【发布时间】：2014-11-03 23:05:02
【问题描述】：
我正在使用 C# 使用 Web 应用程序，用户将在其中浏览视频文件，Web 应用程序将通过 YouTube API V3 上传到 YouTube。我收到错误消息。请指教我哪里做错了？
错误：System.ArgumentNullException：值不能为空。参数名称：Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess(Task task) 的 Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 的 baseUri.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) .CompilerServices.ConfiguredTaskAwaitable1.ConfiguredTaskAwaiter.GetResult() 在 c:\code\google.com\google-api-dotnet-client\default\Tools\Google.Apis 中的 Google.Apis.Upload.ResumableUpload1.d__e.MoveNext()。 Release\bin\Debug\output\default\Src\GoogleApis\Apis[Media]\Upload\ResumableUpload.cs:459行
我遵循以下几点。
- 为 Web 应用程序创建 ClientID 并从 API 访问页面下载 client_secrets.json 文件。
- 使用了https://developers.google.com/youtube/v3/docs/videos/insert#examples 中提供的.Net 示例代码，也引用了https://developers.google.com/youtube/v3/code_samples/dotnet 中的相同代码
- 我的应用程序已获得 YouTube API 的授权。
- 上传视频文件时出现以下错误。
我在下面粘贴我的代码供您参考。
/* TestFileUploader.aspx */
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestFileUploader.aspx.cs" Inherits="TestFileUploader" Async="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
</head>
<body>
<form id="qaform" runat="server">
<div>
<p>
<asp:FileUpload runat="server" ID="FileUpload1" onchange="AddEventChoosePicture(this,'FileUpload1')"
Style="width: 100%;" />
</p>
<p>
<asp:Button ID="submit" runat="server" OnClick="submit_Click" Text="Submit" />
</p>
</div>
</form>
</body>
</html>
/* TestFileUploader.aspx.cs */
using System;
using System.Web;
using System.IO;
using QA.credential;
using Google.Apis.Auth.OAuth2;
using Google.Apis.YouTube.v3;
using Google.Apis.Services;
using Google.Apis.YouTube.v3.Data;
using Google.Apis.Upload;
public partial class TestFileUploader : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void submit_Click(object sender, EventArgs e)
{
try
{
if (FileUpload1.HasFile)
{
String FileUpload1_Ext = System.IO.Path.GetExtension(this.FileUpload1.PostedFile.FileName);
UploadVideos(FileUpload1.FileContent, FileUpload1.PostedFile.ContentType);
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}
private async void UploadVideos(Stream uploadedStream, String contenttype)
{
try
{
UserCredential credential;
String clientsecretkeypath = HttpContext.Current.Server.MapPath("~/client_secrets.json");
using (var stream = new FileStream(clientsecretkeypath, FileMode.Open, FileAccess.Read))
{
credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
new[] { YouTubeService.Scope.YoutubeUpload },
"user", System.Threading.CancellationToken.None);
}
// Create the service.
var youtubeService = new YouTubeService(new BaseClientService.Initializer()
{
//ApiKey = "AIzaSyAFxuAA4r4pf6VX75zEwCrIh5z4QkzOZ6M",
HttpClientInitializer = credential,
ApplicationName = PhotoandVideoupload.applicationname
});
var video = new Video();
video.Snippet = new VideoSnippet();
video.Snippet.Title = "My Test Movie";
video.Snippet.Description = "My description";
video.Snippet.Tags = new string[] { "Autos" };
video.Snippet.CategoryId = "2";
video.Status = new VideoStatus();
video.Status.PrivacyStatus = "unlisted";
// Using snippet,status below throws 401(UnAuthorized issue).
// Using snippet alone throws 404(Bad Request).
//In both case, Null Exception throws for parameter baseURI.
var videosInsertRequest = youtubeService.Videos.Insert(video, "snippet", uploadedStream, contenttype);
videosInsertRequest.ProgressChanged += videosInsertRequest_ProgressChanged;
videosInsertRequest.ResponseReceived += videosInsertRequest_ResponseReceived;
Google.Apis.Upload.IUploadProgress progress = await videosInsertRequest.UploadAsync();
switch (progress.Status)
{
case UploadStatus.Uploading:
Response.Write(String.Format("{0} bytes sent.", progress.BytesSent));
break;
case UploadStatus.Failed:
Response.Write(String.Format("{0}<br/>", progress.Exception.Message));
Response.Write(String.Format("{0}<br/>", progress.Exception.StackTrace));
break;
}
// Also tried to read file from server path instead of uploading via fileupload control.
/*
using (var fileStream = new FileStream(HttpContext.Current.Server.MapPath("~/1.mp4"), FileMode.Open))
{
var videosInsertRequest = youtubeService.Videos.Insert(video, "snippet,status", fileStream, contenttype);
videosInsertRequest.ProgressChanged += videosInsertRequest_ProgressChanged;
videosInsertRequest.ResponseReceived += videosInsertRequest_ResponseReceived;
await videosInsertRequest.UploadAsync();
}
*/
}
catch (Exception ex)
{
Response.Write(ex.Message + " " + ex.StackTrace);
}
finally
{
}
}
void videosInsertRequest_ProgressChanged(Google.Apis.Upload.IUploadProgress progress)
{
switch (progress.Status)
{
case UploadStatus.Uploading:
Response.Write(String.Format("{0} bytes sent.", progress.BytesSent));
break;
case UploadStatus.Failed:
Response.Write(String.Format("{0}<br/>", progress.Exception.Message));
Response.Write(String.Format("{0}<br/>", progress.Exception.StackTrace));
break;
}
}
void videosInsertRequest_ResponseReceived(Video video)
{
Response.Write(String.Format("Video id '{0}' was successfully uploaded.", video.Id));
}
}
请指教我哪里做错了？
谢谢，
【问题讨论】：
-
您可能希望使用 Fiddler 来捕获底层错误。当我有一个参数错误时，我遇到了这个错误。通过 Fiddler 记录 IP 数据包，我能够看到名为 bad 参数的潜在错误。 Google API DotNet 客户端Issue 480 要求增强 API 以返回包含底层错误的对象。如果您认为它可以帮助您将来进一步调试，请投赞成票。
-
你成功通过了这个错误吗？
-
@Briller：还没有。如果您发现实际问题，请在此处分享。
-
@DCI ：我发现这是通用错误，通常出现在另一个异常之后。在这里查看我的评论：stackoverflow.com/questions/26204080/…
标签： youtube-api