.NET WebBrowser - FireBug 样式检查 HTML 元素

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【中文标题】.NET WebBrowser - FireBug 样式检查 HTML 元素【英文标题】:.NET WebBrowser - FireBug Style Inspect HTML Element 【发布时间】:2012-03-19 03:59:05 【问题描述】:

是否可以使用 .NET 3.5/4.0 在 WinForm Web 浏览器中检查 html 元素?

可能使用 IHighlightRenderingServices 接口或 Html Agility Pack?

我希望应用程序像 FireBug 一样运行:

只需将鼠标悬停在要检查的元素上并单击即可。在 1.7 之前的 Firebug 版本中,这会自动切换到 HTML 面板并在节点视图中选择适当的元素。

编辑:

哇,我刚遇到http://www.selectorgadget.com/,这正是我想要做的。它是用 javascript 编写的,在查看了过去 2 小时的源代码后,我仍然不知道如何将它合并到我的程序中......

据我所知,它使用 DOM 元素的标记化和递归分析来找出 CSS 选择器路径:http://www.selectorgadget.com/stable/lib/dom.js。

编辑:好的!我已将 selectorgadget 加载到我的应用程序中。它允许您选择与 Firebug 完全相同的 HTML 元素!甚至创建 Xpath 查询。

但是,我正在使用 AxWebBrowser,但我不知道如何让它与 HtmlAgilityPack 一起使用...

    private void xpathQuery_Click(object sender, EventArgs e)
    
        // Load Browser 
        HtmlWindow window = axWebBrowser1.Document.Window; // <---- 'object' does not contain a definition for 'Window'

        string str = window.Document.Body.OuterHtml;

        // Load HTML
        HtmlAgilityPack.HtmlDocument HtmlDoc = new HtmlAgilityPack.HtmlDocument();
        HtmlDoc.LoadHtml(str);

        //Process Xpath Query 
        HtmlAgilityPack.HtmlNodeCollection Nodes = HtmlDoc.DocumentNode.SelectNodes(xpathText.Text);

        //Print in Text box 
        foreach (HtmlAgilityPack.HtmlNode Node in Nodes)
        
            richTextBox1.Text += Node.OuterHtml + "\r\n";
                 
    

编辑: 我无法让 AxWebBrowser 与 HtmlAgilityPack 一起使用,所以我只是使用 WebClient 类来加载 URL,然后使用 HtmlAgilityPack 对其进行解析。

我即将完成 Web Scraper。它的功能类似于 Visual Web Ripper 以及其他价格超过 1,000 美元的产品。

【问题讨论】:

我可以有你的代码示例吗? 我也需要一个示例代码。谢谢! 【参考方案1】:

其实我以前也做过。您必须将文档转换为IExpando,然后您可以对其进行反射调用以获取成员。我实际上创建了一个DynamicNode 类,它允许您使用动态关键字与文档进行交互。

不过,您可能想使用 mshtml COM 对象:Reusing MSHTML

    在 COM 引用列表中添加对 mshtml 的引用 创建var document = new mshtml.HTMLDocument(); 的实例 投射到 IExpando:var window = (IExpando)document.parentWindow; 创建动态对象包装器(见下文) 使用动态关键字与文档进行交互。

例如这里是我的动态节点:

class DynamicNode : DynamicObject, IExpando, IEnumerable

    private IExpando value;

    public DynamicNode(IExpando value)
    
        this.value = value;
    

    public override bool TryUnaryOperation(UnaryOperationBinder binder, out object result)
    
        switch (binder.Operation)
        
            case System.Linq.Expressions.ExpressionType.Convert:
            case System.Linq.Expressions.ExpressionType.ConvertChecked:
                result = this.value;
                return true;
        

        return base.TryUnaryOperation(binder, out result);
    

    public override IEnumerable<string> GetDynamicMemberNames()
    
        return this.value
            .GetMembers(BindingFlags.Instance | BindingFlags.Public)
            .Select(m => m.Name)
            .Distinct()
            .ToArray();
    

    public override bool TryConvert(ConvertBinder binder, out object result)
    
        result = this.value;
        return true;
    

    public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
    
        if (indexes.Length == 1)
        
            var memberName = indexes[0].ToString();
            result = ReflectionHelpers.GetValue(this.value, memberName);
            result = DynamicNode.Wrap(result);
            return true;
        

        return base.TryGetIndex(binder, indexes, out result);
    

    public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)
    
        if (indexes.Length == 1)
        
            var memberName = indexes[0].ToString();
            value = DynamicNode.Unwrap(value);
            ReflectionHelpers.SetValue(this.value, memberName, value);
            return true;
        

        return base.TrySetIndex(binder, indexes, value);
    

    public override bool TryGetMember(GetMemberBinder binder, out object result)
    
        if (base.TryGetMember(binder, out result))
            return true;

        result = ReflectionHelpers.GetValue(this.value, binder.Name);
        result = DynamicNode.Wrap(result);
        return true;
    

    public override bool TrySetMember(SetMemberBinder binder, object value)
    
        ReflectionHelpers.SetValue(this.value, binder.Name, value);
        return true;
    

    public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
    
        if (binder.Name == "New")
        
            var constructorArgs = new object[args.Length - 1];
            Array.ConstrainedCopy(args, 1, constructorArgs, 0, constructorArgs.Length);

            result = ReflectionHelpers.New(this.value, (string)args[0], constructorArgs);
        
        else
        
            result = ReflectionHelpers.Invoke(this.value, binder.Name, args);
        

        result = DynamicNode.Wrap(result);
        return true;
    

    public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
    
        IExpando self = this.value;
        object[] constructorArgs = new object[0];

        if (args.Length > 0)
        
            self = (IExpando)DynamicNode.Unwrap(args[0]);
            constructorArgs = new object[args.Length - 1];
            Array.ConstrainedCopy(args, 1, constructorArgs, 0, constructorArgs.Length);
        

        result = ReflectionHelpers.Call(this.value, self, constructorArgs);
        result = DynamicNode.Wrap(result);
        return true;
    

    private static object Wrap(object value)
    
        if (value != null && Marshal.IsComObject(value))
            value = new DynamicNode((IExpando)value);

        return value;
    

    public static object Unwrap(object value)
    
        DynamicNode node = value as DynamicNode;
        if (node != null)
            return node.value;

        return value;
    

    public IEnumerator GetEnumerator()
    
        var members = this.value.GetProperties(BindingFlags.Public | BindingFlags.Instance);

        var indexProperties = new List<Tuple<int, PropertyInfo>>();
        var isArray = true;
        foreach (var member in members)
        
            int value = 0;
            if (!int.TryParse(member.Name, out value))
            
                isArray = false;
                break;
            

            var propertyMember = member as PropertyInfo;
            if (propertyMember != null)
                indexProperties.Add(Tuple.Create(value, propertyMember));
        

        if (isArray)
        
            indexProperties.Sort((left, right) => left.Item1.CompareTo(right.Item1));
            foreach (var prop in indexProperties)
                yield return prop.Item2.GetValue(this.value, null);
        
        else
        
            foreach (var member in members)
                yield return member.Name;
        
    

    #region IExpando
    FieldInfo IExpando.AddField(string name)
    
        return this.value.AddField(name);
    

    MethodInfo IExpando.AddMethod(string name, Delegate method)
    
        return this.value.AddMethod(name, method);
    

    PropertyInfo IExpando.AddProperty(string name)
    
        return this.value.AddProperty(name);
    

    void IExpando.RemoveMember(MemberInfo m)
    
        this.value.RemoveMember(m);
    

    FieldInfo IReflect.GetField(string name, BindingFlags bindingAttr)
    
        return this.value.GetField(name, bindingAttr);
    

    FieldInfo[] IReflect.GetFields(BindingFlags bindingAttr)
    
        return this.value.GetFields(bindingAttr);
    

    MemberInfo[] IReflect.GetMember(string name, BindingFlags bindingAttr)
    
        return this.value.GetMember(name, bindingAttr);
    

    MemberInfo[] IReflect.GetMembers(BindingFlags bindingAttr)
    
        return this.value.GetMembers(bindingAttr);
    

    MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr)
    
        return this.value.GetMethod(name, bindingAttr);
    

    MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers)
    
        return this.value.GetMethod(name, bindingAttr, binder, types, modifiers);
    

    MethodInfo[] IReflect.GetMethods(BindingFlags bindingAttr)
    
        return this.value.GetMethods(bindingAttr);
    

    PropertyInfo[] IReflect.GetProperties(BindingFlags bindingAttr)
    
        return this.value.GetProperties(bindingAttr);
    

    PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers)
    
        return this.value.GetProperty(name, bindingAttr, binder, returnType, types, modifiers);
    

    PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr)
    
        return this.value.GetProperty(name, bindingAttr);
    

    object IReflect.InvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target, object[] args, ParameterModifier[] modifiers, System.Globalization.CultureInfo culture, string[] namedParameters)
    
        return this.value.InvokeMember(name, invokeAttr, binder, target, args, modifiers, culture, namedParameters);
    

    Type IReflect.UnderlyingSystemType
    
        get  return this.value.UnderlyingSystemType; 
    
    #endregion


[ComVisible(true)]
public class ScriptObject : IReflect, IExpando

    private readonly Type type;
    private dynamic _constructor;
    private dynamic _prototype;

    public ScriptObject()
    
        type = this.GetType();
    

    [DispId(0)]
    protected virtual object Invoke(object[] args)
    
        return "ClrObject";
    

    public dynamic constructor
    
        get  return _constructor; 
        set  this._constructor = value; 
    

    public dynamic prototype
    
        get  return _prototype; 
        set  this._prototype = value; 
    

    public string toString()
    
        return "ClrObject";
    

    #region IReflect Members
    MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers)
    
        return type.GetMethod(name, bindingAttr, binder, types, modifiers);
    

    MethodInfo IReflect.GetMethod(string name, BindingFlags bindingAttr)
    
        return type.GetMethod(name, bindingAttr);
    

    protected virtual MethodInfo[] GetMethods(BindingFlags bindingAttr)
    
        return type.GetMethods(bindingAttr);
    

    MethodInfo[] IReflect.GetMethods(BindingFlags bindingAttr)
    
        return GetMethods(bindingAttr);
    

    FieldInfo IReflect.GetField(string name, BindingFlags bindingAttr)
    
        return type.GetField(name, bindingAttr);
    

    FieldInfo[] IReflect.GetFields(BindingFlags bindingAttr)
    
        return new FieldInfo[0]; // type.GetFields(bindingAttr);
    

    PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr)
    
        return type.GetProperty(name, bindingAttr);
    

    PropertyInfo IReflect.GetProperty(string name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers)
    
        return type.GetProperty(name, bindingAttr, binder, returnType, types, modifiers);
    

    protected virtual PropertyInfo[] GetProperties(BindingFlags bindingAttr)
    
        return type.GetProperties(bindingAttr);
    

    PropertyInfo[] IReflect.GetProperties(BindingFlags bindingAttr)
    
        return GetProperties(bindingAttr);
    

    MemberInfo[] IReflect.GetMember(string name, BindingFlags bindingAttr)
    
        return type.GetMember(name, bindingAttr);
    

    MemberInfo[] IReflect.GetMembers(BindingFlags bindingAttr)
    
        return type.GetMembers(bindingAttr);
    

    protected virtual object InvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target, object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] namedParameters)
    
        if (name == "[DISPID=0]")
        
            return this.Invoke(args);
        
        return type.InvokeMember(name, invokeAttr, binder, target, args, modifiers, culture, namedParameters);
    

    object IReflect.InvokeMember(string name, BindingFlags invokeAttr, Binder binder, object target, object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] namedParameters)
    
        return this.InvokeMember(name, invokeAttr, binder, target, args, modifiers, culture, namedParameters);
    

    Type IReflect.UnderlyingSystemType
    
        get  return type.UnderlyingSystemType; 
    
    #endregion

    #region IExpando Members
    public FieldInfo AddField(string name)
    
        throw new NotImplementedException();
    

    public MethodInfo AddMethod(string name, Delegate method)
    
        throw new NotImplementedException();
    

    public PropertyInfo AddProperty(string name)
    
        throw new NotImplementedException();
    

    public void RemoveMember(MemberInfo m)
    
        throw new NotImplementedException();
    
    #endregion


public static class ReflectionHelpers

    private const BindingFlags DefaultFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;

    public static object New(this IExpando scope, string functionName, params object[] args)
    
        var constructor = (IExpando)scope.GetValue(functionName);
        var proto = constructor.GetValue("prototype");

        var obj = (IExpando)scope.GetValue("Object");
        var instance = (IExpando)obj.Invoke("create", new object[]  proto );
        Call(constructor, instance, args);

        return instance;
    

    public static object Call(this IExpando function, IExpando scope, params object[] args)
    
        object[] callArgs = new object[args.Length + 1];
        callArgs[0] = scope;
        Array.Copy(args, 0, callArgs, 1, args.Length);

        return Invoke(function, "call", callArgs);
    

    public static void SetValue(this IExpando instance, string propertyName, object value)
    
        if (instance == null)
            throw new ArgumentNullException("instance");

        if (string.IsNullOrEmpty(propertyName))
            throw new ArgumentException("Must specify a value.", "propertyName");

        Invoke(instance, propertyName, InvokeFlags.DISPATCH_PROPERTYPUT, new object[]  value );
    

    public static object GetValue(this IExpando instance, string propertyName)
    
        return Invoke(instance, propertyName, InvokeFlags.DISPATCH_PROPERTYGET, new object[0]);
    

    public static object Invoke(this IExpando instance, string functionName, object[] args)
    
        if (instance == null)
            throw new ArgumentNullException("instance");

        if (string.IsNullOrEmpty(functionName))
            throw new ArgumentException("Must specify a value.", "functionName");

        return Invoke(instance, functionName, InvokeFlags.DISPATCH_METHOD, args);

    

    private static object Invoke(IExpando instance, string functionName, InvokeFlags flags, object[] args)
    
        try
        
            args = args.Select(arg => DynamicNode.Unwrap(arg)).ToArray();
            switch (flags)
            
                case InvokeFlags.DISPATCH_METHOD:
                    var method = instance.GetMethod(functionName, DefaultFlags);
                    return method.Invoke(instance, args);
                case InvokeFlags.DISPATCH_PROPERTYGET:
                    var getProp = instance.GetProperty(functionName, DefaultFlags);
                    return getProp.GetValue(instance, null);
                case InvokeFlags.DISPATCH_PROPERTYPUT:
                case InvokeFlags.DISPATCH_PROPERTYPUTREF:
                    var setProp = instance.GetProperty(functionName, DefaultFlags);
                    if (setProp == null)
                        setProp = instance.AddProperty(functionName);
                    setProp.SetValue(instance, args[0], null);
                    return null;
                default:
                    throw new NotSupportedException();
            
        
        catch (COMException comex)
        
            switch ((uint)comex.ErrorCode)
            
                // Unexpected script error. This will be handled by the IProcess.UnhandledException event
                case 0x80020101:
                    return null;
                default:
                    throw;
            
        
    

    private enum InvokeFlags
    
        DISPATCH_METHOD = 1,
        DISPATCH_PROPERTYGET = 2,
        DISPATCH_PROPERTYPUT = 4,
        DISPATCH_PROPERTYPUTREF = 8,
    

您实际上可以通过这种方式将 .net 对象粘贴到文档中,或者从 .net 中取出对象并与它们进行交互。您还可以将 js 评估为字符串并将其调用到 .net 函数中。下面是一些代码sn-ps的用法:

获取和设置 js 对象的成员:

this.host.Window.eval(@" Foo =  ; ");

var foo = this.host.Window.Foo;
foo.B = 7.11;
Assert.Equal(7.11, foo.B);

从 C# 调用 js 函数:

this.host.eval("function add(x, y)  return x + y; ");
var z = (int)this.host.Window.add(7, 11);
Assert.Equal(7 + 11, z);

将 .net 对象插入文档并从 js 调用其成员:

this.host.Window.Custom2 = new Custom2();    
this.host.Window.eval(@"
  function test() 
    return Custom2.Test().Value;
  ");

bool success = this.host.Window.test();
Assert.True(success);

您只能将继承自 ScriptObject 的对象粘贴到文档中(在上面的代码块中定义)。好吧,我认为您可以将任何东西放在那里,但是如果它们不实现 IReflect,您会得到奇怪的行为。

【讨论】:

【参考方案2】:

您可以使用 Firebug lite,它的功能与原来的 Firebug 非常相似。

【讨论】:

【参考方案3】:

我认为你不能用 HtmlAgillity 包做到这一点。我这么认为的原因是浏览器内存中发生了很多事情(例如,由于 javascript)。因此,您会错过在某些 JavaScript 的结果中呈现的所有元素。 您也不会看到通过 JS 动态应用的样式。

您最好的方法可能是使用 mshtml(在 Google 上搜索 Microsoft HTML、mshtml)并在 Document_Loaded 事件中继续迭代文档中的所有元素,将鼠标悬停在 javascript 上以突出显示它们。然后,您可以通过在 DOM 中找到当前突出显示的元素(它将具有某种“选定的”css 类或您应用的某些特定边框属性)并迭代其属性以检查它。

【讨论】:

【参考方案4】:

firebug lite 怎么样?

http://getfirebug.com/firebuglite

这是一个小书签,可以将大多数萤火虫功能注入任何东西。

【讨论】:

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