【三】C# 基于WPF 使用CefSharp来做万能爬虫

最新推荐文章于 2025-06-20 09:16:44 发布

dotnet_Monkey

最新推荐文章于 2025-06-20 09:16:44 发布

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分类专栏： WPF CefSharp 文章标签： CefSharp wpf

本文链接：https://blog.youkuaiyun.com/qq_38762313/article/details/93490702

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博客介绍了C#基于WPF使用CefSharp做万能爬虫，还扩展了一个可设置代理的httpClient访问辅助类，同时分享了对CefSharpWebrowser的操作类，并给出使用示例。

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using CefSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ChromeControler
{
    /// <summary>
    /// 对CefSharpWebBrowser的操作类
    /// </summary>
    public static class CefWebBrowserControl
    {

        /// <summary>
        /// 获取html内容
        /// </summary>
        /// <param name="chromiumWebBrowser">CefSharp的webbrowser</param>
        /// <returns></returns>
        public static async Task<string> GetHtmlSource(CefSharp.Wpf.ChromiumWebBrowser chromiumWebBrowser)
        {
            string htmlStr = string.Empty;
            await chromiumWebBrowser.GetSourceAsync().ContinueWith(taskHtml =>
            {
                htmlStr = taskHtml.Result;
            });
            return htmlStr;
        }

        /// <summary>
        /// 给input赋值
        /// </summary>
        /// <param name="chromiumWebBrowser">CefSharp的webbrowser</param>
        /// <param name="id">根据id</param>
        public static string SetValueById(CefSharp.Wpf.ChromiumWebBrowser chromiumWebBrowser, string id,string value)
        {
            if (id.Length > 0)
            {
                string js = @"(
                            function()
                            {
                                var ele= document.getElementById('" + id + @"');
                                if(ele!=null)
                                {
                                    ele.value='"+value+@"';
                                }
                            }
                           )()";
                ExecuteJs(chromiumWebBrowser, js);
                return "赋值成功";
            }
            else
                return "id不能为空";
        }

        /// <summary>
        /// 给Input赋值
        /// </summary>
        /// <param name="chromiumWebBrowser">CefSharp的webbrowser</param>
        /// <param name="name">根据控件的名称</param>
        /// <param name="innerHtml">内部html包含***</param>
        /// <param name="outHtml">外部html包含***</param>
        public static string SetValueByName(CefSharp.Wpf.ChromiumWebBrowser chromiumWebBrowser, string name,string value, SearchType searchType = SearchType.ControlName, string innerHtml = "", string outHtml = "")
        {
            string js = string.Empty;
            string forStr = string.Empty;
            if (name.Length > 0)
            {
                if (innerHtml.Length > 0)
                {
                    forStr = "if(eleAug[i].innerText.indexOf('" + innerHtml + "') != -1) ";

                }
                if (outHtml.Length > 0)
                {
                    forStr = "if(eleAug[i].outerText.indexOf('" + outHtml + "') != -1) ";

                }
                string searchjs = string.Empty;
                switch (searchType)
                {
                    case SearchType.ControlName: { searchjs = " var eleAug= document.getElementsByName('" + name + @"');"; } break;
                    case SearchType.ClassName: { searchjs = " var eleAug= document.getElementsByClassName('" + name + @"');"; } break;
                    case SearchType.TagName: { searchjs = " var eleAug= document.getElementsByTagName('" + name + @"');"; } break;
                }
                js = @"(
                            function()
                            {
                               " + searchjs + @"
                                if(eleAug!=null)
                                {
                                    for(var i=0;i< eleAug.length;i++)
                                    {                                    
                                        " + forStr + @"
                                            { ele.value='" + value + @"';}
                                    }
                                }
                            }
                           )()";
            }
            else
            {
                return "名称不能为空";
            }
            ExecuteJs(chromiumWebBrowser, js);
            return "点击成功";
        }


        /// <summary>
        /// 点击按钮
        /// </summary>
        /// <param name="chromiumWebBrowser">CefSharp的webbrowser</param>
        /// <param name="id">根据id</param>
        public static string ClickButtonById(CefSharp.Wpf.ChromiumWebBrowser chromiumWebBrowser, string id)
        {
            if (id.Length > 0)
            {
                string js = @"(
                            function()
                            {
                                var ele= document.getElementById('" + id + @"');
                                if(ele!=null)
                                {
                                    ele.click();
                                }
                            }
                           )()";
                ExecuteJs(chromiumWebBrowser, js);
                return "点击成功";
            }
            else
                return "id不能为空";
        }

        /// <summary>
        /// 点击按钮
        /// </summary>
        /// <param name="chromiumWebBrowser">CefSharp的webbrowser</param>
        /// <param name="name">根据控件的名称</param>
        /// <param name="innerHtml">内部html包含***</param>
        /// <param name="outHtml">外部html包含***</param>
        public static string ClickButtonByName(CefSharp.Wpf.ChromiumWebBrowser chromiumWebBrowser,  string name, SearchType searchType = SearchType.ControlName, string innerHtml = "", string outHtml = "")
        {
            string js = string.Empty;
            string forStr = string.Empty;
            if (name.Length > 0)
            {
                if (innerHtml.Length > 0)
                {
                    forStr = "if(eleAug[i].innerText.indexOf('" + innerHtml + "') != -1) ";

                }
                if (outHtml.Length > 0)
                {
                    forStr = "if(eleAug[i].outerText.indexOf('" + outHtml + "') != -1) ";

                }
                string searchjs = string.Empty;
                switch (searchType)
                {
                    case SearchType.ControlName: { searchjs = " var eleAug= document.getElementsByName('" + name + @"');"; } break;
                    case SearchType.ClassName: { searchjs = " var eleAug= document.getElementsByClassName('" + name + @"');"; } break;
                    case SearchType.TagName: { searchjs = " var eleAug= document.getElementsByTagName('" + name + @"');"; } break;
                }
                js = @"(
                            function()
                            {
                               " + searchjs + @"
                                if(eleAug!=null)
                                {
                                    for(var i=0;i< eleAug.length;i++)
                                    {                                    
                                        " + forStr + @"
                                            { eleAug[i].click();}
                                    }
                                }
                            }
                           )()";
            }
            else
            {
                return "名称不能为空";
            }
            ExecuteJs(chromiumWebBrowser, js);
            return "点击成功";
        }

        /// <summary>
        /// 执行JS
        /// </summary>
        /// <param name="chromiumWebBrowser">wpf版本的ChromiumWebBrowser</param>
        /// <param name="js"></param>
        public static void ExecuteJs(CefSharp.Wpf.ChromiumWebBrowser chromiumWebBrowser, string js)
        {
            var frame = chromiumWebBrowser.WebBrowser.GetMainFrame();
            frame.EvaluateScriptAsync(js);
        }
    }
    public enum SearchType
    {
        ControlName,
        ClassName,
        TagName

    }
}

使用示例：

CefWebBrowserControl.SetValueById(chromiumWebBrowser, "kw", "万能爬虫");
CefWebBrowserControl.ClickButtonById(chromiumWebBrowser, "su");
CefWebBrowserControl.ClickButtonByName(chromiumWebBrowser, "n", SearchType.ClassName, "下一页>");