ValidationRule Class

Verifies that requests return valid HTTP responses and that the contents of the response match the expected results. This class must be inherited.

Namespace:  Microsoft.VisualStudio.TestTools.WebTesting
Assembly:  Microsoft.VisualStudio.QualityTools.WebTestFramework (in Microsoft.VisualStudio.QualityTools.WebTestFramework.dll)

public abstract class ValidationRule

User-written validation rules must derive from this class. Validation rules are executed just after the request is complete.

Notes to Inheritors:

When you inherit from ValidationRule, you must override the Validate method and RuleName property.

The following code sample shows how to inherit from ValidationRule to make a rule that validates the existence of scripts on the Web page.

using System;
using Microsoft.VisualStudio.TestTools.WebTesting;

namespace MyValidationRule
    public class ValidatePageContainsScript : ValidationRule
        public override string RuleName
            get { return "Validate Script Existence"; }

        public override string RuleDescription
            get { return "Validates that the page has a script."; }

        public override void Validate(object sender, ValidationEventArgs e)
            bool validated = false;
            string foundJS ="";
            string foundVBS = "";

            string message = "Non-valid HTML document";

            if (e.Response.HtmlDocument != null)
            {   // Gets all input tags
                foreach (HtmlTag tag in e.Response.HtmlDocument
                    .GetFilteredHtmlTags(new string[] { "script" }))
                {   // Check type of script for current tag
                    if (tag.GetAttributeValueAsString("type") == "text/JavaScript")
                        foundJS = "Found JavaScript";
                    if (tag.GetAttributeValueAsString("type") == "text/VBScript")
                        foundVBS = "Found VBScript";

                if (foundVBS.Length != 0 || foundJS.Length != 0)
                    validated = true;
                    message = string.Format("{0} {1}", foundJS, foundVBS);
                   message = "No scripts in current page";
            e.IsValid = validated;
            e.Message = message;

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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