mcs/class/System.Web/System.Web.UI.WebControls/RegularExpressionValidator.cs

   1 //
   2 // System.Web.UI.WebControls.RegularExpressionValidator.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Gaurav Vaish (2002)
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.ComponentModel;
  35 using System.Web;
  36 using System.Web.UI;
  37 using System.Text.RegularExpressions;
  38
  39 namespace System.Web.UI.WebControls
  40 {
  41         [ToolboxData("<{0}:RegularExpressionValidator runat=\"server\" "
  42                       + "ErrorMessage=\"RegularExpressionValidator\">"
  43                       + "</{0}:RegularExpressionValidator>")]
  44         public class RegularExpressionValidator : BaseValidator
  45         {
  46                 public RegularExpressionValidator(): base()
  47                 {
  48                 }
  49
  50                 [DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
  51                 [Editor ("System.Web.UI.Design.WebControls.RegexTypeEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
  52                 [WebSysDescription ("A regular expression that is used to validate.")]
  53                 public string ValidationExpression
  54                 {
  55                         get
  56                         {
  57                                 object o = ViewState["ValidationExpression"];
  58                                 if(o != null)
  59                                 {
  60                                         return (string)o;
  61                                 }
  62                                 return String.Empty;
  63                         }
  64                         set
  65                         {
  66                                 try
  67                                 {
  68                                         Regex.IsMatch("", value);
  69                                 } catch(Exception)
  70                                 {
  71                                         throw new HttpException(HttpRuntime.FormatResourceString("Validator_bad_regex", value));
  72                                 }
  73                                 ViewState["ValidationExpression"] = value;
  74                         }
  75                 }
  76
  77                 protected override void AddAttributesToRender(HtmlTextWriter writer)
  78                 {
  79                         base.AddAttributesToRender(writer);
  80                         if(base.RenderUplevel)
  81                         {
  82                                 writer.AddAttribute("evaluationfunction", "RegularExpressionValidatorEvaluateIsValid");
  83                                 string exp = ValidationExpression;
  84                                 if(exp.Length > 0)
  85                                 {
  86                                         writer.AddAttribute("validationexpression", exp);
  87                                 }
  88                         }
  89                 }
  90
  91                 protected override bool EvaluateIsValid ()
  92                 {
  93                         string ctrl = GetControlValidationValue (ControlToValidate);
  94                         if (ctrl == null || ctrl.Trim ().Length == 0)
  95                                 return true;
  96
  97                         bool retVal;
  98                         try {
  99                                 retVal = Regex.IsMatch (ctrl, "^" + ValidationExpression + "$");
 100                         } catch (Exception) {
 101                                 retVal = true;
 102                         }
 103                         return retVal;
 104                 }
 105         }
 106 }