C#创建用户控件：IPv4地址输入框

最新推荐文章于 2025-06-18 09:58:14 发布

秦建辉

最新推荐文章于 2025-06-18 09:58:14 发布

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CC 4.0 BY-SA版权

文章标签： c# textbox components string byte null

本文链接：https://blog.youkuaiyun.com/jhqin/article/details/5823363

本文介绍了一款优化后的IPv4地址输入控件，该控件采用C#开发，能够智能验证和显示标准的IPv4地址，并具备自动跳转、限制输入等功能。此外，还提供了IP地址类型判断和边框样式设置。

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对网上的例子做了代码优化。

开发语言：C#

控件名称：IPv4地址输入框

控件样式：

控件属性：

Text：获取或设置string类型的IP地址

Value：获取或设置IPAddress类型的IP地址

Type：获取IP地址所属分类。分A、B、C、D、E 5大类。

BorderStyle：获取或设置控件的边框样式。

源代码：UserControl_IPv4TextBox.cs

using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Windows.Forms; using System.Text.RegularExpressions; using System.Net; namespace IPv4TextBox { public enum IPType : byte { A, B, C, D, E }; public class UserControl_IPv4TextBox : UserControl { private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.TextBox textBox2; private System.Windows.Forms.TextBox textBox3; private System.Windows.Forms.TextBox textBox4; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.Label label3; /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// 清理所有正在使用的资源。 /// </summary> /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region 组件设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要 /// 使用代码编辑器修改此方法的内容。 /// </summary> private void InitializeComponent() { // 通过注册表获取系统默认字体 string DefaultFontFaceName = (string)Microsoft.Win32.Registry.GetValue(@"HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows NT/CurrentVersion/GRE_Initialize", "GUIFont.Facename", "SimSun"); this.textBox1 = new System.Windows.Forms.TextBox(); this.textBox2 = new System.Windows.Forms.TextBox(); this.textBox3 = new System.Windows.Forms.TextBox(); this.textBox4 = 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.SuspendLayout(); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(0, 3); this.textBox1.MaxLength = 3; this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(37, 21); this.textBox1.TabIndex = 0; this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center; this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress); // // textBox2 // this.textBox2.Location = new System.Drawing.Point(57, 3); this.textBox2.MaxLength = 3; this.textBox2.Name = "textBox2"; this.textBox2.Size = new System.Drawing.Size(37, 21); this.textBox2.TabIndex = 1; this.textBox2.TextAlign = System.Windows.Forms.HorizontalAlignment.Center; this.textBox2.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress); // // textBox3 // this.textBox3.Location = new System.Drawing.Point(114, 3); this.textBox3.MaxLength = 3; this.textBox3.Name = "textBox3"; this.textBox3.Size = new System.Drawing.Size(37, 21); this.textBox3.TabIndex = 2; this.textBox3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center; this.textBox3.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress); // // textBox4 // this.textBox4.Location = new System.Drawing.Point(171, 3); this.textBox4.MaxLength = 3; this.textBox4.Name = "textBox4"; this.textBox4.Size = new System.Drawing.Size(37, 21); this.textBox4.TabIndex = 3; this.textBox4.TextAlign = System.Windows.Forms.HorizontalAlignment.Center; this.textBox4.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.IPv4TextBox_KeyPress); // // label1 // this.label1.AutoSize = true; this.label1.Font = new System.Drawing.Font(DefaultFontFaceName, 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.label1.Location = new System.Drawing.Point(39, 5); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(16, 16); this.label1.TabIndex = 4; this.label1.Text = "."; this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; // // label2 // this.label2.AutoSize = true; this.label2.Font = new System.Drawing.Font(DefaultFontFaceName, 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.label2.Location = new System.Drawing.Point(96, 5); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(16, 16); this.label2.TabIndex = 5; this.label2.Text = "."; this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; // // label3 // this.label3.AutoSize = true; this.label3.Font = new System.Drawing.Font(DefaultFontFaceName, 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.label3.Location = new System.Drawing.Point(153, 5); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(16, 16); this.label3.TabIndex = 6; this.label3.Text = "."; this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; // // UserControl_IPv4TextBox // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.Controls.Add(this.label3); this.Controls.Add(this.label2); this.Controls.Add(this.label1); this.Controls.Add(this.textBox4); this.Controls.Add(this.textBox3); this.Controls.Add(this.textBox2); this.Controls.Add(this.textBox1); this.Name = "UserControl_IPv4TextBox"; this.Size = new System.Drawing.Size(212, 30); this.ResumeLayout(false); this.PerformLayout(); } #endregion public UserControl_IPv4TextBox() { InitializeComponent(); } private void IPv4TextBox_KeyPress(object sender, KeyPressEventArgs e) { char KeyChar = e.KeyChar; int TextLength = ((TextBox)sender).TextLength; if (KeyChar == '.' || KeyChar == '。' || KeyChar == ' ') { if ((((TextBox)sender).SelectedText.Length == 0) && (TextLength > 0) && (((TextBox)sender) != textBox4)) { // 进入下一个文本框 SendKeys.Send("{Tab}"); } e.Handled = true; } if (Regex.Match(KeyChar.ToString(), "[0-9]").Success) { if (TextLength == 2) { if (int.Parse(((TextBox)sender).Text + e.KeyChar.ToString()) > 255) { e.Handled = true; } } else if (TextLength == 0) { if (KeyChar == '0') { e.Handled = true; } } } else { // 回删操作 if (KeyChar == '/b') { if (TextLength == 0) { if (((TextBox)sender) != textBox1) { // 回退到上一个文本框 Shift+Tab SendKeys.Send("+{TAB}{End}"); } } } else { e.Handled = true; } } } /// <summary> /// string类型的IP地址 /// </summary> override public string Text { get { return this.Value.ToString(); } set { IPAddress address; if (IPAddress.TryParse(value, out address)) { byte[] bytes = address.GetAddressBytes(); for (int i = 1; i <= 4; i++) { this.Controls["textBox" + i.ToString()].Text = bytes[i - 1].ToString("D"); } } } } /// <summary> /// IP地址 /// </summary> public IPAddress Value { get { IPAddress address; string ipString = textBox1.Text + "." + textBox2.Text + "." + textBox3.Text + "." + textBox4.Text; if (IPAddress.TryParse(ipString, out address)) { return address; } else { return new IPAddress(0); } } set { byte[] bytes = value.GetAddressBytes(); for (int i = 1; i <= 4; i++) { this.Controls["textBox" + i.ToString()].Text = bytes[i - 1].ToString("D"); } } } /// <summary> /// IP地址分类 /// </summary> public IPType Type { get { byte[] bytes = this.Value.GetAddressBytes(); int FirstByte = bytes[0]; if (FirstByte < 128) { return IPType.A; } else if (FirstByte < 192) { return IPType.B; } else if (FirstByte < 224) { return IPType.C; } else if (FirstByte < 240) { return IPType.D; } else { return IPType.E; // 保留做研究用 } } } /// <summary> /// 控件的边框样式 /// </summary> new public BorderStyle BorderStyle { get { return this.textBox1.BorderStyle; } set { for (int i = 1; i <= 4; i++) { ((TextBox)this.Controls["textBox" + i.ToString()]).BorderStyle = value; } } } } }