asp.net - 如何在asp.net应用程序中获取Youtube嵌入式视频的描述？

Question

我正在使用以下代码来获取嵌入在我的asp.net应用程序中的youtube视频的标题和描述。我可以看到标题，但看不到描述。

我使用Atomfeed执行此操作...

问题是我为我所有的视频获取的描述都为“Google.GData.Client.AtomTextConstruct” 。

Private Function GetTitle(ByVal myFeed As AtomFeed) As String
    Dim strTitle As String = ""
    For Each entry As AtomEntry In myFeed.Entries
        strTitle = entry.Title.Text
    Next
    Return strTitle
End Function

Private Function GetDesc(ByVal myFeed As AtomFeed) As String
    Dim strDesc As String = ""
    For Each entry As AtomEntry In myFeed.Entries
        strDesc = entry.Summary.ToString()
    Next
    Return strDesc
End Function

Answer 1

我相信，当解析来自原子供稿的XML时，不会处理该描述。看看这个:http://code.google.com/p/google-gdata/wiki/UnderstandingTheUnknown

But what happens with things that are not understood? They end up as an element of the ExtensionElements collection, that is a member of all classes inherited from AtomBase, like AtomFeed, AtomEntry, EventEntry etc...

因此，我们可以做的是像这样从扩展元素中提取描述:

Dim query As New FeedQuery()
Dim service As New Service()
query.Uri = New Uri("https://gdata.youtube.com/feeds/api/standardfeeds/top_rated")
Dim myFeed As AtomFeed = service.Query(query)
For Each entry In myFeed.Entries
    For Each obj As Object In entry.ExtensionElements
        If TypeOf obj Is XmlExtension Then
            Dim xel As XElement = XElement.Parse(TryCast(obj, XmlExtension).Node.OuterXml)
            If xel.Name = "{http://search.yahoo.com/mrss/}group" Then
                Dim descNode = xel.Descendants("{http://search.yahoo.com/mrss/}description").FirstOrDefault()
                If descNode IsNot Nothing Then
                    Console.WriteLine(descNode.Value)
                End If
                Exit For
            End If
        End If
    Next
Next

另外，获取“Google.GData.Client.AtomTextConstruct”的原因是因为Summary是Google.GData.Client.AtomTextConstruct类型的对象，因此执行entry.Summary.ToString()只是为您提供默认的ToString( )的行为。您通常会执行Summary.Text，但这当然是空白的，因为如上所述，库没有正确处理它。