自定义控件只允许输入Decimal和int类型字符串

来源：互联网发布：淘宝上的芝士零食知乎编辑：程序博客网时间：2024/04/29 23:49

自定义控件中只放了一个TextBox控件，并在TextBox下利用自定义控件的Paint画了一条线，然后给TextBox做了3个自定义属性，分别是TextBoxText属性，方便取值；IntBool属性，是否只输入正整数；inputDecimal是否只能输入小数。

以下是整个自定义控件的源代码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Linq;using System.Text;using System.Windows.Forms;using System.Text.RegularExpressions;namespace GCIMS.CommonCtrl{    public partial class ctrlUnderlineTextBox : UserControl    {        #region 属性        /// <summary>        /// 控件的文本        /// </summary>        [Description("文本值"), Browsable(true), Category("自定义属性")]        public string TextBoxText        {            get            {                return textBox.Text;            }            set            {                textBox.Text = value;            }        }        private bool intBool;        /// <summary>        /// 只输入正整数        /// </summary>        [Description("只输入正整数"), Browsable(true), Category("自定义属性"), DefaultValue(false)]        public bool IntBool        {            get            {                return intBool;            }            set            {                intBool = value;                if (intBool)                {                    textBox.KeyPress += new KeyPressEventHandler(IntBool_KeyPress);                }            }        }        private bool inputDecimal;        /// <summary>        /// 只输入小数        /// </summary>        [Description("只输入小数"), Browsable(true), Category("自定义属性"), DefaultValue(false)]        public bool InputDecimal        {            get            {                return inputDecimal;            }            set            {                inputDecimal = value;                if (inputDecimal)                {                    textBox.KeyPress += new KeyPressEventHandler(InputDecimal_KeyPress);                }            }        }        #endregion        #region 构造函数        public ctrlUnderlineTextBox()        {            InitializeComponent();        }        #endregion        #region 事件-ctrlUnderlineTextBox_KeyPress        private void IntBool_KeyPress(object sender, KeyPressEventArgs e)        {            if ((int)e.KeyChar >= 48 && (int)e.KeyChar <= 57 && textBox.Text.Length < 18 || (int)e.KeyChar == 8) //只能输入0-9数字和BackSpace            {                e.Handled = false;            }            else            {                e.Handled = true;            }        }        #endregion        #region 事件-InputDecimal_KeyPress        private void InputDecimal_KeyPress(object sender, KeyPressEventArgs e)        {            //搜索字符串中的'.'字符            string textBoxStr = textBox.Text;            Regex rg = new Regex(".");            MatchCollection mc = rg.Matches(textBoxStr);            int textBoxCount = mc.Count;            //允许输入数字，小数点，退格键，不允许输入大于18为的数字，不允许输入两个小数点            if ((int)e.KeyChar >= 48 && (int)e.KeyChar <= 57 && textBox.Text.Length < 18 || (int)e.KeyChar == 8 || e.KeyChar == '.' && textBoxCount <= 1) //只能输入0-9数字和BackSpace            {                e.Handled = false;            }            else            {                e.Handled = true;            }        }        #endregion        #region 事件-CtrlUnderlineTextBox_Paint        private void CtrlUnderlineTextBox_Paint(object sender, PaintEventArgs e)        {            Graphics g = Graphics.FromHwnd(this.Handle);            System.Drawing.Pen pen = new Pen(Color.Black);            PointF point1 = new PointF(textBox.Location.X, textBox.Location.Y + textBox.Height);            PointF point2 = new PointF(textBox.Location.X + textBox.Width, textBox.Location.Y + textBox.Height);            g.DrawLine(pen, point1, point2);        }        #endregion    }}

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