Chat_News 构造函数

public Chat_News(
	List<Article> articles,
	string title,
	string url,
	string description = null,
	string picurl = null,
	string btntxt = null
)

Public Sub New ( 
	articles As List(Of Article),
	title As String,
	url As String,
	Optional description As String = Nothing,
	Optional picurl As String = Nothing,
	Optional btntxt As String = Nothing
)