使用WPF浏览器控件时，如何才能使用BeforeNavigate2？

据我所知，WPF的Brwoser控件是ie-Active-X控件的包装器。 后者有一个BeforeNavigate2方法，而我在WPF WebBrowser控件中找不到它。 有没有办法可以解决这个问题？

谢谢！ 渣

Answer 1

是。 WPF的WebBrowser控件实际上是脑死亡。 最重要的是它甚至是密封的。

您必须使用Windows.Forms的WebBrowser控件并将其嵌入WindowsFormsHost中。

此外，您必须从WebBrowser派生一个类并在其中执行一些COM魔术。

像这样制作一个UserControl：

然后像这样修改Windows.Forms WebBrowser：

 using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Security.Permissions; using System.Windows.Forms; namespace MP.Assistant.WpfClient.DialogContentControls { /// Imports the BeforeNavigate2 method from the OLE DWebBrowserEvents2 /// interface. [ComImport] [Guid("34A715A0-6587-11D0-924A-0020AFC7AC4D")] [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] [TypeLibType(TypeLibTypeFlags.FHidden)] public interface DWebBrowserEvents2 { [PreserveSig] [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)] [DispId(250)] void BeforeNavigate2([In] [MarshalAs(UnmanagedType.IDispatch)] object pDisp, [In] [MarshalAs(UnmanagedType.Struct)] ref object URL, [In] [MarshalAs(UnmanagedType.Struct)] ref object Flags, [In] [MarshalAs(UnmanagedType.Struct)] ref object TargetFrameName, [In] [MarshalAs(UnmanagedType.Struct)] ref object PostData, [In] [MarshalAs(UnmanagedType.Struct)] ref object Headers, [In] [Out] ref bool Cancel); } public class ExtendedWinFormsWebBrowser : WebBrowser { // Handles the NavigateError event from the underlying ActiveX // control by raising the NavigateError event defined in this class. AxHost.ConnectionPointCookie cookie; ExtendedWinFormsWebBrowserEventHelper helper; bool renavigating; public ExtendedWinFormsWebBrowser() { AdditionalHeaders = new string[] {}; } public string[] AdditionalHeaders { get; set; } [PermissionSet(SecurityAction.LinkDemand, Name = "FullTrust")] protected override void CreateSink() { base.CreateSink(); // Create an instance of the client that will handle the event // and associate it with the underlying ActiveX control. helper = new ExtendedWinFormsWebBrowserEventHelper(this); cookie = new AxHost.ConnectionPointCookie(ActiveXInstance, helper, typeof (DWebBrowserEvents2)); } [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")] protected override void DetachSink() { // Disconnect the client that handles the event // from the underlying ActiveX control. if (cookie != null) { cookie.Disconnect(); cookie = null; } base.DetachSink(); } void OnBeforeNavigate2(object pDisp, ref object url, ref object flags, ref object targetFrameName, ref object postData, ref object headers, ref bool cancel) { if (!renavigating) { if (AdditionalHeaders.Length > 0) { headers += string.Join("\r\n", AdditionalHeaders) + "\r\n"; renavigating = true; cancel = true; Navigate((string)url, (string)targetFrameName, (byte[])postData, (string)headers); } } else { renavigating = false; } } #region Nested type: ExtendedWinFormsWebBrowserEventHelper class ExtendedWinFormsWebBrowserEventHelper : StandardOleMarshalObject, DWebBrowserEvents2 { readonly ExtendedWinFormsWebBrowser parent; public ExtendedWinFormsWebBrowserEventHelper(ExtendedWinFormsWebBrowser parent) { this.parent = parent; } #region DWebBrowserEvents2 Members public void BeforeNavigate2(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel) { parent.OnBeforeNavigate2(pDisp, ref URL, ref Flags, ref TargetFrameName, ref PostData, ref Headers, ref Cancel); } #endregion } #endregion } } 

然后从代码隐藏中使用WebBrowser（在XAML中命名为WebBrowser），并为AdditionalHeaders提供所需的值。