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 override int GetHelpTopic(out string?fileName)
{
int topic = 0;
QueryAccessibilityHelpEventHandler?handler = (QueryAccessibilityHelpEventHandler?)Owner.Events[s_queryAccessibilityHelpEvent];
if (handler is null)
{
return(base.GetHelpTopic(out fileName));
}
QueryAccessibilityHelpEventArgs args = new QueryAccessibilityHelpEventArgs();
handler(Owner, args);
fileName = args.HelpNamespace;
try
{
topic = int.Parse(args.HelpKeyword, CultureInfo.InvariantCulture);
}
catch (Exception e) when(!ClientUtils.IsCriticalException(e))
{
}
return(topic);
}
/// <include file='doc\HelpProvider.uex' path='docs/doc[@for="HelpProvider.OnQueryAccessibilityHelp"]/*' />
/// <devdoc>
/// Handles the help event for any bound controls.
/// </devdoc>
/// <internalonly/>
private void OnQueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e)
{
Control ctl = (Control)sender;
e.HelpString = GetHelpString(ctl);
e.HelpKeyword = GetHelpKeyword(ctl);
e.HelpNamespace = HelpNamespace;
}
private void HandleQueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e)
{
QueryAccessibilityHelpEventHandler handler = (QueryAccessibilityHelpEventHandler)Events[ToolStripItem.EventQueryAccessibilityHelp];
if (handler != null)
{
handler(this, e);
}
}
public override int GetHelpTopic(out string?fileName)
{
int topic = 0;
QueryAccessibilityHelpEventHandler?handler = (QueryAccessibilityHelpEventHandler?)Owner.Events[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));
}
/// <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);
}
/// <include file='doc\HelpProvider.uex' path='docs/doc[@for="HelpProvider.OnQueryAccessibilityHelp"]/*' />
/// <devdoc>
/// Handles the help event for any bound controls.
/// </devdoc>
/// <internalonly/>
private void OnQueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e) {
Control ctl = (Control)sender;
e.HelpString = GetHelpString(ctl);
e.HelpKeyword = GetHelpKeyword(ctl);
e.HelpNamespace = HelpNamespace;
}
private void ParseErrorDialog_QueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e)
{
}
// Handles the QueryAccessibilityHelp event.
private void ChartControl_QueryAccessibilityHelp(object sender,
System.Windows.Forms.QueryAccessibilityHelpEventArgs e)
{
e.HelpString = "Displays chart data";
}
// <Snippet2>
private void ovalShape1_QueryAccessibilityHelp(object sender,
System.Windows.Forms.QueryAccessibilityHelpEventArgs e)
{
e.HelpString = "Displays an oval representing a network node.";
}
private void HandleQueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e)
{
QueryAccessibilityHelpEventHandler handler = (QueryAccessibilityHelpEventHandler) base.Events[ToolStripItem.EventQueryAccessibilityHelp];
if (handler != null)
{
handler(this, e);
}
}
// Methods that support "AccessibleObject".
// Get the accessibility help information.
internal String GetAccessibilityHelp()
{
QueryAccessibilityHelpEventArgs e;
e = new QueryAccessibilityHelpEventArgs();
OnQueryAccessibilityHelp(e);
return e.HelpString;
}
protected virtual void OnQueryAccessibilityHelp
(QueryAccessibilityHelpEventArgs e)
{
QueryAccessibilityHelpEventHandler handler;
handler = (QueryAccessibilityHelpEventHandler)
(GetHandler(EventId.QueryAccessibilityHelp));
if(handler != null)
{
handler(this, e);
}
}
void OnQueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e) {
ToolStripItem ctl = (ToolStripItem)sender;
e.HelpString = GetHelpString(ctl);
e.HelpKeyword = GetHelpKeyword(ctl);
e.HelpNamespace = HelpNamespace;
}
public override int GetHelpTopic(out string fileName)
{
int num = 0;
QueryAccessibilityHelpEventHandler handler = (QueryAccessibilityHelpEventHandler) this.Owner.Events[ToolStripItem.EventQueryAccessibilityHelp];
if (handler == null)
{
return base.GetHelpTopic(out fileName);
}
QueryAccessibilityHelpEventArgs e = new QueryAccessibilityHelpEventArgs();
handler(this.Owner, e);
fileName = e.HelpNamespace;
if ((fileName != null) && (fileName.Length > 0))
{
System.Windows.Forms.IntSecurity.DemandFileIO(FileIOPermissionAccess.PathDiscovery, fileName);
}
try
{
num = int.Parse(e.HelpKeyword, CultureInfo.InvariantCulture);
}
catch
{
}
return num;
}
