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脚本之家。
