RegularExpressionValidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / RegularExpressionValidator.cs / 1305376 / 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.Web.Util; 

 
    /// 
    ///    Checks if the value of the associated input control matches the pattern
    ///       of a regular expression.
    ///  
    [
    ToolboxData("<{0}:RegularExpressionValidator runat=\"server\" ErrorMessage=\"RegularExpressionValidator\">") 
    ] 
    public class RegularExpressionValidator : BaseValidator {
 

        /// 
        ///    Indicates the regular expression assigned to be the validation criteria.
        ///  
        [
        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; 
            }
        } 


        /// 
        ///  
        ///    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; 
            }
        } 
 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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