C#创建用户控件：IPv4地址输入框

对网上的例子做了代码优化。源地址链接：http://blog.sina.com.cn/s/blog_57b5da120100ls8q.html

开发语言：C#

控件名称：IPv4地址输入框

控件样式：


控件属性：

Text：获取或设置string类型的IP地址

Value：获取或设置IPAddress类型的IP地址

Type：获取IP地址所属分类。分A、B、C、D、E 5大类。

BorderStyle：获取或设置控件的边框样式。

源代码：UserControl_IPv4TextBox.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.Net;

namespace IPv4TextBox
{
public enum IPType : byte { A, B, C, D, E };

public class UserControl_IPv4TextBox : UserControl
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.TextBox textBox3;
private System.Windows.Forms.TextBox textBox4;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;

/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region 组件设计器生成的代码

/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
// 通过注册表获取系统默认字体
string DefaultFontFaceName = (string)Microsoft.Win32.Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\GRE_Initialize", "GUIFont.Facename", "SimSun");

this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.textBox3 = new System.Windows.Forms.TextBox();
this.textBox4 = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(0, 3);
this.textBox1.MaxLength = 3;
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(37, 21);
this.textBox1.TabIndex = 0;
this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress);
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(57, 3);
this.textBox2.MaxLength = 3;
this.textBox2.Name = "textBox2";
this.textBox2.Size = new System.Drawing.Size(37, 21);
this.textBox2.TabIndex = 1;
this.textBox2.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
this.textBox2.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress);
//
// textBox3
//
this.textBox3.Location = new System.Drawing.Point(114, 3);
this.textBox3.MaxLength = 3;
this.textBox3.Name = "textBox3";
this.textBox3.Size = new System.Drawing.Size(37, 21);
this.textBox3.TabIndex = 2;
this.textBox3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
this.textBox3.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress);
//
// textBox4
//
this.textBox4.Location = new System.Drawing.Point(171, 3);
this.textBox4.MaxLength = 3;
this.textBox4.Name = "textBox4";
this.textBox4.Size = new System.Drawing.Size(37, 21);
this.textBox4.TabIndex = 3;
this.textBox4.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
this.textBox4.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress);
//
// label1
//
this.label1.AutoSize = true;
this.label1.Font = new System.Drawing.Font(DefaultFontFaceName, 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
this.label1.Location = new System.Drawing.Point(39, 5);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(16, 16);
this.label1.TabIndex = 4;
this.label1.Text = ".";
this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// label2
//
this.label2.AutoSize = true;
this.label2.Font = new System.Drawing.Font(DefaultFontFaceName, 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
this.label2.Location = new System.Drawing.Point(96, 5);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(16, 16);
this.label2.TabIndex = 5;
this.label2.Text = ".";
this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// label3
//
this.label3.AutoSize = true;
this.label3.Font = new System.Drawing.Font(DefaultFontFaceName, 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
this.label3.Location = new System.Drawing.Point(153, 5);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(16, 16);
this.label3.TabIndex = 6;
this.label3.Text = ".";
this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// UserControl_IPv4TextBox
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Controls.Add(this.textBox4);
this.Controls.Add(this.textBox3);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.textBox1);
this.Name = "UserControl_IPv4TextBox";
this.Size = new System.Drawing.Size(212, 30);
this.ResumeLayout(false);
this.PerformLayout();
}

#endregion

public UserControl_IPv4TextBox()
{
InitializeComponent();
}

private void IPv4TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
char KeyChar = e.KeyChar;
int TextLength = ((TextBox)sender).TextLength;

if (KeyChar == '.' || KeyChar == '。' || KeyChar == ' ')
{
if ((((TextBox)sender).SelectedText.Length == 0) && (TextLength > 0) && (((TextBox)sender) != textBox4))
{   // 进入下一个文本框
SendKeys.Send("{Tab}");
}

e.Handled = true;
}

if (Regex.Match(KeyChar.ToString(), "[0-9]").Success)
{
if (TextLength == 2)
{
if (int.Parse(((TextBox)sender).Text + e.KeyChar.ToString()) > 255)
{
e.Handled = true;
}
}
else if (TextLength == 0)
{
if (KeyChar == '0')
{
e.Handled = true;
}
}
}
else
{   // 回删操作
if (KeyChar == '\b')
{
if (TextLength == 0)
{
if (((TextBox)sender) != textBox1)
{   // 回退到上一个文本框 Shift+Tab
SendKeys.Send("+{TAB}{End}");
}
}
}
else
{
e.Handled = true;
}
}
}

/// <summary>
/// string类型的IP地址
/// </summary>
override public string Text
{
get
{
return this.Value.ToString();
}
set
{
IPAddress address;
if (IPAddress.TryParse(value, out address))
{
byte[] bytes = address.GetAddressBytes();
for (int i = 1; i <= 4; i++)
{
this.Controls["textBox" + i.ToString()].Text = bytes[i - 1].ToString("D");
}
}
}
}

/// <summary>
/// IP地址
/// </summary>
public IPAddress Value
{
get
{
IPAddress address;
string ipString = textBox1.Text + "." + textBox2.Text + "." + textBox3.Text + "." + textBox4.Text;

if (IPAddress.TryParse(ipString, out address))
{
return address;
}
else
{
return new IPAddress(0);
}
}
set
{
byte[] bytes = value.GetAddressBytes();
for (int i = 1; i <= 4; i++)
{
this.Controls["textBox" + i.ToString()].Text = bytes[i - 1].ToString("D");
}
}
}

/// <summary>
/// IP地址分类
/// </summary>
public IPType Type
{
get
{
byte[] bytes = this.Value.GetAddressBytes();
int FirstByte = bytes[0];

if (FirstByte < 128)
{
return IPType.A;
}
else if (FirstByte < 192)
{
return IPType.B;
}
else if (FirstByte < 224)
{
return IPType.C;
}
else if (FirstByte < 240)
{
return IPType.D;
}
else
{
return IPType.E;    // 保留做研究用
}
}
}

/// <summary>
/// 控件的边框样式
/// </summary>
new public BorderStyle BorderStyle
{
get
{
return this.textBox1.BorderStyle;
}
set
{
for (int i = 1; i <= 4; i++)
{
((TextBox)this.Controls["textBox" + i.ToString()]).BorderStyle = value;
}
}
}
}
}