public void ShowContextHelp(int ContextID, string HelpFileName)
{
bool foundViewer = false;
foreach (var viewer in helpViewers)
{
IExtendedHelpViewer extviewer = viewer as IExtendedHelpViewer;
if (extviewer != null)
{
foundViewer = true;
if (extviewer.UnderstandsContext(ContextID, HelpFileName))
{
extviewer.DisplayHelpByContext(ContextID, HelpFileName);
return;
}
}
}
if (!foundViewer)
{
throw new EHelpSystemException("No help viewer found that implements IExtendedHelpViewer.");
}
}
public void ShowTopicHelp(string Topic, string HelpFileName)
{
bool foundViewer = false;
foreach (var viewer in helpViewers)
{
IExtendedHelpViewer extviewer = viewer as IExtendedHelpViewer;
if (extviewer != null)
{
foundViewer = true;
if (extviewer.UnderstandsTopic(Topic))
{
extviewer.DisplayTopic(Topic);
return;
}
}
}
if (!foundViewer)
{
throw new EHelpSystemException("No help viewer found that implements IExtendedHelpViewer.");
}
}