WinForm IP地址输入框控件实现

本文实例为大家分享了winform ip地址输入框控件的具体实现代码，供大家参考，具体内容如下

ipinput.cs

using system;
using system.collections.generic;
using system.componentmodel;
using system.drawing;
using system.data;
using system.text;
using system.windows.forms;
using system.text.regularexpressions;

namespace ipinputcontrol.ctrl
{
 public partial class ipinput : usercontrol
 {
 public ipinput()
 {
  initializecomponent();
 }
 textbox parenttxt;
 private void ipinput_load(object sender, eventargs e)
 {
  parenttxt = txt_1;
 }
 public void txt_keydown(object sender, keyeventargs e)
 {
  parenttxt = (textbox)sender;
  if (e.keycode == keys.left)
  {
  switch (parenttxt.name.split('_')[1])
  {
   case "1":
   break;
   case "2":
   if (parenttxt.selectionstart == 0 && parenttxt.text != "")
   {
    if (int.parse(parenttxt.text) > 255)
    {
    messagebox.show(parenttxt.text + "不是有效项。请指定一个介于1和255之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    parenttxt.text = "255";
    parenttxt.selectionstart = 0;
    }
    else
    {
    txt_1.focus();
    }
   }
   else if (parenttxt.text == "")
   {
    txt_1.focus();
   }
   break;
   case "3":
   if (parenttxt.selectionstart == 0 && parenttxt.text != "")
   {
    if (int.parse(parenttxt.text) > 255)
    {
    messagebox.show(parenttxt.text + "不是有效项。请指定一个介于1和255之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    parenttxt.text = "255";
    parenttxt.selectionstart = 0;
    }
    else
    {
    txt_2.focus();
    }
   }
   else if (parenttxt.text == "")
   {
    txt_2.focus();
   }
   break;
   case "4":
   if (parenttxt.selectionstart == 0 && parenttxt.text != "")
   {
    if (int.parse(parenttxt.text) > 255)
    {
    messagebox.show(parenttxt.text + "不是有效项。请指定一个介于1和255之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    parenttxt.text = "255";
    parenttxt.selectionstart = 0;
    }
    else
    {
    txt_3.focus();
    }
   }
   else if (parenttxt.text == "")
   {
    txt_3.focus();
   }
   break;
  }
  }
  else if (e.keycode == keys.right)
  {
  switch (parenttxt.name.split('_')[1])
  {
   case "1":
   if (parenttxt.selectionstart == parenttxt.text.length && parenttxt.text != "")
   {
    if (int.parse(parenttxt.text) > 223)
    {
    messagebox.show(parenttxt.text + "不是有效项。请指定一个介于1和223之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    parenttxt.text = "223";
    parenttxt.selectionstart = parenttxt.text.length;
    }
    else
    {
    txt_2.focus();
    }
   }
   else if (parenttxt.text == "")
   {
    txt_2.focus();
   }
   break;
   case "2":
   if (parenttxt.selectionstart == parenttxt.text.length && parenttxt.text != "")
   {
    if (int.parse(parenttxt.text) > 255)
    {
    messagebox.show(parenttxt.text + "不是有效项。请指定一个介于1和255之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    parenttxt.text = "255";
    parenttxt.selectionstart = parenttxt.text.length;
    }
    else
    {
    txt_3.focus();
    }
   }
   else if (parenttxt.text == "")
   {
    txt_3.focus();
   }
   break;
   case "3":
   if (parenttxt.selectionstart == parenttxt.text.length && parenttxt.text != "")
   {
    if (int.parse(parenttxt.text) > 255)
    {
    messagebox.show(parenttxt.text + "不是有效项。请指定一个介于1和255之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    parenttxt.text = "255";
    parenttxt.selectionstart = parenttxt.text.length;
    }
    else
    {
    txt_4.focus();
    }
   }
   else if (parenttxt.text == "")
   {
    txt_4.focus();
   }
   break;
   case "4":
   break;
  }
  }
 }
 public void txt_keypress(object sender, keypresseventargs e)
 {
  parenttxt = (textbox)sender;
  regex regex = new regex(@"^[0-9]+$");
  if (!regex.ismatch(e.keychar.tostring()) && e.keychar != (char)keys.back)
  {
  e.handled = true;
  }
  else if (e.keychar == (char)keys.back)
  {
  e.handled = false;
  switch (parenttxt.name.split('_')[1])
  {
   case "1":
   break;
   case "2":
   if (parenttxt.selectionstart == 0)
   {
    txt_1.focus();
    if (txt_1.text != "")
    {
    txt_1.text = txt_1.text.substring(0, txt_1.text.length - 1);
    }
    txt_1.selectionstart = txt_1.text.length;
   }
   break;
   case "3":
   if (parenttxt.selectionstart == 0)
   {
    txt_2.focus();
    if (txt_2.text != "")
    {
    txt_2.text = txt_2.text.substring(0, txt_2.text.length - 1);
    }
    txt_2.selectionstart = txt_2.text.length;
   }
   break;
   case "4":
   if (parenttxt.selectionstart == 0)
   {
    txt_3.focus();
    if (txt_3.text != "")
    {
    txt_3.text = txt_3.text.substring(0, txt_3.text.length - 1);
    }
    txt_3.selectionstart = txt_3.text.length;
   }
   break;
  }
  }
  else
  {
  switch (parenttxt.name.split('_')[1])
  {
   case "1":
   if (parenttxt.selectionstart == parenttxt.text.length)
   {
    if (int.parse(parenttxt.text + e.keychar.tostring()) > 223)
    {
    messagebox.show(parenttxt.text + e.keychar.tostring() + "不是有效项。请指定一个介于1和223之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    e.handled = true;
    parenttxt.text = "223";
    }
    else
    {
    e.handled = false;
    }
   }
   else if(parenttxt.text.length != 3)
   {
    e.handled = false;
   }
   else
   {
    e.handled = true;
   }
   break;
   default:
   if (parenttxt.selectionstart == parenttxt.text.length)
   {
    if (int.parse(parenttxt.text + e.keychar.tostring()) > 255)
    {
    messagebox.show(parenttxt.text + e.keychar.tostring() + "不是有效项。请指定一个介于1和255之间的值。", "错误", messageboxbuttons.ok, messageboxicon.warning);
    e.handled = true;
    parenttxt.text = "255";
    }
    else
    {
    e.handled = false;
    }
   }
   else if (parenttxt.text.length != 3)
   {
    e.handled = false;
   }
   else
   {
    e.handled = true;
   }
   break;
  }
  }
 }
 public void txt_textchanged(object sender, eventargs e)
 {
  if (parenttxt.text.length == 3)
  {
  switch (parenttxt.name.split('_')[1])
  {
   case "1":
   if (parenttxt.selectionstart == parenttxt.text.length)
   {
    txt_2.focus();
   }
   break;
   case "2":
   if (parenttxt.selectionstart == parenttxt.text.length)
   {
    txt_3.focus();
   }
   break;
   case "3":
   if (parenttxt.selectionstart == parenttxt.text.length)
   {
    txt_4.focus();
   }
   break;
   case "4":
   break;
  }
  }
 }
 }
}

controltext.cs

using system;
using system.collections.generic;
using system.componentmodel;
using system.drawing;
using system.data;
using system.text;
using system.windows.forms;
using system.text.regularexpressions;

namespace ipinputcontrol.ctrl
{
 public partial class controltext : textbox
 {
 public controltext()
 {
  initializecomponent();
 }
 public void txt_textchange(object sender, eventargs e)
 {
  if (this.text.length == 3)
  {
  sendkeys.send("{tab}");
  }
 }
 protected override bool processcmdkey(ref message msg, keys keydata)
 {
  if (keydata == keys.tab)
  {
  return true;
  }
  return base.processcmdkey(ref msg, keydata);
 }
 }
}

更多完整代码请点击下载：winform ip地址输入框控件

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。