C#自定义IP输入框控件

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

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

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

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) 
      { 
 
      } 
  } 
} 

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