服务器控件开发之一：数值型控件

数值型控件是比较麻烦的事，经常看到大家在论谈里，讲要求输入数值型控件。问了N遍不得结果，怎么做出来都不太满意，其实真做好还是比较难的。我想将我写的一个让大家参考参考，并帮助测试。
控件名称： NumericTextBox 数据类型： float型，正float型，负float型，正数，正整数，负正数(除此之外，不知道还有没有其他类型有欢迎大家提出来，加上去)。 功能 除支持上述六种类型外，还支持粘贴数值型数据，非数值型粘贴不进去。
具体代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CustomAjaxToolKit
...{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:NumericTextBox runat=server></{0}:NumericTextBox>")]
    public class NumericTextBox : TextBox
    ...{
        private string strInteger = @"^([+-]?)/d+$";   //整数
        private string strPlusInteger = @"^([+]?)/d+$";//正整数
        private string strNegativeInteger = @"^-/d+$"; //负整数

        private string strDecimal = @"^([+-]?)/d*/.?/d+$";   //小数(含正负)
        private string strPlusDecimal = @"^([+]?)/d*/.?/d+$";//正小数
        private string strNegativeDecimal = @"^-/d*/.?/d+$"; //负小数

        private string strHeader = "<script language="javascript" type="text/javascript"> <!--  ";
        private string strFooter = "-->  </script>";
        //限制输入字符清单：
            //keycode 48-57表示0-9
            //keycode 107  表示+
            //keycode 45   表示-
            //keycode 46   表示小数点

        //如下表达式表示输入的可以是正负float类型数据
        //if(!((keycode>47&&keycode<58)||keycode==107||keycode==45||keycode==46))  
        private string strAllDecKeyPressExpr = "  if(!((keycode>47&&keycode<58)||keycode==107||keycode==45||keycode==46))  ";

        //如下表达式表示输入的可以是正float类型数据
        //if(!((keycode>47&&keycode<58)||keycode==107||keycode==46))  
        private string strPlusDecKeyPressExpr = "  if(!((keycode>47&&keycode<58)||keycode==107||keycode==46))  ";

        //如下表达式表示输入的可以是负float类型数据
        //if(!((keycode>47&&keycode<58)||keycode==45||keycode==46))  
        private string strNegativeDecKeyPressExpr = "  if(!((keycode>47&&keycode<58)||keycode==45||keycode==46))  ";

        //如下表达式表示输入的可以是正负整数类型数据
        //if(!((keycode>47&&keycode<58)||keycode==107||keycode==45))  
        private string strAllIntKeyPressExpr = "  if(!((keycode>47&&keycode<58)||keycode==107||keycode==45))  ";

        //如下表达式表示输入的可以是正整数类型数据
        //if(!((keycode>47&&keycode<58)||keycode==107))  
        private string strPlusIntKeyPressExpr = "  if(!((keycode>47&&keycode<58)||keycode==107))  ";

        //如下表达式表示输入的可以是负整数类型数据
        //if(!((keycode>47&&keycode<58)||keycode==45))  
        private string strNegativeIntKeyPressExpr = "  if(!((keycode>47&&keycode<58)||keycode==45))  ";

        //检查“-”号的合法性，如果不合法，则清除输入的不合法“－”号
        private string strNavDecIntValidateValue = "  str=ctrl.value; " +
                                                 "  var nNumerics= str.split("-");    " +
                                                 "  if(str.substring(0,1)!="-") " +
                                                 "  { " +
                                                 "      if(nNumerics.length==2) " +
                                                 "      { " +
                                                 "           ctrl.value=str.substring(0,str.length-1); " +
                                                 "      } " +
                                                 "      return; " +
                                                 "  } " +
                                                 "  else if(str.substring(0,1)=="-") " +
                                                 "  { " +
                                                 "      if(nNumerics.length==3) " +
                                                 "      { " +
                                                 "          ctrl.value=str.substring(0,1)+str.substring(1,str.length-1); " +
                                                 "      } " +
                                                 "  }  ";

        //检查“+”号的合法性，如果不合法，则清除输入的不合法“+”号
        private string strPlusDecIntValidateValue = "  str=ctrl.value; " +
                                                 "  var pNumerics= str.split("+");    " +
                                                 "  if(str.substring(0,1)!="+") " +
                                                 "  { " +
                                                 "      if(pNumerics.length==2) " +
                                                 "      { " +
                                                 "           ctrl.value=str.substring(0,str.length-1); " +
                                                 "      } " +
                                                 "      return; " +
                                                 "  } " +
                                                 "  else if(str.substring(0,1)=="+") " +
                                                 "  { " +
                                                 "      if(pNumerics.length==3) " +
                                                 "      { " +
                                                 "          ctrl.value=str.substring(0,1)+str.substring(1,str.length-1); " +
                                                 "      } " +
                                                 "  }  ";


        [DefaultValue(2)]
        [Description("设置小数位位数，如：2位，设置为2，数字123.23")]
        public int Digital
        ...{
            get
            ...{
                object o = (object)ViewState["Digital"];
                return (o == null) ? 0 : (int)o;
            }
            set
            ...{
                ViewState["Digital"] = value;
            }
        }

        [DefaultValue(NumericType.Decimal)]
        [Description("数据类型六种：Decimal－小数(含正负),PlusDecimal－正小数,NegativeDecimal－负小数;Integer－整数(含正负),PlusInteger－正整数,NegativeInteger－负整数")]
        public NumericType NumType
        ...{
            get 
            ...{
                object o = (object)ViewState["NumType"];
                return (o == null) ? NumericType.Decimal : (NumericType)o;
            }
            set
            ...{
                ViewState["NumType"] = value;
            }
        }

        //复写AddAttributesToRender方法，将相关客户端的操作事件写进控件属性
        protected override void AddAttributesToRender(HtmlTextWriter writer)
        ...{
            this.Attributes.Add("onkeypress", "NumericTextBox_KeyPress()");
            this.Attributes.Add("onkeyup", "NumericTextBox_KeyUp(this)");
            this.Attributes.Add("onpaste", "return NumericTextBox_Paste()");
            base.AddAttributesToRender(writer);
        }

        //将控件的注册业务逻辑
        protected override void OnPreRender(EventArgs e)
        ...{
            string strScript = strHeader;
            strScript = strScript + "function NumericTextBox_KeyPress()   ";
            strScript = strScript + "{  ";
            strScript = strScript + "  var keycode=event.keyCode;  ";

            switch (NumType)
            ...{ 
                case NumericType.Decimal:
                    strScript = strScript + strAllDecKeyPressExpr;
                    break;
                case NumericType.PlusDecimal:
                    strScript = strScript + strPlusDecKeyPressExpr;
                    break;
                case NumericType.NegativeDecimal:
                    strScript = strScript + strNegativeDecKeyPressExpr;
                    break;
                case NumericType.Integer:
                    strScript = strScript + strAllIntKeyPressExpr;
                    break;
                case NumericType.PlusInteger:
                    strScript = strScript + strPlusIntKeyPressExpr;
                    break;
                case NumericType.NegativeInteger:
                    strScript = strScript + strNegativeIntKeyPressExpr;
                    break;
            }

            strScript = strScript + "  {    ";
            strScript = strScript + "      event.keyCode= 0;  ";
            strScript = strScript + "  }    ";
            strScript = strScript + "}  ";
            strScript = strScript + "function NumericTextBox_KeyUp(ctrl) ";
            strScript = strScript + "{  ";
            if ((NumType == NumericType.Decimal) || (NumType == NumericType.PlusDecimal) || (NumType == NumericType.NegativeDecimal))
            ...{
                strScript = strScript + "  var str= ctrl.value;  ";
                strScript = strScript + "  var numerics= str.split(".");  ";
                strScript = strScript + "  if(numerics.length==3)  ";
                strScript = strScript + "  {   ";
                strScript = strScript + "       ctrl.value=str.substring(0,str.length-1); ";
                strScript = strScript + "  }  ";
            }

            //设置小数位
            if (NumType == NumericType.Decimal || NumType == NumericType.PlusDecimal || NumType == NumericType.NegativeDecimal)
            ...{
                strScript = strScript +"  str=ctrl.value; ";
                strScript = strScript +"  var digtPos=str.indexOf("."); ";
                strScript = strScript + " if((digtPos>=0)&&(str.length>digtPos+3)) ";
                strScript = strScript + " { ";
                strScript = strScript + "        ctrl.value=str.substring(0,digtPos+1+" + Digital.ToString().Trim() + "); ";
                strScript = strScript + " } ";
            }

            //设置小数位

            //负数清除
            if (NumType == NumericType.NegativeDecimal || NumType == NumericType.NegativeInteger)
            ...{
                strScript = strScript + "  str=ctrl.value; ";
                strScript = strScript + "  if(str.substring(0,1)!="-") ";
                strScript = strScript + "  { ";
                strScript = strScript + "        ctrl.value=""; ";
                strScript = strScript + "        return; ";
                strScript = strScript + "  } ";
            }
            //负数清除
            //if ((NumType == NumericType.Decimal) || (NumType == NumericType.Integer))
            //{
            strScript = strScript + strNavDecIntValidateValue;  //清除非法"-"
            strScript = strScript + strPlusDecIntValidateValue; //清除非法"+"
            //}

            strScript = strScript + "}  ";
            strScript = strScript + "function NumericTextBox_Paste()   ";
            strScript = strScript + "{  ";
            strScript = strScript + "  var b=clipboardData.getData('text');  ";

            switch (NumType)
            ...{ 
                case NumericType.Decimal:
                    strScript = strScript + "  var c=b.match("" + strDecimal + "");  ";
                    break;
                case NumericType.PlusDecimal:
                    strScript = strScript + "  var c=b.match("" + strPlusDecimal + "");  ";
                    break;
                case NumericType.NegativeDecimal:
                    strScript = strScript + "  var c=b.match("" + strNegativeDecimal + "");  ";
                    break;
                case NumericType.Integer:
                    strScript = strScript + "  var c=b.match("" + strInteger + "");  ";
                    break;
                case NumericType.PlusInteger:
                    strScript = strScript + "  var c=b.match("" + strPlusInteger + "");  ";
                    break;
                case NumericType.NegativeInteger:
                    strScript = strScript + "  var c=b.match("" + strNegativeInteger + "");  ";
                    break;
            }

            strScript = strScript + "return (c==null||c==false)?false:true;  ";
            strScript = strScript + "}  ";

            strScript = strScript + strFooter;
            if (!this.Page.ClientScript.IsStartupScriptRegistered("NumericScript"))
                this.Page.ClientScript.RegisterStartupScript(this.GetType(), "NumericScript", strScript);
            base.OnPreRender(e);
        }

    }

    public enum NumericType
    ...{
        Decimal,        //小数
        PlusDecimal,    //正小数
        NegativeDecimal,//负小数
        Integer,        //数数
        PlusInteger,    //正整数
        NegativeInteger //正整数
    }
}

控件缺点：
1、当输入非法字符时，可以看到相差字符闪一下，感觉不太自然，但能保证数据正确。
2、当页面提交前进行检测的话，注册客户端脚本没法通用。如果要通用，可以写成类的形式，然后进行注册客户端脚本。欢迎大家提意见！！！！！！
3、为了简单起见而用复写TextBox控件，如果大家有兴趣，则可以继承自WebControl，这样写出来不知道效果怎样，也许可能会好点，但差不多。

些控件版权归原作者所有，引用需要得到许可。
特别强调：此控件只可作为学习和研究之用，不可作为商业用途，违者必究！！！！！！