好的，这就是我最终如何解决此问题的说明。
我希望使用 YouTube 数据 API 实现的目标是根据用户名或频道 ID 从任何 YouTube 频道检索视频列表。
理想情况下，我们应该能够向 YouTube 索要来自特定 YouTube 频道的所有视频。但是，它似乎不是那样工作的。
最终，我们需要向 YouTubeService.Videos.List 方法发送视频列表请求。这将允许我们检索视频对象列表的内容详细信息、sn-p 和统计信息。但是，此方法需要几个参数。一个是 VideoListRequest.ID 参数，它是您希望检索的视频集合中的视频 ID 的字符串数组。另一个是 VideoListRequest.MaxResults 参数。这将是您希望拉回的视频的最大数量。
要检索视频 ID 列表，我们需要再次调用 YouTube API 并从 YouTubeService.PlaylistItems.List 方法检索播放列表项列表。但是，此方法需要 UploadsListID，该 ID 必须通过对 YouTube API 的 YouTubeService.Channels.List 方法的另一次调用来获取。
因此，我们需要对 YouTube API 进行 3 次调用，如下图所示。
第一步是根据用户名或频道 ID 获取频道列表。 UploadsListId 将来自 ChannelListResponse：channelListResponse.Items[0].ContentDetails.RelatedPlaylists.Uploads。
第二步是使用上一步中的 UploadsListID 获取播放列表项的列表。这使我们可以检索上传的视频播放列表中每个视频的视频 ID，并将它们放入字符串列表中。
最后，第三步是根据前面的字符串列表中的视频 ID 获取视频列表。通过这个响应，我们可以检索每个视频的时长，并将 YouTube 的 HMS 格式转换为“可用的”Timespan 格式字符串 (h:mm:ss)。
这是我用来完成上述描述的代码：
public async Task<List<Video>> GetVideoListAsync(ChannelListMethod Method, string MethodValue, int? MaxVideos)
{
// Define variables needed for this method
List<string> videoIdList = new List<string>();
List<Video> videoList = new List<Video>();
string uploadsListId = null;
// Make sure values passed into the method are not null or empty.
if (MaxVideos == null)
{
throw new ArgumentNullException(nameof(MaxVideos));
}
if (string.IsNullOrEmpty(MethodValue))
{
return videoList;
}
// Create the service.
using (YouTubeService youtubeService = new YouTubeService(new BaseClientService.Initializer
{
ApiKey = _apiKey,
ApplicationName = _appName
}))
{
// Step ONE is to get a list of channels for a specified YouTube user or ChannelID.
// Create the FIRST Request object to get a list of YouTube Channels and get their contentDetails
// based on either ForUserName or ChannelID.
ChannelsResource.ListRequest channelsListRequest = youtubeService.Channels.List("contentDetails");
if (Method == ChannelListMethod.ForUserName)
{
// Build the ChannelListRequest using UserName
channelsListRequest.ForUsername = MethodValue;
}
else
{
// Build the ChannelListRequest using ChannelID
channelsListRequest.Id = MethodValue;
}
// This is the FIRST Request to the YouTube API.
// Retrieve the contentDetails part of the channel resource to get a list of channel IDs.
// We are only interested in the Uploads playlist of the first channel.
try
{
ChannelListResponse channelsListResponse = await channelsListRequest.ExecuteAsync();
uploadsListId = channelsListResponse.Items[0].ContentDetails.RelatedPlaylists.Uploads;
}
catch (Exception ex)
{
ErrorException = ex;
return videoList;
}
// Step TWO is to get a list of playlist items from the Uploads playlist.
// From the API response, use the Uploads playlist ID (uploadsListId) to be used to get list of videos
// from the videos uploaded to the user's channel.
string nextPageToken = "";
while (nextPageToken != null)
{
// Create the SECOND Request object for requestring a list of Playlist items
// from the channel's Uploads playlist.
// Limit the list to maxVideos items and continue to iterate through the pages.
PlaylistItemsResource.ListRequest playlistItemsListRequest = youtubeService.PlaylistItems.List("contentDetails");
playlistItemsListRequest.PlaylistId = uploadsListId;
playlistItemsListRequest.MaxResults = MaxVideos;
playlistItemsListRequest.PageToken = nextPageToken;
// This is the SECOND Request to YouTube and get a Response object containing
// the playlist items in the channel's Uploads playlist.
// Then iterate through the Response items to build a string list of the video IDs
try
{
PlaylistItemListResponse playlistItemsListResponse = await playlistItemsListRequest.ExecuteAsync();
foreach (PlaylistItem playlistItem in playlistItemsListResponse.Items)
{
videoIdList.Add(playlistItem.ContentDetails.VideoId.ToString());
}
}
catch (Exception ex)
{
ErrorException = ex;
return videoList;
}
// Now that we have a collection (string array) of video IDs,
// Step THREE is to retrieve the snippet, contentDetails, and statistics parts of the
// list of videos uploaded to the authenticated user's channel.
try
{
// Create the THIRD Request object for requestring a list of videos and their associated metadata.
var VideoListRequest = youtubeService.Videos.List("snippet, contentDetails, statistics");
// The next line converts the list of video Ids to a comma seperated string array of the video IDs
VideoListRequest.Id = String.Join(",", videoIdList);
VideoListRequest.MaxResults = MaxVideos;
var VideoListResponse = await VideoListRequest.ExecuteAsync();
// This is the THIRD Request to the YouTube API to get a Response object
// containing Collect each Video duration and convert to a usable time format.
foreach (var video in VideoListResponse.Items)
{
video.ContentDetails.Duration = HMSToTimeSpan(video.ContentDetails.Duration).ToString();
videoList.Add(video);
}
// request next page
nextPageToken = VideoListResponse.NextPageToken;
}
catch (Exception ex)
{
ErrorException = ex;
return videoList;
}
}
return videoList;
}
}
我知道这不是完美的解决方案，或者也许是“最好的”解决方案，但我希望这可以帮助其他人解决同样的问题。
感谢您的所有帮助@Janis S