System.Windows.Forms.Help

　　在开发过程中，基本都需要实现帮助功能，而一般帮助功能就是打开一个帮助文档，System.Windows.Forms提供了Help类用于打开帮助文档，挺方便的。

　　Help类提供的方法如下：

	Name	Description
	Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ShowHelp(Control, String)	Displays the contents of the Help file at the specified URL.
	ShowHelp(Control, String, String)	Displays the contents of the Help file found at the specified URL for a specific keyword.
	ShowHelp(Control, String, HelpNavigator)	Displays the contents of the Help file found at the specified URL for a specific topic.
	ShowHelp(Control, String, HelpNavigator, Object)	Displays the contents of the Help file located at the URL supplied by the user.
	ShowHelpIndex	Displays the index of the specified Help file.
	ShowPopup	Displays a Help pop-up window.

　　LZ一般使用ShowHelp(Control, String, HelpNavigator)方法：

　　System.Windows.Forms.Help.ShowHelp(this, helpFilePath, System.Windows.Forms.HelpNavigator.TableOfContents);

　　其中，this表示当前的窗体，helpFilePath为帮助文件路径，HelpNavigator指定帮助文件的显示元素。

　　HelpNavigator：Specifies constants indicating which elements of the Help file to display.

	Member name	Description
	AssociateIndex	The Help file opens to the index entry for the first letter of a specified topic.
	Find	The Help file opens to the search page.
	Index	The Help file opens to the index.
	KeywordIndex	The Help file opens to the topic with the specified index entry, if one exists; otherwise, the index entry closest to the specified keyword is displayed.
	TableOfContents	The Help file opens to the table of contents.
	Topic	The Help file opens to a specified topic, if the topic exists.
	TopicId	The Help file opens to a topic indicated by a numeric topic identifier.