图像 alt 标签 – 使用 C# 检查

Install-Package Aspose.HTML

using Aspose.Html;
using Aspose.Html.Accessibility;
using Aspose.Html.Accessibility.Results;
...

    // Prepare a path to a source HTML file
    string documentPath = Path.Combine(DataDir, "test-checker.html");

    // Initialize webaccessibility container
    var webAccessibility = new WebAccessibility();

    // Get from the rules list Principle "1. Perceivable" by code "1" and get guideline "1.1 Text Alternatives"
    var guideline = webAccessibility.Rules.GetPrinciple("1").GetGuideline("1.1");

    // Create an accessibility validator – pass the found guideline as parameters and specify the full validation settings
    var validator = webAccessibility.CreateValidator(guideline, ValidationBuilder.All);

    // Initialize an HTMLDocument object
    using (var document = new HTMLDocument(documentPath))
    {
        var validationResult = validator.Validate(document);
        if (!validationResult.Success)
        {
            // Get all the result details 
            foreach (var ruleResult in validationResult.Details)
            {
                // If the result of the rule is unsuccessful
                if (!ruleResult.Success)
                {
                    // Get errors list
                    foreach (var result in ruleResult.Errors)
                    {
                        // Check the type of the erroneous element, in this case, we have an error in the HTML Element
                        if (result.Error.Target.TargetType == TargetTypes.HTMLElement)
                        {
                            var rule = (HTMLElement)result.Error.Target.Item;
                            Console.WriteLine("Error in rule {0} : {1}", result.Rule.Code, result.Error.ErrorMessage);
                            Console.WriteLine("HTML Element: {0}", rule.OuterHTML);
                        }
                    }
                }
            }
        }
    }