blocks|key|1299057|text|webBrowser.ScriptErrorsSuppressed+=+true;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1299058|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>webBrowser.ScriptErrorsSuppressed = true;
</code></pre>

blocks|key|1299101|text|axwebbrowser1.Silent+=+true；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1299102|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

blocks|key|1084046|text|这会禁用脚本错误，也会禁用其他窗口。例如NTLM登录窗口或客户端证书接受窗口。下面的代码将只抑制javascript错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084047|//+Hides+script+errors+without+hiding+other+dialog+boxes.
private+void+SuppressScriptErrorsOnly(WebBrowser+browser)
{
++++//+Ensure+that+ScriptErrorsSuppressed+is+set+to+false.
++++browser.ScriptErrorsSuppressed+=+false;

++++//+Handle+DocumentCompleted+to+gain+access+to+the+Document+object.
++++browser.DocumentCompleted+%2B=
++++++++new+WebBrowserDocumentCompletedEventHandler(
++++++++++++browser_DocumentCompleted);
}

private+void+browser_DocumentCompleted(object+sender,+
++++WebBrowserDocumentCompletedEventArgs+e)
{
++++((WebBrowser)sender).Document.Window.Error+%2B=+
++++++++new+HtmlElementErrorEventHandler(Window_Error);
}

private+void+Window_Error(object+sender,+
++++HtmlElementErrorEventArgs+e)
{
++++//+Ignore+the+error+and+suppress+the+error+dialog+box.+
++++e.Handled+=+true;
}|code-block|syntax|javascript|1084048|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This disables the script errors and also disables other windows.. such as the NTLM login window or the client certificate accept window. The below will suppress only javascript errors. 

<pre><code>// Hides script errors without hiding other dialog boxes.
private void SuppressScriptErrorsOnly(WebBrowser browser)
{
 // Ensure that ScriptErrorsSuppressed is set to false.
 browser.ScriptErrorsSuppressed = false;

 // Handle DocumentCompleted to gain access to the Document object.
 browser.DocumentCompleted +=
 new WebBrowserDocumentCompletedEventHandler(
 browser_DocumentCompleted);
}

private void browser_DocumentCompleted(object sender, 
 WebBrowserDocumentCompletedEventArgs e)
{
 ((WebBrowser)sender).Document.Window.Error += 
 new HtmlElementErrorEventHandler(Window_Error);
}

private void Window_Error(object sender, 
 HtmlElementErrorEventArgs e)
{
 // Ignore the error and suppress the error dialog box. 
 e.Handled = true;
}
</code></pre>

blocks|key|1299158|text|我发现了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1299159|+private+static+bool+TrySetSuppressScriptErrors(WebBrowser+webBrowser,+bool+value)
++++{
++++++++FieldInfo+field+=+typeof(WebBrowser).GetField("_axIWebBrowser2",+BindingFlags.Instance+%7C+BindingFlags.NonPublic);
++++++++if+(field+!=+null)
++++++++{
++++++++++++object+axIWebBrowser2+=+field.GetValue(webBrowser);
++++++++++++if+(axIWebBrowser2+!=+null)
++++++++++++{
++++++++++++++++axIWebBrowser2.GetType().InvokeMember("Silent",+BindingFlags.SetProperty,+null,+axIWebBrowser2,+new+object[]+{+value+});
++++++++++++++++return+true;
++++++++++++}
++++++++}

++++++++return+false;
++++}|code-block|syntax|javascript|1299160|将webBrowser设置为静默的用法示例:+TrySetSuppressScriptErrors(webBrowser，true)|1299161|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I just found this :

<pre><code> private static bool TrySetSuppressScriptErrors(WebBrowser webBrowser, bool value)
 {
 FieldInfo field = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);
 if (field != null)
 {
 object axIWebBrowser2 = field.GetValue(webBrowser);
 if (axIWebBrowser2 != null)
 {
 axIWebBrowser2.GetType().InvokeMember("Silent", BindingFlags.SetProperty, null, axIWebBrowser2, new object[] { value });
 return true;
 }
 }

 return false;
 }
</code></pre>

usage example to set webBrowser to silent : TrySetSuppressScriptErrors(webBrowser,true)

blocks|key|1084131|text|以下是另一种解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084132|class+extendedWebBrowser+:+WebBrowser
{
++++///+<summary>
++++///+Default+constructor+which+will+make+the+browser+to+ignore+all+errors
++++///+</summary>
++++public+extendedWebBrowser()
++++{
++++++++this.ScriptErrorsSuppressed+=+true;

++++++++FieldInfo+field+=+typeof(WebBrowser).GetField("_axIWebBrowser2",+BindingFlags.Instance+%7C+BindingFlags.NonPublic);
++++++++if+(field+!=+null)
++++++++{
+++++++++++++object+axIWebBrowser2+=+field.GetValue(this);
+++++++++++++axIWebBrowser2.GetType().InvokeMember("Silent",+BindingFlags.SetProperty,+null,+axIWebBrowser2,+new+object[]+{+true+});
++++++++}
++++}
}|code-block|syntax|javascript|1084133|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is an alternative solution:

<pre><code>class extendedWebBrowser : WebBrowser
{
 /// &lt;summary&gt;
 /// Default constructor which will make the browser to ignore all errors
 /// &lt;/summary&gt;
 public extendedWebBrowser()
 {
 this.ScriptErrorsSuppressed = true;

 FieldInfo field = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);
 if (field != null)
 {
 object axIWebBrowser2 = field.GetValue(this);
 axIWebBrowser2.GetType().InvokeMember("Silent", BindingFlags.SetProperty, null, axIWebBrowser2, new object[] { true });
 }
 }
}
</code></pre>

blocks|key|1084226|text|上面的解决方案都不适合我的场景，处理.Navigated和.FileDownload事件似乎很合适，但访问WebBrowser.Document属性抛出了一个UnauthorizedAccessException，这是由跨框架脚本安全性导致的(我们的web内容包含框架-都在相同的域/地址上，但框架有自己的安全漏洞被阻止)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1084227|有效的解决方案是覆盖IOleCommandTarget并在该级别捕获脚本错误命令。下面是实现这一点的WebBrowser子类：|1084228|///+<summary>
///+Subclassed+WebBrowser+that+suppresses+error+pop-ups.
///+
///+Notes.
///+ScriptErrorsSuppressed+property+is+not+used+because+this+actually+suppresses+*all*+pop-ups.
///+
///+More+info+at:
///+http://stackoverflow.com/questions/2476360/disable-javascript-error-in-webbrowser-control
///+</summary>
public+class+WebBrowserEx+:+WebBrowser
{
++++#region+Constructor

++++///+<summary>
++++///+Default+constructor.
++++///+Initialise+browser+control+and+attach+customer+event+handlers.
++++///+</summary>
++++public+WebBrowserEx()
++++{
++++++++this.ScriptErrorsSuppressed+=+false;
++++}

++++#endregion

++++#region+Overrides

++++///+<summary>
++++///+Override+to+allow+custom+script+error+handling.
++++///+</summary>
++++///+<returns></returns>
++++protected+override+WebBrowserSiteBase+CreateWebBrowserSiteBase()
++++{
++++++++return+new+WebBrowserSiteEx(this);
++++}

++++#endregion

++++#region+Inner+Class+[WebBrowserSiteEx]

++++///+<summary>
++++///+Sub-class+to+allow+custom+script+error+handling.
++++///+</summary>
++++protected+class+WebBrowserSiteEx+:+WebBrowserSite,+NativeMethods.IOleCommandTarget
++++{
++++++++///+<summary>
++++++++///+Default+constructor.
++++++++///+</summary>
++++++++public+WebBrowserSiteEx(WebBrowserEx+webBrowser)+:+base+(webBrowser)
++++++++{+++
++++++++}

++++++++///+<summary>Queries+the+object+for+the+status+of+one+or+more+commands+generated+by+user+interface+events.</summary>
++++++++///+<param+name="pguidCmdGroup">The+GUID+of+the+command+group.</param>
++++++++///+<param+name="cCmds">The+number+of+commands+in+<paramref+name="prgCmds"+/>.</param>
++++++++///+<param+name="prgCmds">An+array+of+OLECMD+structures+that+indicate+the+commands+for+which+the+caller+needs+status+information.+This+method+fills+the+<paramref+name="cmdf"+/>+member+of+each+structure+with+values+taken+from+the+OLECMDF+enumeration.</param>
++++++++///+<param+name="pCmdText">An+OLECMDTEXT+structure+in+which+to+return+name+and/or+status+information+of+a+single+command.+This+parameter+can+be+null+to+indicate+that+the+caller+does+not+need+this+information.</param>
++++++++///+<returns>This+method+returns+S_OK+on+success.+Other+possible+return+values+include+the+following.
++++++++///+E_FAIL+The+operation+failed.
++++++++///+E_UNEXPECTED+An+unexpected+error+has+occurred.
++++++++///+E_POINTER+The+<paramref+name="prgCmds"+/>+argument+is+null.
++++++++///+OLECMDERR_E_UNKNOWNGROUP+The+<paramref+name="pguidCmdGroup"+/>+parameter+is+not+null+but+does+not+specify+a+recognized+command+group.</returns>
++++++++public+int+QueryStatus(ref+Guid+pguidCmdGroup,+int+cCmds,+NativeMethods.OLECMD+prgCmds,+IntPtr+pCmdText)
++++++++{
++++++++++++if((int)NativeMethods.OLECMDID.OLECMDID_SHOWSCRIPTERROR+==+prgCmds.cmdID)
++++++++++++{+++//+Do+nothing+(suppress+script+errors)
++++++++++++++++return+NativeMethods.S_OK;
++++++++++++}

++++++++++++//+Indicate+that+command+is+unknown.+The+command+will+then+be+handled+by+another+IOleCommandTarget.
++++++++++++return+NativeMethods.OLECMDERR_E_UNKNOWNGROUP;
++++++++}

++++++++///+<summary>Executes+the+specified+command.</summary>
++++++++///+<param+name="pguidCmdGroup">The+GUID+of+the+command+group.</param>
++++++++///+<param+name="nCmdID">The+command+ID.</param>
++++++++///+<param+name="nCmdexecopt">Specifies+how+the+object+should+execute+the+command.+Possible+values+are+taken+from+the+<see+cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT"+/>+and+<see+cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDID_WINDOWSTATE_FLAG"+/>+enumerations.</param>
++++++++///+<param+name="pvaIn">The+input+arguments+of+the+command.</param>
++++++++///+<param+name="pvaOut">The+output+arguments+of+the+command.</param>
++++++++///+<returns>This+method+returns+S_OK+on+success.+Other+possible+return+values+include+
++++++++///+OLECMDERR_E_UNKNOWNGROUP+The+<paramref+name="pguidCmdGroup"+/>+parameter+is+not+null+but+does+not+specify+a+recognized+command+group.
++++++++///+OLECMDERR_E_NOTSUPPORTED+The+<paramref+name="nCmdID"+/>+parameter+is+not+a+valid+command+in+the+group+identified+by+<paramref+name="pguidCmdGroup"+/>.
++++++++///+OLECMDERR_E_DISABLED+The+command+identified+by+<paramref+name="nCmdID"+/>+is+currently+disabled+and+cannot+be+executed.
++++++++///+OLECMDERR_E_NOHELP+The+caller+has+asked+for+help+on+the+command+identified+by+<paramref+name="nCmdID"+/>,+but+no+help+is+available.
++++++++///+OLECMDERR_E_CANCELED+The+user+canceled+the+execution+of+the+command.</returns>
++++++++public+int+Exec(ref+Guid+pguidCmdGroup,+int+nCmdID,+int+nCmdexecopt,+object[]+pvaIn,+int+pvaOut)
++++++++{
++++++++++++if((int)NativeMethods.OLECMDID.OLECMDID_SHOWSCRIPTERROR+==+nCmdID)
++++++++++++{+++//+Do+nothing+(suppress+script+errors)
++++++++++++++++return+NativeMethods.S_OK;
++++++++++++}

++++++++++++//+Indicate+that+command+is+unknown.+The+command+will+then+be+handled+by+another+IOleCommandTarget.
++++++++++++return+NativeMethods.OLECMDERR_E_UNKNOWNGROUP;
++++++++}
++++}

++++#endregion
}|code-block|syntax|javascript|1084229|~|1084230|///+<summary>
///+Native+(unmanaged)+methods,+required+for+custom+command+handling+for+the+WebBrowser+control.
///+</summary>
public+static+class+NativeMethods
{
++++///+From+docobj.h
++++public+const+int+OLECMDERR_E_UNKNOWNGROUP+=+-2147221244;

++++///+<summary>
++++///+From+Microsoft.VisualStudio.OLE.Interop+(Visual+Studio+2010+SDK).
++++///+</summary>
++++public+enum+OLECMDID
++++{
++++++++///+<summary+/>
++++++++OLECMDID_OPEN+=+1,
++++++++///+<summary+/>
++++++++OLECMDID_NEW,
++++++++///+<summary+/>
++++++++OLECMDID_SAVE,
++++++++///+<summary+/>
++++++++OLECMDID_SAVEAS,
++++++++///+<summary+/>
++++++++OLECMDID_SAVECOPYAS,
++++++++///+<summary+/>
++++++++OLECMDID_PRINT,
++++++++///+<summary+/>
++++++++OLECMDID_PRINTPREVIEW,
++++++++///+<summary+/>
++++++++OLECMDID_PAGESETUP,
++++++++///+<summary+/>
++++++++OLECMDID_SPELL,
++++++++///+<summary+/>
++++++++OLECMDID_PROPERTIES,
++++++++///+<summary+/>
++++++++OLECMDID_CUT,
++++++++///+<summary+/>
++++++++OLECMDID_COPY,
++++++++///+<summary+/>
++++++++OLECMDID_PASTE,
++++++++///+<summary+/>
++++++++OLECMDID_PASTESPECIAL,
++++++++///+<summary+/>
++++++++OLECMDID_UNDO,
++++++++///+<summary+/>
++++++++OLECMDID_REDO,
++++++++///+<summary+/>
++++++++OLECMDID_SELECTALL,
++++++++///+<summary+/>
++++++++OLECMDID_CLEARSELECTION,
++++++++///+<summary+/>
++++++++OLECMDID_ZOOM,
++++++++///+<summary+/>
++++++++OLECMDID_GETZOOMRANGE,
++++++++///+<summary+/>
++++++++OLECMDID_UPDATECOMMANDS,
++++++++///+<summary+/>
++++++++OLECMDID_REFRESH,
++++++++///+<summary+/>
++++++++OLECMDID_STOP,
++++++++///+<summary+/>
++++++++OLECMDID_HIDETOOLBARS,
++++++++///+<summary+/>
++++++++OLECMDID_SETPROGRESSMAX,
++++++++///+<summary+/>
++++++++OLECMDID_SETPROGRESSPOS,
++++++++///+<summary+/>
++++++++OLECMDID_SETPROGRESSTEXT,
++++++++///+<summary+/>
++++++++OLECMDID_SETTITLE,
++++++++///+<summary+/>
++++++++OLECMDID_SETDOWNLOADSTATE,
++++++++///+<summary+/>
++++++++OLECMDID_STOPDOWNLOAD,
++++++++///+<summary+/>
++++++++OLECMDID_ONTOOLBARACTIVATED,
++++++++///+<summary+/>
++++++++OLECMDID_FIND,
++++++++///+<summary+/>
++++++++OLECMDID_DELETE,
++++++++///+<summary+/>
++++++++OLECMDID_HTTPEQUIV,
++++++++///+<summary+/>
++++++++OLECMDID_HTTPEQUIV_DONE,
++++++++///+<summary+/>
++++++++OLECMDID_ENABLE_INTERACTION,
++++++++///+<summary+/>
++++++++OLECMDID_ONUNLOAD,
++++++++///+<summary+/>
++++++++OLECMDID_PROPERTYBAG2,
++++++++///+<summary+/>
++++++++OLECMDID_PREREFRESH,
++++++++///+<summary+/>
++++++++OLECMDID_SHOWSCRIPTERROR,
++++++++///+<summary+/>
++++++++OLECMDID_SHOWMESSAGE,
++++++++///+<summary+/>
++++++++OLECMDID_SHOWFIND,
++++++++///+<summary+/>
++++++++OLECMDID_SHOWPAGESETUP,
++++++++///+<summary+/>
++++++++OLECMDID_SHOWPRINT,
++++++++///+<summary+/>
++++++++OLECMDID_CLOSE,
++++++++///+<summary+/>
++++++++OLECMDID_ALLOWUILESSSAVEAS,
++++++++///+<summary+/>
++++++++OLECMDID_DONTDOWNLOADCSS,
++++++++///+<summary+/>
++++++++OLECMDID_UPDATEPAGESTATUS,
++++++++///+<summary+/>
++++++++OLECMDID_PRINT2,
++++++++///+<summary+/>
++++++++OLECMDID_PRINTPREVIEW2,
++++++++///+<summary+/>
++++++++OLECMDID_SETPRINTTEMPLATE,
++++++++///+<summary+/>
++++++++OLECMDID_GETPRINTTEMPLATE
++++}

++++///+<summary>
++++///+From+Microsoft.VisualStudio.Shell+(Visual+Studio+2010+SDK).
++++///+</summary>
++++public+const+int+S_OK+=+0;

++++///+<summary>
++++///+OLE+command+structure.
++++///+</summary>
++++[StructLayout(LayoutKind.Sequential)]
++++public+class+OLECMD
++++{
++++++++///+<summary>
++++++++///+Command+ID.
++++++++///+</summary>
++++++++[MarshalAs(UnmanagedType.U4)]
++++++++public+int+cmdID;
++++++++///+<summary>
++++++++///+Flags+associated+with+cmdID.
++++++++///+</summary>
++++++++[MarshalAs(UnmanagedType.U4)]
++++++++public+int+cmdf;
++++}

++++///+<summary>
++++///+Enables+the+dispatching+of+commands+between+objects+and+containers.
++++///+</summary>
++++[ComVisible(true),+Guid("B722BCCB-4E68-101B-A2BC-00AA00404770"),+InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
++++[ComImport]
++++public+interface+IOleCommandTarget
++++{
++++++++///+<summary>Queries+the+object+for+the+status+of+one+or+more+commands+generated+by+user+interface+events.</summary>
++++++++///+<param+name="pguidCmdGroup">The+GUID+of+the+command+group.</param>
++++++++///+<param+name="cCmds">The+number+of+commands+in+<paramref+name="prgCmds"+/>.</param>
++++++++///+<param+name="prgCmds">An+array+of+<see+cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMD"+/>+structures+that+indicate+the+commands+for+which+the+caller+needs+status+information.</param>
++++++++///+<param+name="pCmdText">An+<see+cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDTEXT"+/>+structure+in+which+to+return+name+and/or+status+information+of+a+single+command.+This+parameter+can+be+null+to+indicate+that+the+caller+does+not+need+this+information.</param>
++++++++///+<returns>This+method+returns+S_OK+on+success.+Other+possible+return+values+include+the+following.
++++++++///+E_FAIL+The+operation+failed.
++++++++///+E_UNEXPECTED+An+unexpected+error+has+occurred.
++++++++///+E_POINTER+The+<paramref+name="prgCmds"+/>+argument+is+null.
++++++++///+OLECMDERR_E_UNKNOWNGROUPThe+<paramref+name="pguidCmdGroup"+/>+parameter+is+not+null+but+does+not+specify+a+recognized+command+group.</returns>
++++++++[PreserveSig]
++++++++[return:+MarshalAs(UnmanagedType.I4)]
++++++++int+QueryStatus(ref+Guid+pguidCmdGroup,+int+cCmds,+[In]+[Out]+NativeMethods.OLECMD+prgCmds,+[In]+[Out]+IntPtr+pCmdText);

++++++++///+<summary>Executes+the+specified+command.</summary>
++++++++///+<param+name="pguidCmdGroup">The+GUID+of+the+command+group.</param>
++++++++///+<param+name="nCmdID">The+command+ID.</param>
++++++++///+<param+name="nCmdexecopt">Specifies+how+the+object+should+execute+the+command.+Possible+values+are+taken+from+the+<see+cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT"+/>+and+<see+cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDID_WINDOWSTATE_FLAG"+/>+enumerations.</param>
++++++++///+<param+name="pvaIn">The+input+arguments+of+the+command.</param>
++++++++///+<param+name="pvaOut">The+output+arguments+of+the+command.</param>
++++++++///+<returns>This+method+returns+S_OK+on+success.+Other+possible+return+values+include+
++++++++///+OLECMDERR_E_UNKNOWNGROUP+The+<paramref+name="pguidCmdGroup"+/>+parameter+is+not+null+but+does+not+specify+a+recognized+command+group.
++++++++///+OLECMDERR_E_NOTSUPPORTED+The+<paramref+name="nCmdID"+/>+parameter+is+not+a+valid+command+in+the+group+identified+by+<paramref+name="pguidCmdGroup"+/>.
++++++++///+OLECMDERR_E_DISABLED+The+command+identified+by+<paramref+name="nCmdID"+/>+is+currently+disabled+and+cannot+be+executed.
++++++++///+OLECMDERR_E_NOHELP+The+caller+has+asked+for+help+on+the+command+identified+by+<paramref+name="nCmdID"+/>,+but+no+help+is+available.
++++++++///+OLECMDERR_E_CANCELED+The+user+canceled+the+execution+of+the+command.</returns>
++++++++[PreserveSig]
++++++++[return:+MarshalAs(UnmanagedType.I4)]
++++++++int+Exec(ref+Guid+pguidCmdGroup,+int+nCmdID,+int+nCmdexecopt,+[MarshalAs(UnmanagedType.LPArray)]+[In]+object[]+pvaIn,+int+pvaOut);
++++}
}|1084231|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

None of the above solutions were suitable for my scenario, handling .Navigated and .FileDownload events seemed like a good fit but accessing the WebBrowser.Document property threw an UnauthorizedAccessException which is caused by cross frame scripting security (our web content contains frames - all on the same domain/address but frames have their own security holes that are being blocked).

The solution that worked was to override IOleCommandTarget and to catch the script error commands at that level. Here's the WebBrowser sub-class to achieve this:

<pre><code>/// &lt;summary&gt;
/// Subclassed WebBrowser that suppresses error pop-ups.
/// 
/// Notes.
/// ScriptErrorsSuppressed property is not used because this actually suppresses *all* pop-ups.
/// 
/// More info at:
/// http://stackoverflow.com/questions/2476360/disable-javascript-error-in-webbrowser-control
/// &lt;/summary&gt;
public class WebBrowserEx : WebBrowser
{
 #region Constructor

 /// &lt;summary&gt;
 /// Default constructor.
 /// Initialise browser control and attach customer event handlers.
 /// &lt;/summary&gt;
 public WebBrowserEx()
 {
 this.ScriptErrorsSuppressed = false;
 }

 #endregion

 #region Overrides

 /// &lt;summary&gt;
 /// Override to allow custom script error handling.
 /// &lt;/summary&gt;
 /// &lt;returns&gt;&lt;/returns&gt;
 protected override WebBrowserSiteBase CreateWebBrowserSiteBase()
 {
 return new WebBrowserSiteEx(this);
 }

 #endregion

 #region Inner Class [WebBrowserSiteEx]

 /// &lt;summary&gt;
 /// Sub-class to allow custom script error handling.
 /// &lt;/summary&gt;
 protected class WebBrowserSiteEx : WebBrowserSite, NativeMethods.IOleCommandTarget
 {
 /// &lt;summary&gt;
 /// Default constructor.
 /// &lt;/summary&gt;
 public WebBrowserSiteEx(WebBrowserEx webBrowser) : base (webBrowser)
 { 
 }

 /// &lt;summary&gt;Queries the object for the status of one or more commands generated by user interface events.&lt;/summary&gt;
 /// &lt;param name="pguidCmdGroup"&gt;The GUID of the command group.&lt;/param&gt;
 /// &lt;param name="cCmds"&gt;The number of commands in &lt;paramref name="prgCmds" /&gt;.&lt;/param&gt;
 /// &lt;param name="prgCmds"&gt;An array of OLECMD structures that indicate the commands for which the caller needs status information. This method fills the &lt;paramref name="cmdf" /&gt; member of each structure with values taken from the OLECMDF enumeration.&lt;/param&gt;
 /// &lt;param name="pCmdText"&gt;An OLECMDTEXT structure in which to return name and/or status information of a single command. This parameter can be null to indicate that the caller does not need this information.&lt;/param&gt;
 /// &lt;returns&gt;This method returns S_OK on success. Other possible return values include the following.
 /// E_FAIL The operation failed.
 /// E_UNEXPECTED An unexpected error has occurred.
 /// E_POINTER The &lt;paramref name="prgCmds" /&gt; argument is null.
 /// OLECMDERR_E_UNKNOWNGROUP The &lt;paramref name="pguidCmdGroup" /&gt; parameter is not null but does not specify a recognized command group.&lt;/returns&gt;
 public int QueryStatus(ref Guid pguidCmdGroup, int cCmds, NativeMethods.OLECMD prgCmds, IntPtr pCmdText)
 {
 if((int)NativeMethods.OLECMDID.OLECMDID_SHOWSCRIPTERROR == prgCmds.cmdID)
 { // Do nothing (suppress script errors)
 return NativeMethods.S_OK;
 }

 // Indicate that command is unknown. The command will then be handled by another IOleCommandTarget.
 return NativeMethods.OLECMDERR_E_UNKNOWNGROUP;
 }

 /// &lt;summary&gt;Executes the specified command.&lt;/summary&gt;
 /// &lt;param name="pguidCmdGroup"&gt;The GUID of the command group.&lt;/param&gt;
 /// &lt;param name="nCmdID"&gt;The command ID.&lt;/param&gt;
 /// &lt;param name="nCmdexecopt"&gt;Specifies how the object should execute the command. Possible values are taken from the &lt;see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT" /&gt; and &lt;see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDID_WINDOWSTATE_FLAG" /&gt; enumerations.&lt;/param&gt;
 /// &lt;param name="pvaIn"&gt;The input arguments of the command.&lt;/param&gt;
 /// &lt;param name="pvaOut"&gt;The output arguments of the command.&lt;/param&gt;
 /// &lt;returns&gt;This method returns S_OK on success. Other possible return values include 
 /// OLECMDERR_E_UNKNOWNGROUP The &lt;paramref name="pguidCmdGroup" /&gt; parameter is not null but does not specify a recognized command group.
 /// OLECMDERR_E_NOTSUPPORTED The &lt;paramref name="nCmdID" /&gt; parameter is not a valid command in the group identified by &lt;paramref name="pguidCmdGroup" /&gt;.
 /// OLECMDERR_E_DISABLED The command identified by &lt;paramref name="nCmdID" /&gt; is currently disabled and cannot be executed.
 /// OLECMDERR_E_NOHELP The caller has asked for help on the command identified by &lt;paramref name="nCmdID" /&gt;, but no help is available.
 /// OLECMDERR_E_CANCELED The user canceled the execution of the command.&lt;/returns&gt;
 public int Exec(ref Guid pguidCmdGroup, int nCmdID, int nCmdexecopt, object[] pvaIn, int pvaOut)
 {
 if((int)NativeMethods.OLECMDID.OLECMDID_SHOWSCRIPTERROR == nCmdID)
 { // Do nothing (suppress script errors)
 return NativeMethods.S_OK;
 }

 // Indicate that command is unknown. The command will then be handled by another IOleCommandTarget.
 return NativeMethods.OLECMDERR_E_UNKNOWNGROUP;
 }
 }

 #endregion
}
</code></pre>

~

<pre><code>/// &lt;summary&gt;
/// Native (unmanaged) methods, required for custom command handling for the WebBrowser control.
/// &lt;/summary&gt;
public static class NativeMethods
{
 /// From docobj.h
 public const int OLECMDERR_E_UNKNOWNGROUP = -2147221244;

 /// &lt;summary&gt;
 /// From Microsoft.VisualStudio.OLE.Interop (Visual Studio 2010 SDK).
 /// &lt;/summary&gt;
 public enum OLECMDID
 {
 /// &lt;summary /&gt;
 OLECMDID_OPEN = 1,
 /// &lt;summary /&gt;
 OLECMDID_NEW,
 /// &lt;summary /&gt;
 OLECMDID_SAVE,
 /// &lt;summary /&gt;
 OLECMDID_SAVEAS,
 /// &lt;summary /&gt;
 OLECMDID_SAVECOPYAS,
 /// &lt;summary /&gt;
 OLECMDID_PRINT,
 /// &lt;summary /&gt;
 OLECMDID_PRINTPREVIEW,
 /// &lt;summary /&gt;
 OLECMDID_PAGESETUP,
 /// &lt;summary /&gt;
 OLECMDID_SPELL,
 /// &lt;summary /&gt;
 OLECMDID_PROPERTIES,
 /// &lt;summary /&gt;
 OLECMDID_CUT,
 /// &lt;summary /&gt;
 OLECMDID_COPY,
 /// &lt;summary /&gt;
 OLECMDID_PASTE,
 /// &lt;summary /&gt;
 OLECMDID_PASTESPECIAL,
 /// &lt;summary /&gt;
 OLECMDID_UNDO,
 /// &lt;summary /&gt;
 OLECMDID_REDO,
 /// &lt;summary /&gt;
 OLECMDID_SELECTALL,
 /// &lt;summary /&gt;
 OLECMDID_CLEARSELECTION,
 /// &lt;summary /&gt;
 OLECMDID_ZOOM,
 /// &lt;summary /&gt;
 OLECMDID_GETZOOMRANGE,
 /// &lt;summary /&gt;
 OLECMDID_UPDATECOMMANDS,
 /// &lt;summary /&gt;
 OLECMDID_REFRESH,
 /// &lt;summary /&gt;
 OLECMDID_STOP,
 /// &lt;summary /&gt;
 OLECMDID_HIDETOOLBARS,
 /// &lt;summary /&gt;
 OLECMDID_SETPROGRESSMAX,
 /// &lt;summary /&gt;
 OLECMDID_SETPROGRESSPOS,
 /// &lt;summary /&gt;
 OLECMDID_SETPROGRESSTEXT,
 /// &lt;summary /&gt;
 OLECMDID_SETTITLE,
 /// &lt;summary /&gt;
 OLECMDID_SETDOWNLOADSTATE,
 /// &lt;summary /&gt;
 OLECMDID_STOPDOWNLOAD,
 /// &lt;summary /&gt;
 OLECMDID_ONTOOLBARACTIVATED,
 /// &lt;summary /&gt;
 OLECMDID_FIND,
 /// &lt;summary /&gt;
 OLECMDID_DELETE,
 /// &lt;summary /&gt;
 OLECMDID_HTTPEQUIV,
 /// &lt;summary /&gt;
 OLECMDID_HTTPEQUIV_DONE,
 /// &lt;summary /&gt;
 OLECMDID_ENABLE_INTERACTION,
 /// &lt;summary /&gt;
 OLECMDID_ONUNLOAD,
 /// &lt;summary /&gt;
 OLECMDID_PROPERTYBAG2,
 /// &lt;summary /&gt;
 OLECMDID_PREREFRESH,
 /// &lt;summary /&gt;
 OLECMDID_SHOWSCRIPTERROR,
 /// &lt;summary /&gt;
 OLECMDID_SHOWMESSAGE,
 /// &lt;summary /&gt;
 OLECMDID_SHOWFIND,
 /// &lt;summary /&gt;
 OLECMDID_SHOWPAGESETUP,
 /// &lt;summary /&gt;
 OLECMDID_SHOWPRINT,
 /// &lt;summary /&gt;
 OLECMDID_CLOSE,
 /// &lt;summary /&gt;
 OLECMDID_ALLOWUILESSSAVEAS,
 /// &lt;summary /&gt;
 OLECMDID_DONTDOWNLOADCSS,
 /// &lt;summary /&gt;
 OLECMDID_UPDATEPAGESTATUS,
 /// &lt;summary /&gt;
 OLECMDID_PRINT2,
 /// &lt;summary /&gt;
 OLECMDID_PRINTPREVIEW2,
 /// &lt;summary /&gt;
 OLECMDID_SETPRINTTEMPLATE,
 /// &lt;summary /&gt;
 OLECMDID_GETPRINTTEMPLATE
 }

 /// &lt;summary&gt;
 /// From Microsoft.VisualStudio.Shell (Visual Studio 2010 SDK).
 /// &lt;/summary&gt;
 public const int S_OK = 0;

 /// &lt;summary&gt;
 /// OLE command structure.
 /// &lt;/summary&gt;
 [StructLayout(LayoutKind.Sequential)]
 public class OLECMD
 {
 /// &lt;summary&gt;
 /// Command ID.
 /// &lt;/summary&gt;
 [MarshalAs(UnmanagedType.U4)]
 public int cmdID;
 /// &lt;summary&gt;
 /// Flags associated with cmdID.
 /// &lt;/summary&gt;
 [MarshalAs(UnmanagedType.U4)]
 public int cmdf;
 }

 /// &lt;summary&gt;
 /// Enables the dispatching of commands between objects and containers.
 /// &lt;/summary&gt;
 [ComVisible(true), Guid("B722BCCB-4E68-101B-A2BC-00AA00404770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
 [ComImport]
 public interface IOleCommandTarget
 {
 /// &lt;summary&gt;Queries the object for the status of one or more commands generated by user interface events.&lt;/summary&gt;
 /// &lt;param name="pguidCmdGroup"&gt;The GUID of the command group.&lt;/param&gt;
 /// &lt;param name="cCmds"&gt;The number of commands in &lt;paramref name="prgCmds" /&gt;.&lt;/param&gt;
 /// &lt;param name="prgCmds"&gt;An array of &lt;see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMD" /&gt; structures that indicate the commands for which the caller needs status information.&lt;/param&gt;
 /// &lt;param name="pCmdText"&gt;An &lt;see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDTEXT" /&gt; structure in which to return name and/or status information of a single command. This parameter can be null to indicate that the caller does not need this information.&lt;/param&gt;
 /// &lt;returns&gt;This method returns S_OK on success. Other possible return values include the following.
 /// E_FAIL The operation failed.
 /// E_UNEXPECTED An unexpected error has occurred.
 /// E_POINTER The &lt;paramref name="prgCmds" /&gt; argument is null.
 /// OLECMDERR_E_UNKNOWNGROUPThe &lt;paramref name="pguidCmdGroup" /&gt; parameter is not null but does not specify a recognized command group.&lt;/returns&gt;
 [PreserveSig]
 [return: MarshalAs(UnmanagedType.I4)]
 int QueryStatus(ref Guid pguidCmdGroup, int cCmds, [In] [Out] NativeMethods.OLECMD prgCmds, [In] [Out] IntPtr pCmdText);

 /// &lt;summary&gt;Executes the specified command.&lt;/summary&gt;
 /// &lt;param name="pguidCmdGroup"&gt;The GUID of the command group.&lt;/param&gt;
 /// &lt;param name="nCmdID"&gt;The command ID.&lt;/param&gt;
 /// &lt;param name="nCmdexecopt"&gt;Specifies how the object should execute the command. Possible values are taken from the &lt;see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT" /&gt; and &lt;see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDID_WINDOWSTATE_FLAG" /&gt; enumerations.&lt;/param&gt;
 /// &lt;param name="pvaIn"&gt;The input arguments of the command.&lt;/param&gt;
 /// &lt;param name="pvaOut"&gt;The output arguments of the command.&lt;/param&gt;
 /// &lt;returns&gt;This method returns S_OK on success. Other possible return values include 
 /// OLECMDERR_E_UNKNOWNGROUP The &lt;paramref name="pguidCmdGroup" /&gt; parameter is not null but does not specify a recognized command group.
 /// OLECMDERR_E_NOTSUPPORTED The &lt;paramref name="nCmdID" /&gt; parameter is not a valid command in the group identified by &lt;paramref name="pguidCmdGroup" /&gt;.
 /// OLECMDERR_E_DISABLED The command identified by &lt;paramref name="nCmdID" /&gt; is currently disabled and cannot be executed.
 /// OLECMDERR_E_NOHELP The caller has asked for help on the command identified by &lt;paramref name="nCmdID" /&gt;, but no help is available.
 /// OLECMDERR_E_CANCELED The user canceled the execution of the command.&lt;/returns&gt;
 [PreserveSig]
 [return: MarshalAs(UnmanagedType.I4)]
 int Exec(ref Guid pguidCmdGroup, int nCmdID, int nCmdexecopt, [MarshalAs(UnmanagedType.LPArray)] [In] object[] pvaIn, int pvaOut);
 }
}
</code></pre>

I am developing a windows application with a WebBrowser control that navigates to a sharepoint site. 
My problem is that i am getting JavaScript error.

How can i disable the JavaScript error? I don't want them to pop up.

Disable JavaScript error in WebBrowser control

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在开发一个带有WebBrowser控件的windows应用程序，该控件可导航到sharepoint站点。我的问题是我得到了JavaScript错误。如何禁用JavaScript错误？我不想让他们突然冒出来。

问禁用WebBrowser控件中的JavaScript错误
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