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28.3 How can I catch the BeforeNavigate2 event?
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This is a known bug. See http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q311298&ID=KB;EN-US;
If you are using the second solution from our FAQ "How can I host a WebBrowser control in a Windows Form" you will not have this problem but if you use the automatically generated wrapper classes see the following solution:
John Cullen posted the following answer in the microsoft.public.dotnet.framework.interop newsgroup.
The problem of the BeforeNavigate2 event not firing in C# applications has been floating around various groups for several months. Microsoft have not yet fixed the problem, although it is documented in the knowledge base. Until they do provide a fix, I suggest the following workaround to the problem which uses the fact the the old Webbrowser_V1 BeforeNavigate event *can* be caught. Note, use of this interface is deprecated, however since there doesn't appear to be any chance of a fix any time soon...
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// define the webbrowser object
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private AxSHDocVw.AxWebBrowser axDocument;
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// define an IE3 compatible webbrowser object.
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private SHDocVw.WebBrowser_V1 axDocumentV1;
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axDocument.Navigate("about:blank", ref o, ref o, ref o, ref o);
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object oOcx = axDocument.GetOcx();
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axDocumentV1 = oOcx as WebBrowser_V1;
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axDocumentV1.BeforeNavigate += new SHDocVw.DWebBrowserEvents_BeforeNavigateEventHandler(this.axDocumentV1_BeforeNavigate);
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// ignore errors. If it doesn't work, there's not a lot to do!
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Console.WriteLine("Add BeforeNavigate event handler failed with{0}.", ex.Message);
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private void axDocumentV1_BeforeNavigate(string URL, int Flags, string TargetFrameName, ref object PostData, string Headers, ref bool Processed)
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Console.WriteLine("BeforeNavigateURL= {0}", URL);
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//false= allow navigate to continue.
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//true= cancel navigation.
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