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winform的WebBrowser控件，可以方便的载入页面并执行一些操作，我们可以注入自己的js脚本在页面中执行，方法如下：

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];

HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");

IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;

element.text = "function sayHello() { alert('hello') }";

head.AppendChild(scriptEl);

webBrowser1.Document.InvokeScript("sayHello");

另外如果你的脚本非常简单也可以用下面的方法：

string jCode = "alert("Hello");"

// or any combination of your JavaScript commands

// (including function calls, variables... etc)

// WebBrowser webBrowser1 is what you are using for your web browser

webBrowser1.Document.InvokeScript("eval", new object[] { jCode });

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApp4

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

//webBrowser1.ObjectForScripting = this;

}private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)

    {
        webBrowser1.IsScriptingEnabled = true;//启用js函数调用
        //string str = webBrowser1.StringByEvaluatingJavaScriptFromString("test1()");
        richTextBox1.Text = "加载完成";
    }

    private void button1_Click(object sender, EventArgs e)
    {
        //var names = document.querySelectorAll("p.nickname.ng-binding");
        //     var output ="",length = names.length

        //     for(var i=0;i<length;i++){
        //         output += names[i].innerHTML +"\n";
        //     }
        //     console.log(output);
        //     copy(output);
        webBrowser1.IsScriptingEnabled = true;//启用js函数调用
        WebKit.DOM.Document doc = webBrowser1.Document;
        WebKit.DOM.NodeList nodelist = doc.GetElementsByTagName("body");
        WebKit.DOM.Node node = nodelist[0];
        WebKit.DOM.Element ele = webBrowser1.Document.CreateElement("script");
        ele.TextContent = "function sayHello() {return '1213';}";
        //ele.TextContent = "function sayHello() { var names = document.querySelectorAll('p.nickname.ng - binding');var output ='',length = names.length;for(var i=0;i<length;i++){ output += names[i].innerHTML +'\n'; }   return output; }";
        node.AppendChild(ele);
        //获取用户
        WebKit.DOM.NodeList plist = doc.GetElementsByTagName("p");
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < plist.Length; i++)
        {
            //string nodeName = plist[i].NodeName;
            //string nodeValue = plist[i].NodeValue;
            //string localName = plist[i].LocalName;
            //bool isHasChild = plist[i].HasChildNodes;

            string content = plist[i].TextContent;
            //sb.Append("nodeName:"+nodeName+"==nodeVale:"+nodeValue+"==content:"+content+ "==localName:" + localName+ "\nisHasChild:" + isHasChild);
            if (content.Trim().Length == 0 || content == "使用手机微信扫码登录" || content == "网页版微信需要配合手机使用") {
                continue;
            }
            if (content.Contains("山西老乡俱乐部") || content.Contains("天津吃喝玩乐团") || content.Contains("下载微信 PC 版") ||content == "暂时没有新消息" || content == "未选择聊天" || content == "请检查你的网络设置 点击重连" || content == "二维码失效，点击刷新" || content == "请在手机点击确认登录")
            {
                continue;
            }
            if (content == "加载中..."|| content == "暂无文章..." || content == "1:01" || content == "0:06" || content == "请检查你的网络设置 点击重连" || content.Contains("Tencent Inc")|| content == "正在获取最近的聊天...")
            {
                continue;
            }
            sb.Append("\ncontent:" + content);

        }

       string text = webBrowser1.DocumentText;
        bool b = webBrowser1.IsScriptingEnabled;
        //Object obj = webBrowser1.Document.InvokeScriptMethod("document.querySelectorAll('p.nickname.ng - binding')", "");
        Object obj = webBrowser1.Document.InvokeScriptMethod("sayHello",new Object[] { });
        richTextBox1.Text = "按钮点击;" + b + "==" + obj.ToString() + ";"+sb.ToString();//+ nicklist.Length + "=" + nodelist[0].ToString();
    }
}
}
目前能获取到信息，但是想在页面执行javaScript如：
var names = document.querySelectorAll("p.nickname.ng-binding");
var output ="",length = names.length

            for(var i=0;i<length;i++){
             output += names[i].innerHTML +"\n";
           }
         console.log(output);
          copy(output);
会报这个错误：
C# winform 对 COM 组件的调用返回了错误 HRESULT E_FAIL。
希望大家知道这个错误的帮助一下