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 \r
  12 using System;
  13 using System.ComponentModel;\r
  14 using System.Web;\r
  15 using System.Web.UI;\r
  16 using System.Text.RegularExpressions;\r
  17 \r
  18 namespace System.Web.UI.WebControls\r
  19 {\r
  20         [ToolboxData("<{0}:RegularExpressionValidator runat=\"server\" "\r
  21                       + "ErrorMessage=\"RegularExpressionValidator\">"\r
  22                       + "</{0}:RegularExpressionValidator>")]\r
  23         public class RegularExpressionValidator : BaseValidator\r
  24         {\r
  25                 public RegularExpressionValidator(): base()\r
  26                 {\r
  27                 }\r
  28
  29                 [DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
  30                 [Editor ("System.Web.UI.Design.WebControls.RegexTypeEditor, " + Consts.AssemblySystem_Design, typeof (System.Drawing.Design.UITypeEditor))]
  31                 [WebSysDescription ("A regular expression that is used to validate.")]\r
  32                 public string ValidationExpression\r
  33                 {\r
  34                         get\r
  35                         {\r
  36                                 object o = ViewState["ValidationExpression"];\r
  37                                 if(o != null)\r
  38                                 {\r
  39                                         return (string)o;\r
  40                                 }\r
  41                                 return String.Empty;\r
  42                         }\r
  43                         set\r
  44                         {\r
  45                                 try\r
  46                                 {\r
  47                                         Regex.IsMatch("", value);\r
  48                                 } catch(Exception)\r
  49                                 {\r
  50                                         throw new HttpException(HttpRuntime.FormatResourceString("Validator_bad_regex", value));\r
  51                                 }\r
  52                                 ViewState["ValidationExpression"] = value;\r
  53                         }\r
  54                 }\r
  55 \r
  56                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
  57                 {\r
  58                         base.AddAttributesToRender(writer);\r
  59                         if(base.RenderUplevel)\r
  60                         {\r
  61                                 writer.AddAttribute("evaluationfunction", "RegularExpressionValidatorEvaluateIsValid");\r
  62                                 string exp = ValidationExpression;\r
  63                                 if(exp.Length > 0)\r
  64                                 {\r
  65                                         writer.AddAttribute("validationexpression", exp);\r
  66                                 }\r
  67                         }\r
  68                 }\r
  69 \r
  70                 protected override bool EvaluateIsValid ()\r
  71                 {\r
  72                         string ctrl = GetControlValidationValue (ControlToValidate);\r
  73                         if (ctrl == null || ctrl.Trim ().Length == 0)\r
  74                                 return true;\r
  75 \r
  76                         bool retVal;\r
  77                         try {\r
  78                                 retVal = Regex.IsMatch (ctrl, "^" + ValidationExpression + "$");
  79                         } catch (Exception) {\r
  80                                 retVal = true;\r
  81                         }\r
  82                         return retVal;\r
  83                 }\r
  84         }\r
  85 }\r