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);
}
}

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();
}
}

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) {
}
}
}