Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / RegularExpressionValidator.cs / 1 / RegularExpressionValidator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Web.UI.WebControls { using System.ComponentModel; using System.ComponentModel.Design; using System.Text.RegularExpressions; using System.Drawing.Design; using System.Web; using System.Security.Permissions; using System.Web.Util; ////// [ ToolboxData("<{0}:RegularExpressionValidator runat=\"server\" ErrorMessage=\"RegularExpressionValidator\">{0}:RegularExpressionValidator>") ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class RegularExpressionValidator : BaseValidator { ///Checks if the value of the associated input control matches the pattern /// of a regular expression. ////// [ WebCategory("Behavior"), Themeable(false), DefaultValue(""), Editor("System.Web.UI.Design.WebControls.RegexTypeEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), WebSysDescription(SR.RegularExpressionValidator_ValidationExpression) ] public string ValidationExpression { get { object o = ViewState["ValidationExpression"]; return((o == null) ? String.Empty : (string)o); } set { try { Regex.IsMatch(String.Empty, value); } catch (Exception e) { throw new HttpException( SR.GetString(SR.Validator_bad_regex, value), e); } ViewState["ValidationExpression"] = value; } } ///Indicates the regular expression assigned to be the validation criteria. ////// /// AddAttributesToRender method /// protected override void AddAttributesToRender(HtmlTextWriter writer) { base.AddAttributesToRender(writer); if (RenderUplevel) { string id = ClientID; HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering) ? writer : null; AddExpandoAttribute(expandoAttributeWriter, id, "evaluationfunction", "RegularExpressionValidatorEvaluateIsValid", false); if (ValidationExpression.Length > 0) { AddExpandoAttribute(expandoAttributeWriter, id, "validationexpression", ValidationExpression); } } } ////// /// EvaluateIsValid method /// protected override bool EvaluateIsValid() { // Always succeeds if input is empty or value was not found string controlValue = GetControlValidationValue(ControlToValidate); Debug.Assert(controlValue != null, "Should have already been checked"); if (controlValue == null || controlValue.Trim().Length == 0) { return true; } try { // we are looking for an exact match, not just a search hit Match m = Regex.Match(controlValue, ValidationExpression); return(m.Success && m.Index == 0 && m.Length == controlValue.Length); } catch { Debug.Fail("Regex error should have been caught in property setter."); return true; } } } }
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