只能输入int数字的文本控件
using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Text;using System.Windows.Forms;namespace Renters.UI{ public partial class txtIntBox : UserControl { public txtIntBox() { InitializeComponent(); } /// 时间：2007-8-20 /// 修改：CAKEBIRD /// 功能：用户控件实现对text只能输入int型数字的控制 /// 更新记录 /// 时间：2007-8-29 /// 修改功能：增加数据大于0判断 public string txt_Text { get { return this.textBox1.Text.Trim().ToString(); } set { this.textBox1.Text = value; } } //文本框的ReadOnly属性 public bool ReadOnly { get { return this.textBox1.ReadOnly; } set { this.textBox1.ReadOnly = value; } } private void textBox1_TextChanged(object sender, EventArgs e) { string txt = textBox1.Text.ToString(); if (txt != "") { if (tbchange(txt)) { } else { textBox1.Text = txt.Remove(txt.Length - 1); textBox1.Select(textBox1.Text.Length, 0); } } } private bool tbchange(string txt) { try { double i = System.Int32.Parse(txt); if (i < 0) { return false; } return true; } catch { return false; } } private void txtIntBox_Load(object sender, EventArgs e) { textBox1.Width = this.Size.Width; } }}