public override int GetHelpTopic(out string fileName)
{
int topic = 0;
QueryAccessibilityHelpEventHandler handler = (QueryAccessibilityHelpEventHandler)Owner.Events[ToolStripItem.s_queryAccessibilityHelpEvent];
if (handler != null)
{
QueryAccessibilityHelpEventArgs args = new QueryAccessibilityHelpEventArgs();
handler(Owner, args);
fileName = args.HelpNamespace;
try
{
topic = int.Parse(args.HelpKeyword, CultureInfo.InvariantCulture);
}
catch
{
}
return(topic);
}
return(base.GetHelpTopic(out fileName));
}
public void WebBrowserBase_QueryAccessibilityHelp__AddRemove_ThrowsNotSupportedException()
{
using var control = new SubWebBrowserBase("8856f961-340a-11d0-a96b-00c04fd705a2");
QueryAccessibilityHelpEventHandler handler = (sender, e) => { };
Assert.Throws <NotSupportedException>(() => control.QueryAccessibilityHelp += handler);
control.QueryAccessibilityHelp -= handler;
}
public void AxHost_QueryAccessibilityHelp__AddRemove_ThrowsNotSupportedException()
{
var control = new SubAxHost("00000000-0000-0000-0000-000000000000");
QueryAccessibilityHelpEventHandler handler = (sender, e) => { };
Assert.Throws <NotSupportedException>(() => control.QueryAccessibilityHelp += handler);
control.QueryAccessibilityHelp -= handler;
}
private void HandleQueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e)
{
QueryAccessibilityHelpEventHandler handler = (QueryAccessibilityHelpEventHandler)Events[ToolStripItem.EventQueryAccessibilityHelp];
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// queryaccessibilityhelpeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this QueryAccessibilityHelpEventHandler queryaccessibilityhelpeventhandler, Object sender, QueryAccessibilityHelpEventArgs e, AsyncCallback callback)
{
if (queryaccessibilityhelpeventhandler == null)
{
throw new ArgumentNullException("queryaccessibilityhelpeventhandler");
}
return(queryaccessibilityhelpeventhandler.BeginInvoke(sender, e, callback, null));
}
public override int GetHelpTopic(out string fileName)
{
int topic = 0;
QueryAccessibilityHelpEventHandler handler = (QueryAccessibilityHelpEventHandler)Owner.Events[ToolStripItem.s_queryAccessibilityHelpEvent];
if (handler is not null)
{
QueryAccessibilityHelpEventArgs args = new QueryAccessibilityHelpEventArgs();
handler(Owner, args);
fileName = args.HelpNamespace;
int.TryParse(args.HelpKeyword, NumberStyles.Integer, CultureInfo.InvariantCulture, out topic);
return(topic);
}
return(base.GetHelpTopic(out fileName));
}