C#实现的IP地址输入框类 kewords: IP地址框 C# .Net

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

namespace System.IPCtrl
{
 /// <summary>
 /// IP地址输入控件 written by haipeng
 /// </summary>
 
 /// <summary>
 /// 表示IP地址的类型为A、B、C或D类地址
 /// </summary>
 public enum IPType:byte{A,B,C,D};
 public class IPbox : System.Windows.Forms.UserControl
 {
  private System.Windows.Forms.TextBox txt1;
  private System.Windows.Forms.TextBox txt2;
  private System.Windows.Forms.TextBox txt3;
  private System.Windows.Forms.TextBox txt4;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.Label label4;
  /// <summary>
  /// Required designer variable.
  /// </summary>
  private System.ComponentModel.Container components = null;

  public IPbox()
  {
   // This call is required by the Windows.Forms Form Designer.
   InitializeComponent();

   // TODO: Add any initialization after the InitComponent call

  }

  /// <summary>
  /// Clean up any resources being used.
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if( components != null )
     components.Dispose();
   }
   base.Dispose( disposing );
  }

  #region Component Designer generated code
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {
   this.txt1 = new System.Windows.Forms.TextBox();
   this.txt2 = new System.Windows.Forms.TextBox();
   this.txt3 = new System.Windows.Forms.TextBox();
   this.txt4 = 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.label4 = new System.Windows.Forms.Label();
   this.SuspendLayout();
   //
   // txt1
   //
   this.txt1.BorderStyle = System.Windows.Forms.BorderStyle.None;
   this.txt1.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.txt1.Location = new System.Drawing.Point(2, 2);
   this.txt1.MaxLength = 3;
   this.txt1.Name = "txt1";
   this.txt1.Size = new System.Drawing.Size(24, 16);
   this.txt1.TabIndex = 0;
   this.txt1.Text = "";
   this.txt1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
   this.txt1.LostFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt1.GotFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txt1_KeyPress);
   //
   // txt2
   //
   this.txt2.BorderStyle = System.Windows.Forms.BorderStyle.None;
   this.txt2.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.txt2.Location = new System.Drawing.Point(34, 2);
   this.txt2.MaxLength = 3;
   this.txt2.Name = "txt2";
   this.txt2.Size = new System.Drawing.Size(24, 16);
   this.txt2.TabIndex = 1;
   this.txt2.Text = "";
   this.txt2.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
   this.txt2.LostFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt2.GotFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt2.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txt2_KeyPress);
   //
   // txt3
   //
   this.txt3.BorderStyle = System.Windows.Forms.BorderStyle.None;
   this.txt3.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.txt3.Location = new System.Drawing.Point(66, 2);
   this.txt3.MaxLength = 3;
   this.txt3.Name = "txt3";
   this.txt3.Size = new System.Drawing.Size(24, 16);
   this.txt3.TabIndex = 2;
   this.txt3.Text = "";
   this.txt3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
   this.txt3.LostFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt3.GotFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt3.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txt3_KeyPress);
   //
   // txt4
   //
   this.txt4.BorderStyle = System.Windows.Forms.BorderStyle.None;
   this.txt4.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.txt4.Location = new System.Drawing.Point(98, 2);
   this.txt4.MaxLength = 3;
   this.txt4.Name = "txt4";
   this.txt4.Size = new System.Drawing.Size(24, 16);
   this.txt4.TabIndex = 3;
   this.txt4.Text = "";
   this.txt4.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
   this.txt4.LostFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt4.GotFocus += new System.EventHandler(this.txt_LostFocus);
   this.txt4.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txt4_KeyPress);
   //
   // label1
   //
   this.label1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
   this.label1.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.label1.Location = new System.Drawing.Point(26, 2);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(8, 16);
   this.label1.TabIndex = 7;
   this.label1.Text = ".";
   this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
   //
   // label2
   //
   this.label2.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
   this.label2.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.label2.Location = new System.Drawing.Point(90, 2);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(8, 16);
   this.label2.TabIndex = 8;
   this.label2.Text = ".";
   this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
   //
   // label3
   //
   this.label3.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
   this.label3.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
   this.label3.Location = new System.Drawing.Point(58, 2);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(8, 16);
   this.label3.TabIndex = 9;
   this.label3.Text = ".";
   this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
   //
   // label4
   //
   this.label4.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
   this.label4.Font = new System.Drawing.Font("SimSun", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
   this.label4.Location = new System.Drawing.Point(0, 0);
   this.label4.Name = "label4";
   this.label4.Size = new System.Drawing.Size(122, 18);
   this.label4.TabIndex = 10;
   //
   // IPbox
   //
   this.Controls.Add(this.label3);
   this.Controls.Add(this.label2);
   this.Controls.Add(this.label1);
   this.Controls.Add(this.txt4);
   this.Controls.Add(this.txt3);
   this.Controls.Add(this.txt2);
   this.Controls.Add(this.txt1);
   this.Controls.Add(this.label4);
   this.Name = "IPbox";
   this.Size = new System.Drawing.Size(124, 20);
   this.Load += new System.EventHandler(this.UserControl1_Load);
   this.ResumeLayout(false);

  }
  #endregion

  private void UserControl1_Load(object sender, System.EventArgs e)
  {
  
  }

  public void Clear()
  {
   this.txt1.Text="";
   this.txt2.Text="";
   this.txt3.Text="";
   this.txt4.Text="";
  }

  private void txt1_KeyPress(object sender, KeyPressEventArgs e)
  {
   try
   {
    string str=e.KeyChar.ToString();
    if(e.KeyChar.ToString()=="." || e.KeyChar.ToString()=="。"||e.KeyChar.ToString()==" ")
    {
     if (txt1.SelectedText.ToString()=="" && txt1.Text.ToString()!="")
     {
      SendKeys.Send("{Tab}");
    
     
     }
     e.Handled=true;
     return;
    }

    if (Regex.Match(e.KeyChar.ToString(),"[0-9]").Success)
    {
     if (txt1.Text.Length==2)
     {
      if(int.Parse(txt1.Text.ToString()+e.KeyChar.ToString())>255)
      {
       e.Handled=true;
      }
      else
      {
       txt2.Focus();
      }
     
     }
    
    }
    else
    {

     if(e.KeyChar.ToString()=="\b")
     {
     }
     else
     {                      
      e.Handled=true;
     }
    }
   }
   catch
   {
    e.Handled=true;
   }

  }
  private void txt2_KeyPress(object sender, KeyPressEventArgs e)
  {
   try
   {
    if(e.KeyChar.ToString()=="." || e.KeyChar.ToString()=="。"||e.KeyChar.ToString()==" ")
    {
     if (txt2.SelectedText.ToString()=="" && txt2.Text.ToString()!="")
     {
      SendKeys.Send("{Tab}");
     
     
     }
     e.Handled=true;return;
    }

    if (Regex.Match(e.KeyChar.ToString(),"[0-9]").Success)
    {
     if (txt2.Text.Length==2)
     {
      if(int.Parse(txt2.Text.ToString()+e.KeyChar.ToString())>255)
      {
       e.Handled=true;
      }
      else
      {
       txt3.Focus();
      }
     }
    
    }
    else
    {

     if(e.KeyChar.ToString()=="\b")
     {
      if(txt2.Text.ToString()=="")
      {
       txt1.Focus();
       SendKeys.Send("{End}");
      }
     }
     else
     {                      
      e.Handled=true;
     }
    }
   }
   catch
   {
    e.Handled=true;
   }

  }
  private void txt3_KeyPress(object sender, KeyPressEventArgs e)
  {
   try
   {

    if(e.KeyChar.ToString()=="." || e.KeyChar.ToString()=="。"||e.KeyChar.ToString()==" ")
    {
     if (txt3.SelectedText.ToString()=="" && txt3.Text.ToString()!="")
     {
      SendKeys.Send("{Tab}");
     
     
     }
     e.Handled=true;return;

    }

    if (Regex.Match(e.KeyChar.ToString(),"[0-9]").Success)
    {
     if (txt3.Text.Length==2)
     {
      if(int.Parse(txt3.Text.ToString()+e.KeyChar.ToString())>255)
      {
       e.Handled=true;
      }
      else
      {
       txt4.Focus();
      }
     }
    
    }
    else
    {

     if(e.KeyChar.ToString()=="\b")
     {
      if(txt3.Text.ToString()=="")
      {
       txt2.Focus();
       SendKeys.Send("{End}");
      }
     }
     else
     {                      
      e.Handled=true;
     }
    }
   }
   catch
   {
    e.Handled=true;
   }

  

  }
  private void txt4_KeyPress(object sender, KeyPressEventArgs e)
  {
   try
   {

    if(e.KeyChar.ToString()=="." || e.KeyChar.ToString()=="。"||e.KeyChar.ToString()==" ")
    {
    
     e.Handled=true;
    
    }

    if (Regex.Match(e.KeyChar.ToString(),"[0-9]").Success)
    {
     if (txt4.Text.Length==2)
     {
      if(int.Parse(txt4.Text.ToString()+e.KeyChar.ToString())>255)
      {
       e.Handled=true;
      }

     }
    
    }
    else
    {

     if(e.KeyChar.ToString()=="\b")
     {
      if(txt4.Text.ToString()=="")
      {
       txt3.Focus();
       SendKeys.Send("{End}");
      }
     }
     else
     {                      
      e.Handled=true;
     }
    }
   }
   catch
   {
    e.Handled=true;
   }

  

  }

  private void txt_LostFocus(object sender, EventArgs e)
  {
   while(txt1.Text.Length>1 && txt1.Text.ToString().Substring(0,1)=="0")
   {
    txt1.Text=txt1.Text.ToString().Remove(0,1);
   }
   while(txt2.Text.Length>1 && txt2.Text.ToString().Substring(0,1)=="0")
   {
    txt2.Text=txt2.Text.ToString().Remove(0,1);
   }
   while(txt3.Text.Length>1 && txt3.Text.ToString().Substring(0,1)=="0")
   {
    txt3.Text=txt3.Text.ToString().Remove(0,1);
   }
   while(txt4.Text.Length>1 && txt4.Text.ToString().Substring(0,1)=="0")
   {
    txt4.Text=txt4.Text.ToString().Remove(0,1);
   }

  }

  /// <summary>
  /// 返回string类型的用户在IPBox控件中输入的IP地址
  /// </summary>
  override public string Text
  {
   get
   {
    return txt1.Text.ToString().Trim()+"."+txt2.Text.ToString().Trim()+"."+txt3.Text.ToString().Trim()+"."+txt4.Text.ToString().Trim();
   }
   set
   {
    try
    {
     string[] str=new string[4];
     str=value.Split(char.Parse("."));
     for(int i=0;i<4;i++)
     {
      if(int.Parse(str[i])>-1 && int.Parse(str[i])<256)
      {
       txt1.Text=str[0];
       txt2.Text=str[1];
       txt3.Text=str[2];
       txt4.Text=str[3];
      }
     }
    }
    catch
    {
    }
   }
   
  }
  /// <summary>
  /// 返回System.Net.IPAddress类型的IP地址
  /// </summary>
  public IPAddress IPaddress
  {
   get
   {
    try
    {
     return IPAddress.Parse(this.Text.ToString());
    }
    catch
    {
     return IPAddress.Parse("0.0.0.0");
    }
   }
  }
  /// <summary>
  /// 返回IP地址的类型（A,B,C,D），返回值为IPType类型
  /// </summary>

  public IPType Type
  {
   get
   {
    if (int.Parse(this.txt1.Text.ToString().Trim())<128)
    {
     return IPType.A;
    }
    else
    {
     if (int.Parse(this.txt1.Text.ToString().Trim())<192)
     {
      return IPType.B;
     }
     else
     {
      if(int.Parse(this.txt1.Text.ToString().Trim())<224)
      {
       return IPType.C;
      }
      else
      {
       return IPType.D;
      }
     }
    }
   }
  }

  public BorderStyle BorderStyle
  {
   get
   {
    return this.label4.BorderStyle;
   }
   set
   {
    try
    {
     this.label4.BorderStyle=value;
    }
    catch
    {
    }
   }
  }

  
 }
}