.') 
                { 
                    //MessageBox.Show("编号只能输入数字！"); 
                    if (this.Text.Length != 0) 
                    { 
                        // 如果输入 . 就执行 TAB 键  
                        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;//设置光标在末尾 
                    if (_isNetmask == false)//表示ip地址 
                    { 
   
                        if (currentNumber > 223 || (currentNumber == 0 && this.Flag == 1)) 
                        { 
                            MessageBox.Show("你输入的" + currentStr + "不是有效数值，请指定一个介于1到223之间的数值!", "错误", 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;//设置光标在末尾 
                            this.SelectAll(); 
                        } 
                        else 
                        { 
                            if (currentStr.Length == 3 && _isSendKey == false) 
                            {// 当输入的字符个数为3时，跳入另外一个输入框 
                                //MessageBox.Show("输入完毕"); 
                                if (currentNumber == 0) 
                                { 
                                    this.Text = ""; 
                                    MessageBox.Show("000"); 
                                } 
                                SendKeys.SendWait("{TAB}"); 
                            } 
                        } 
   
                    } 
                    else//子网掩码 
                    { 
                        if (currentNumber > 255) 
                        { 
                            MessageBox.Show("你输入的" + currentStr + "不是有效数值，请指定一个介于0到255之间的数值!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning); 
                            this.Text = "255"; 
                            this.Focus(); 
                            this.SelectionStart = currentStr.Length;//设置光标在末尾 
                            this.SelectAll(); 
                        } 
                        else 
                        { 
                            if (currentStr.Length == 3 && _isSendKey == false) 
                            {// 当输入的字符个数为3时，跳入另外一个输入框 
                                //MessageBox.Show("输入完毕"); 
                                SendKeys.SendWait("{TAB}"); 
   
                            } 
                        } 
                    } 
                } 
                catch 
                { 
                    // 异常处理 
                } 
            } 
   
            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) 
            { 
   
            } 
    } 
}

来自：http://blog.csdn.net/taoerit/article/details/42535349