我要评论场景: 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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