c#数字文本框控件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace wfp.classlibrary
{
    public partial class BASC_NUMTEXT : TextBox
    {
        public BASC_NUMTEXT(int MaxLength, DataTable DT)
        {
      
            InitializeComponent();
            MaxLength = MaxLength < 0 ? 100 : MaxLength;
            base.Width = MaxLength < 100 ? 100 : (MaxLength > 255 ? 255 : MaxLength);
            base.MaxLength = MaxLength;
            meColor = this.BackColor;
        }
        private string vformat;
        private bool isformat = true;
        public string TextFormat
        {
            get { return vformat; }
            set
            {
                vformat = value;
            }
        }
        [Description("是否执行格式化")]
        public bool IsFormat
        {
            get { return isformat; }
            set
            {
                isformat = value;
            }
        }

        #region 限制输入数字
        private string strText;
        private int iCur;
        private Color meColor;

        protected override bool ProcessKeyEventArgs(ref   Message m)
        {
            int s = m.WParam.ToInt32();
            string xsfh = System.Globalization.NumberFormatInfo.CurrentInfo.CurrencyDecimalSeparator;
            int xsfg = System.Text.Encoding.Default.GetBytes(xsfh)[0];
            #region

            if (s == 46)//判断是否小数点
            {
                if (xsfg != 46)
                {
                    m.WParam = new IntPtr(xsfg);
                }
                if (this.Text.Contains(xsfh) == true)
                {
                    return true;
                }
            }
            else if (s == xsfg)
            {
                if (this.Text.Contains(xsfh) == true)
                {
                    return true;
                }
            }
            else if (s != 17 && s != 1 && s != 65 && s != 99 && s != 118) //ctrl 控制 a c v
            {
                if (m.Msg == 0x0102 || m.Msg == 257) //|| m.Msg == 256
                {
                    if ((s != 45 && s < 48 & s != 8 && s != 13 && s != 9 && s != 37 && s != 39 && s != 36 && s != 35 && s != 46)
                       || (s > 57 && s != 189 && s != 110))
                        return true;
                }
            }
            else if (s == 65)
            {
                this.SelectAll();
            }
            else if (s == 99)
            {
                if (string.IsNullOrEmpty(this.SelectedText) == false)
                {
                    Clipboard.SetText(this.SelectedText);
                }
                return true;
            }
            else if (s == 118)
            {
                if (string.IsNullOrEmpty(Clipboard.GetText()) == false)
                {
                    this.SelectedText += Clipboard.GetText();
                }
                return true;
            }

            strText = this.Text;
            iCur = this.SelectionStart;
            #endregion
            return base.ProcessKeyEventArgs(ref   m);
        }
        protected override void OnLeave(EventArgs e)
        {
            RunFormat();
            base.OnLeave(e);
        }
        protected override void OnTextChanged(EventArgs e)
        {
         string xsdfg = System.Globalization.NumberFormatInfo.CurrentInfo.CurrencyDecimalSeparator;
            string regstr;
            if (xsdfg != ".")
            {
                regstr = @"^(-?[0-9]*[" + xsdfg + "]*[.]*[0-9]{0,8})$";
            }
            else
            {
                regstr = @"^(-?[0-9]*[.]*[0-9]{0,8})$";
            }

            System.Text.RegularExpressions.Regex reg
              = new System.Text.RegularExpressions.Regex(regstr);
            if (reg.IsMatch(this.Text))
            {
                if (this.Text.Length == 30)
                {
                    this.Text = strText;
                    this.SelectionStart = iCur;
                    this.BackColor = System.Drawing.Color.FromName("mistyrose");
                }
                else if (this.BackColor == System.Drawing.Color.FromName("mistyrose"))
                {
                    this.BackColor = meColor;
                }
            }
            else
            {
                if (WFPPublic.DataCtrl.IsPositveDecimal(this.Text) == false)
                {
                    this.Text = strText;
                   
                }
                this.SelectionStart = iCur;
            }
            if (this.Focused == false)
            {
                RunFormat();
            }
            base.OnTextChanged(e);
        }
 
        private void RunFormat()
        {
            if (isformat == true)
            {
                if (string.IsNullOrEmpty(this.Text) == true)
                {
                    return;
                }
                try
                {
                    decimal dv = decimal.Parse(this.Text);
                    if (string.IsNullOrEmpty(vformat) == false)
                    {
                        // this.Text = string.Format(vformat, dv);// dv.ToString(vformat);
                        this.Text = dv.ToString(vformat);
                    }
                    else
                    {
                        string constr = "0";
                        if (constr == "")
                        {
                            this.Text = dv.ToString("###########################.######");
                        }
                        else if (constr == "0")
                        {
                            this.Text = dv.ToString("##########################0.######");
                        }
                        else
                        {
                            int ovs = WFPPublic.DataCtrl.StrToInt(constr);
                            if (ovs > 0)
                            {
                                string fz = "0";
                                this.Text = dv.ToString("##########################0." + fz.PadLeft(ovs, '0') + "#####");
                            }
                        }
                    }
                }
                catch
                { }
            }
        }
        #endregion
    }
}