CefSharp禁止弹出新窗体，在同一窗口打开链接，或者在新Tab页打开链接，并且支持带type="POST" target="_blank"的链接

说明：在同一窗口打开链接，只要稍加改造就可以实现，这里实现的是在新Tab页打开链接，并且支持带type="POST" target="_blank"的链接

github和bitbucket上相关问题：

1、WPF empty POST data when using custom popup    https://github.com/cefsharp/CefSharp/issues/1267

2、CefLifeSpanHandler, customized OnBeforePopup problem    https://bitbucket.org/chromiumembedded/cef/issues/1949/

解决(CefSharp版本75.1.143.0)：

一、实现IRequestHandler接口

using CefSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography.X509Certificates;

namespace CefSharpDemo
{
    public class RequestHandler : IRequestHandler
    {
        private ExtChromiumBrowser _browser;

        public RequestHandler(ExtChromiumBrowser browser)
        {
            _browser = browser;
        }

        public bool GetAuthCredentials(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback)
        {
            return false;
        }

        public IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
        {
            if (request.Method.ToUpper() == "POST" && request.PostData != null)
            {
                if (request.PostData.Elements.Count > )
                {
                    _browser.PostData = new byte[request.PostData.Elements[].Bytes.Length];
                    request.PostData.Elements[].Bytes.CopyTo(_browser.PostData, );
                }
            }
            return null;
        }

        public bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool userGesture, bool isRedirect)
        {
            return false;
        }

        public bool OnCertificateError(IWebBrowser chromiumWebBrowser, IBrowser browser, CefErrorCode errorCode, string requestUrl, ISslInfo sslInfo, IRequestCallback callback)
        {
            return false;
        }

        public bool OnOpenUrlFromTab(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, string targetUrl, WindowOpenDisposition targetDisposition, bool userGesture)
        {
            return false;
        }

        public void OnPluginCrashed(IWebBrowser chromiumWebBrowser, IBrowser browser, string pluginPath)
        {

        }

        public bool OnQuotaRequest(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, long newSize, IRequestCallback callback)
        {
            return false;
        }

        public void OnRenderProcessTerminated(IWebBrowser chromiumWebBrowser, IBrowser browser, CefTerminationStatus status)
        {

        }

        public void OnRenderViewReady(IWebBrowser chromiumWebBrowser, IBrowser browser)
        {

        }

        public bool OnSelectClientCertificate(IWebBrowser chromiumWebBrowser, IBrowser browser, bool isProxy, string host, int port, X509Certificate2Collection certificates, ISelectClientCertificateCallback callback)
        {
            return false;
        }
    }
}

二、实现ILifeSpanHandler接口

using CefSharp;
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Interop;
using Utils;

namespace CefSharpDemo
{
    public class CefLifeSpanHandler : CefSharp.ILifeSpanHandler
    {
        private static LimitedTaskScheduler _scheduler = new LimitedTaskScheduler();

        public CefLifeSpanHandler()
        {

        }

        public bool DoClose(IWebBrowser browserControl, CefSharp.IBrowser browser)
        {
            if (browser.IsDisposed || browser.IsPopup)
            {
                return false;
            }

            return true;
        }

        public void OnAfterCreated(IWebBrowser browserControl, IBrowser browser)
        {

        }

        public void OnBeforeClose(IWebBrowser browserControl, IBrowser browser)
        {
        }

        public bool OnBeforePopup(IWebBrowser browserControl, IBrowser browser, IFrame frame, string targetUrl, string targetFrameName, WindowOpenDisposition targetDisposition, bool userGesture, IPopupFeatures popupFeatures, IWindowInfo windowInfo, IBrowserSettings browserSettings, ref bool noJavascriptAccess, out IWebBrowser newBrowser)
        {
            var chromiumWebBrowser = (ExtChromiumBrowser)browserControl;

            chromiumWebBrowser.Dispatcher.Invoke(new Action(() =>
            {
                BrowserPopupWin win = new BrowserPopupWin();
                win.ShowInTaskbar = false;
                win.Height = ;
                win.Width = ;
                win.Show();

                IntPtr handle = new WindowInteropHelper(win).Handle;
                windowInfo.SetAsChild(handle);

                _scheduler.Run(() =>
                {
                    WaitUtil.Wait(() => chromiumWebBrowser.PostData);

                    IRequest request = null;
                    if (chromiumWebBrowser.PostData != null)
                    {
                        request = frame.CreateRequest();
                        request.Url = targetUrl;
                        request.Method = "POST";

                        request.InitializePostData();
                        var element = request.PostData.CreatePostDataElement();
                        element.Bytes = chromiumWebBrowser.PostData;
                        request.PostData.AddElement(element);
                        chromiumWebBrowser.PostData = null;
                    }

                    chromiumWebBrowser.Dispatcher.Invoke(new Action(() =>
                    {
                        NewWindowEventArgs e = new NewWindowEventArgs(targetUrl, request);
                        chromiumWebBrowser.OnNewWindow(e);
                    }));

                    chromiumWebBrowser.Dispatcher.Invoke(new Action(() =>
                    {
                        win.Close();
                    }));
                });
            }));

            newBrowser = null;
            return false;
        }

    }
}

三、扩展ChromiumWebBrowser

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

namespace CefSharpDemo
{
    public class ExtChromiumBrowser : ChromiumWebBrowser
    {
        public byte[] PostData { get; set; }

        public ExtChromiumBrowser()
            : base()
        {
            this.LifeSpanHandler = new CefLifeSpanHandler();
            this.DownloadHandler = new DownloadHandler(this);
            this.MenuHandler = new MenuHandler();
            this.KeyboardHandler = new KeyboardHandler();
            this.RequestHandler = new RequestHandler(this);
        }

        public event EventHandler<NewWindowEventArgs> StartNewWindow;

        public void OnNewWindow(NewWindowEventArgs e)
        {
            if (StartNewWindow != null)
            {
                StartNewWindow(this, e);
            }
        }

        public void ClearHandlers()
        {
            //如果不清理Handler，会导致子进程CefSharp.BrowserSubprocess.exe无法释放
            this.LifeSpanHandler = null;
            this.DownloadHandler = null;
            this.MenuHandler = null;
            this.KeyboardHandler = null;
        }
    }
}

四、封装ExtChromiumBrowser(BrowserCtrl控件)

using CefSharp;
using CefSharp.Wpf;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Utils;

namespace CefSharpDemo
{
    /// <summary>
    /// 浏览器用户控件
    /// </summary>
    public partial class BrowserCtrl : UserControl, IDisposable
    {
        #region 外部方法
        /*
        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);
        [DllImport("user32.dll", SetLastError = true)]
        public static extern int MoveWindow(IntPtr hWnd, int x, int y, int nWidth, int nHeight, bool BRePaint);
        [DllImport("user32.dll", SetLastError = true)]
        public static extern int CloseWindow(IntPtr hWnd);
        [DllImport("User32.dll", EntryPoint = "GetWindowText")]
        private static extern int GetWindowText(IntPtr hwnd, StringBuilder lpString, int nMaxCount);
        */
        #endregion

        #region 变量属性事件
        private static bool _isCefInited = false;

        private static object _lockObject = new object();

        private JSObject _jsObject;

        private bool _firstLoad = true;

        /// <summary>
        /// 在此事件中设置URL(此事件已在线程中执行，此事件已对错误情况进行处理)
        /// </summary>
        public event EventHandler SetUrlEvent;

        /// <summary>
        /// URL
        /// </summary>
        public string Url { get; set; }

        public IRequest Request { get; set; }

        /// <summary>
        /// 浏览器FrameLoadEnd事件
        /// </summary>
        public event EventHandler FrameLoadEnd;

        private ExtChromiumBrowser _browser;

        public ExtChromiumBrowser Browser
        {
            get
            {
                WaitUtil.Wait(() => this._browser != null && this._browser.IsInitialized && _isCefInited);

                return this._browser;
            }
        }

        private static LimitedTaskScheduler _scheduler = new LimitedTaskScheduler();
        #endregion

        #region 构造函数
        public BrowserCtrl()
        {
            InitializeComponent();
            if (DesignerProperties.GetIsInDesignMode(this)) return;

            this.Loaded += BrowserCtrl_Loaded;

            lock (_lockObject)
            {
                if (!_isCefInited)
                {
                    _isCefInited = true;
                    InitCef();//初始化CefSharp
                }
            }

            _browser = new ExtChromiumBrowser();
            BindBrowser(_browser);
            grid.Children.Add(_browser);
        }
        #endregion

        #region BrowserCtrl_Loaded
        private void BrowserCtrl_Loaded(object sender, RoutedEventArgs e)
        {

        }
        #endregion

        #region SetMapCtrl
        /// <summary>
        /// 设置Map控件接口，用于C#和JS互操作
        /// </summary>
        public void SetMapCtrl(IMapCtrl mapCtrl)
        {
            _jsObject.MapCtrl = mapCtrl;
        }
        #endregion

        #region Dispose 释放资源
        /// <summary>
        /// 释放资源
        /// </summary>
        public void Dispose()
        {
            //如果有弹出窗口则先释放它
            //foreach (UIElement item in grid.Children)
            //{
            //    if (item is BrowserContainer)
            //    {
            //        (item as BrowserContainer).ClearResource();
            //    }
            //}

            _browser.ClearHandlers();
            if (_browser != null && !_browser.IsDisposed)
            {
                _browser.Dispose();
            }
        }
        #endregion

        #region Load
        public void Load(string url)
        {
            if (!string.IsNullOrWhiteSpace(url))
            {
                loadingWait.Visibility = Visibility.Visible;
                Url = url;
                _scheduler.Run(() =>
                {
                    #region Wait
                    WaitUtil.Wait(() =>
                    {
                        if (this._browser == null) return false;
                        if (!this._browser.IsInitialized) return false;
                        if (!_isCefInited) return false;
                        bool isBrowserInitialized = false;
                        this.Dispatcher.Invoke(() =>
                        {
                            isBrowserInitialized = this._browser.IsBrowserInitialized;
                        });
                        if (!isBrowserInitialized) return false;
                        return true;
                    });
                    #endregion

                    _browser.Load(Url);
                });
            }
        }
        #endregion

        #region LoadUrl
        private void LoadUrl()
        {
            if (_firstLoad)
            {
                _firstLoad = false;

                _scheduler.Run(() =>
                {
                    #region Wait
                    WaitUtil.Wait(() =>
                    {
                        if (this._browser == null) return false;
                        if (!this._browser.IsInitialized) return false;
                        if (!_isCefInited) return false;
                        bool isBrowserInitialized = false;
                        this.Dispatcher.Invoke(() =>
                        {
                            isBrowserInitialized = this._browser.IsBrowserInitialized;
                        });
                        if (!isBrowserInitialized) return false;
                        return true;
                    });
                    #endregion

                    if (Url == null && SetUrlEvent != null)
                    {
                        try
                        {
                            SetUrlEvent(this, null);
                        }
                        catch (Exception ex)
                        {
                            LogUtil.Error(ex, "BrowserCtrl LoadUrl error 获取URL失败");
                        }
                    }
                    else
                    {
                        this.Dispatcher.Invoke(new Action(() =>
                        {
                            loadingWait.Visibility = Visibility.Collapsed;
                        }));
                    }

                    if (Url != null)
                    {
                        try
                        {
                            if (Request == null)
                            {
                                _browser.Load(Url);
                            }
                            else
                            {
                                _browser.Load(Url);
                                _browser.GetMainFrame().LoadRequest(Request);
                                Request = null;
                            }
                        }
                        catch (Exception ex)
                        {
                            LogUtil.Error(ex, "BrowserCtrl LoadUrl error Load URL失败");
                        }
                    }
                    else
                    {
                        this.Dispatcher.Invoke(new Action(() =>
                        {
                            loadingWait.Visibility = Visibility.Collapsed;
                        }));
                    }
                });
            }
        }
        #endregion

        #region BindBrowser
        private void BindBrowser(ExtChromiumBrowser browser)
        {
            _jsObject = new JSObject();
            browser.RegisterJsObject("jsObj", _jsObject, new CefSharp.BindingOptions { CamelCaseJavascriptNames = false });

            browser.IsBrowserInitializedChanged += (ss, ee) =>
            {
                LoadUrl();
            };
            browser.FrameLoadStart += (ss, ee) =>
            {
                this.Dispatcher.BeginInvoke(new Action(() =>
                {
                    (ss as ExtChromiumBrowser).Focus();
                }));
            };
            browser.FrameLoadEnd += (ss, ee) =>
            {
                this.Dispatcher.BeginInvoke(new Action(() =>
                {
                    loadingWait.Visibility = Visibility.Collapsed;
                }));
                if (FrameLoadEnd != null)
                {
                    FrameLoadEnd(null, null);
                }
            };
            browser.KeyDown += (ss, ee) =>
            {
                if (ee.Key == Key.F5)
                {
                    try
                    {
                        browser.Reload();
                    }
                    catch (Exception ex)
                    {
                        LogUtil.Error(ex, "ExtChromiumBrowser Reload error");
                    }
                }
            };
            browser.PreviewTextInput += (o, e) =>
            {
                foreach (var character in e.Text)
                {
                    // 把每个字符向浏览器组件发送一遍
                    browser.GetBrowser().GetHost().SendKeyEvent((int)WM.CHAR, (int)character, );
                }

                // 不让cef自己处理
                e.Handled = true;
            };
            browser.LoadError += (s, e) =>
            {
                this.Dispatcher.BeginInvoke(new Action(() =>
                {
                    loadingWait.Visibility = Visibility.Collapsed;
                }));
            };
        }
        #endregion

        #region RegisterJsObject
        public void RegisterJsObject(string name, object objectToBind, BindingOptions options = null)
        {
            try
            {
                if (_browser != null)
                {
                    _browser.RegisterJsObject(name, objectToBind, options);
                }
            }
            catch (Exception ex)
            {
                LogUtil.Error(ex, "BrowserCtrl RegisterJsObject 错误");
            }
        }
        #endregion

        #region 初始化CefSharp
        public static void InitCef()
        {
            string cefsharpFolder = "CefSharp";

            var settings = new CefSettings();
            //The location where cache data will be stored on disk. If empty an in-memory cache will be used for some features and a temporary disk cache for others.
            //HTML5 databases such as localStorage will only persist across sessions if a cache path is specified.
            settings.CachePath = cefsharpFolder + "/cache"; //设置cache目录

            settings.MultiThreadedMessageLoop = true;
            CefSharpSettings.FocusedNodeChangedEnabled = true;
            CefSharpSettings.LegacyJavascriptBindingEnabled = true;
            CefSharpSettings.ShutdownOnExit = true;
            CefSharpSettings.SubprocessExitIfParentProcessClosed = true;

            string logDir = AppDomain.CurrentDomain.BaseDirectory + cefsharpFolder + "/log/";
            if (!Directory.Exists(logDir))
            {
                Directory.CreateDirectory(logDir);
            }

            settings.BrowserSubprocessPath = AppDomain.CurrentDomain.BaseDirectory + cefsharpFolder + "/CefSharp.BrowserSubprocess.exe";
            settings.LogFile = logDir + DateTime.Now.ToString("yyyyMMdd") + ".log";
            settings.LocalesDirPath = AppDomain.CurrentDomain.BaseDirectory + cefsharpFolder + "/locales";
            settings.CefCommandLineArgs.Add("disable-gpu", "");
            settings.CefCommandLineArgs.Add("enable-media-stream", "");

            if (!Cef.Initialize(settings, performDependencyCheck: true, browserProcessHandler: new BrowserProcessHandler()))
            {
                throw new Exception("Unable to Initialize Cef");
            }
        }
        #endregion

    }
}

五、MainWindow测试代码

using CefSharp;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Utils;

namespace CefSharpDemo
{
    /// <summary>
    /// CefSharp Demo 窗体
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            tabControl.AddTabItemEvent += tabControl_AddTabItemEvent;
            Application.Current.MainWindow = this;
        }

        private void tabControl_AddTabItemEvent(object sender, EventArgs e)
        {
            //CreateTabItem("https://www.cnblogs.com/");
            CreateTabItem("file:///D:/_程序/CefSharpDemo/post.html");
        }

        /// <summary>
        /// 新增Tab页
        /// </summary>
        private void CreateTabItem(string url = null, IRequest request = null)
        {
            TabItem tabItem = new TabItem();
            tabItem.Header = "新标签页";
            BrowserDemoCtrl ctrl = new BrowserDemoCtrl();
            ctrl.browserCtrl.Browser.StartNewWindow += (s, e) =>
            {
                CreateTabItem(e.TargetUrl, e.Request);
            };
            ctrl.browserCtrl.SetUrlEvent += (s, e) =>
            {
                ctrl.browserCtrl.Url = url;
                ctrl.browserCtrl.Request = request;
            };
            tabItem.Content = ctrl;
            tabControl.Items.Add(tabItem);
            tabControl.SelectedItem = tabItem;
            ScrollViewer scrollViewer = tabControl.Template.FindName("scrollViewer", tabControl) as ScrollViewer;
            scrollViewer.ScrollToRightEnd();
        }

        private void Window_Closed(object sender, EventArgs e)
        {
            tabControl.CloseAllTabItem(); //关闭窗体清理资源

            //程序退出时删除cache
            CefSharp.Cef.Shutdown();
            string cachePath = AppDomain.CurrentDomain.BaseDirectory + "CefSharp\\cache";
            if (Directory.Exists(cachePath))
            {
                foreach (string path in Directory.GetDirectories(cachePath))
                {
                    Directory.Delete(path, true);
                }
                foreach (string file in Directory.GetFiles(cachePath))
                {
                    if (!file.ToLower().Contains("cookies"))
                    {
                        File.Delete(file);
                    }
                }
            }
        }
    }
}

 六、测试html代码post.html

<!DOCTYPE html>
<html>
<head>
    <title>CefSharpDemo</title>

    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <style type="text/css">
    </style>

    <script type="text/javascript">
    </script>
</head>
<body>
    <!--enctype="multipart/form-data"-->
    <form method="post" action="http://localhost:1209/netcms/" target="_blank">
        <span>name:</span><input type="text" name="name" value="测试名称" />
        <span>code:</span><input type="text" name="code" value="测试编码" />

        <button type="submit">Post提交</button>
    </form>
</body>
</html>

七、测试后台代码

public ActionResult index()
{
    string name = Request.Params["name"];
    string code = Request.Params["code"];

    ViewBag.name = name;
    ViewBag.code = code;

    return View();
}

八、测试前台cshtml代码

@using Models;
@{
    Layout = "~/Views/Shared/_SiteLayout.cshtml";
}

<div style="font-size:50px; height:1200px;">
    <span>name:</span><span>@ViewBag.name</span><br /><span>code:</span><span>@ViewBag.code</span>
</div>

九：关键代码段：

1、RequestHandler类中获取并保存PostData

public IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
{
    if (request.Method.ToUpper() == "POST" && request.PostData != null)
    {
        if (request.PostData.Elements.Count > )
        {
            _browser.PostData = new byte[request.PostData.Elements[].Bytes.Length];
            request.PostData.Elements[].Bytes.CopyTo(_browser.PostData, );
        }
    }
    return null;
}

 2、CefLifeSpanHandler类中创建IRequest

public bool OnBeforePopup(IWebBrowser browserControl, IBrowser browser, IFrame frame, string targetUrl, string targetFrameName, WindowOpenDisposition targetDisposition, bool userGesture, IPopupFeatures popupFeatures, IWindowInfo windowInfo, IBrowserSettings browserSettings, ref bool noJavascriptAccess, out IWebBrowser newBrowser)
{
    var chromiumWebBrowser = (ExtChromiumBrowser)browserControl;

    chromiumWebBrowser.Dispatcher.Invoke(new Action(() =>
    {
        BrowserPopupWin win = new BrowserPopupWin();
        win.ShowInTaskbar = false;
        win.Height = ;
        win.Width = ;
        win.Show();

        IntPtr handle = new WindowInteropHelper(win).Handle;
        windowInfo.SetAsChild(handle);

        _scheduler.Run(() =>
        {
            WaitUtil.Wait(() => chromiumWebBrowser.PostData);

            IRequest request = null;
            if (chromiumWebBrowser.PostData != null)
            {
                request = frame.CreateRequest();
                request.Url = targetUrl;
                request.Method = "POST";

                request.InitializePostData();
                var element = request.PostData.CreatePostDataElement();
                element.Bytes = chromiumWebBrowser.PostData;
                request.PostData.AddElement(element);
                chromiumWebBrowser.PostData = null;
            }

            chromiumWebBrowser.Dispatcher.Invoke(new Action(() =>
            {
                NewWindowEventArgs e = new NewWindowEventArgs(targetUrl, request);
                chromiumWebBrowser.OnNewWindow(e);
            }));

            chromiumWebBrowser.Dispatcher.Invoke(new Action(() =>
            {
                win.Close();
            }));
        });
    }));

    newBrowser = null;
    return false;
}

说明：OnBeforePopup方法要return false，用BrowserPopupWin和windowInfo.SetAsChild方法弹出一个不可见的窗体，这样才能拿到PostData

3、在BrowserCtrl控件中用LoadRequest方法打开新的URL，并把post数据带过去

if (Request == null)
{
    _browser.Load(Url);
}
else
{
    _browser.Load(Url);
    _browser.GetMainFrame().LoadRequest(Request);
    Request = null;
}

 

十、效果图：

完整代码下载：https://files-cdn.cnblogs.com/files/s0611163/CefSharpDemo.zip

源码说明：为了减少源码压缩包的大小，代码中没有依赖的CefSharp文件，请自己下载(使用x86版本)，用于测试的网页后台代码也没有，请自己制作测试后台