Go homepage(回首页) Upload pictures (上传图片) Write articles (发文字帖)
The author:(作者)qqpublished in(发表于) 2014/7/11 9:22:38 C#教程：KeyPress事件使用实例
C#教程：KeyPress事件使用实例|方法
KeyPress事件KeyPress事件在用户完成按键后发生。示例KeyPress事件的使用本示例中，当程序运行时，只允许在文本框中输入数字，如果文本框输入的内容不是数字，文本框中的内容会显示在窗体的标题栏上，文本框中不会显示内容。示例运行结果如图1所示。图1 KeyPress事件的使用private void textBox2_KeyPress(object sender, KeyPressEventArgs e){if (e.KeyChar != 8 && !char.IsDigit(e.KeyChar)){this.Text = e.KeyChar.ToString();e.Handled = True;}}完整程序代码如下：★ ★★★★frmKepress.cs窗体代码文件完整程序代码★★★★★using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace _2_09{public partial class frmKepress : Form{public frmKepress(){InitializeComponent();}private void frmKepress_Load(object sender, EventArgs e){}private void textBox1_KeyPress(object sender, KeyPressEventArgs e){this.Text = e.KeyChar.ToString();e.Handled = true;}private void frmKepress_Load_1(object sender, EventArgs e){}private void textBox2_KeyPress(object sender, KeyPressEventArgs e){if (e.KeyChar != 8 && !char.IsDigit(e.KeyChar)){this.Text = e.KeyChar.ToString();e.Handled = true;}}}}★ ★★★★frmKepress.desiger.cs窗体设计文件完整程序代码★★★★★namespace _2_09{partial class frmKepress{/// /// 必需的设计器变量。/// private System.ComponentModel.IContainer components = null;/// /// 清理所有正在使用的资源。/// /// 如果应释放托管资源，为 true；否则为 false。protected override void Dispose(bool disposing){if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);}#region Windows 窗体设计器生成的代码/// /// 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。/// private void InitializeComponent(){this.textBox1 = new System.Windows.Forms.TextBox();this.textBox2 = new System.Windows.Forms.TextBox();this.label1 = new System.Windows.Forms.Label();this.SuspendLayout();//// textBox1//this.textBox1.Location = new System.Drawing.Point(53, 80);this.textBox1.Name = "textBox1";this.textBox1.Size = new System.Drawing.Size(151, 21);this.textBox1.TabIndex = 0;//// textBox2//this.textBox2.Location = new System.Drawing.Point(144, 35);this.textBox2.Name = "textBox2";this.textBox2.Size = new System.Drawing.Size(100, 21);this.textBox2.TabIndex = 0;this.textBox2.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox2_KeyPress);//// label1//this.label1.AutoSize = true;this.label1.Location = new System.Drawing.Point(46, 38);this.label1.Name = "label1";this.label1.Size = new System.Drawing.Size(77, 12);this.label1.TabIndex = 1;this.label1.Text = "请输入数字：";//// frmKepress//this.ClientSize = new System.Drawing.Size(292, 105);this.Controls.Add(this.label1);this.Controls.Add(this.textBox2);this.Name = "frmKepress";this.Text = "请输入数字";this.Load += new System.EventHandler(this.frmKepress_Load_1);this.ResumeLayout(false);this.PerformLayout();}#endregionprivate System.Windows.Forms.TextBox textBox1;private System.Windows.Forms.TextBox textBox2;private System.Windows.Forms.Label label1;}}★ ★★★★Program.cs主程序文件完整程序代码★★★★★using System;using System.Collections.Generic;using System.Windows.Forms;namespace _2_09{static class Program{/// /// 应用程序的主入口点。/// [STAThread]
赞