我有一个youtube上传器，我正在从一个音频文件中生成一个视频，该工作正常，但当我上传到Youtube时，程序仍在运行，当我试图等待它完成上传之后重复
我在这里制作视频：
private void button2_Click(object sender, EventArgs e)
{
if (status.Text == "Stopped")
{
if (!generatearticle.IsBusy)
{
// started
status.Text = "Started";
status.ForeColor = System.Drawing.Color.Green;
start.Text = "Stop Generating";
generatearticle.RunWorkerAsync();
}
}
else
{
if(generatearticle.IsBusy)
{
generatearticle.CancelAsync();
// started
status.Text = "Stopped";
status.ForeColor = System.Drawing.Color.Red;
start.Text = "Start Generating";
}
}
}
private void core()
{
// generate audio
int i = 0;
for (int n = 1; n < co; n++)
{
// generate video and upload to
// youtube, this generates, but
// when uploading to youtube this for
// loop carries on when I want it to
// upload to youtube first before carrying on
generatevideo(image, articlename);
}
}
private void generateVideo(string images, String articlename)
{
//generate the video here, once done upload
{code removed, this just generates a video, nothing important}
// now upload (but I want it to finish before repeating the core() function
try
{
new UploadVideo().Run(articlename, file);
}
catch (AggregateException ex)
{
foreach (var e in ex.InnerExceptions)
{
ThreadSafe(() =>
{
this.Invoke((MethodInvoker)delegate
{
status.Text = e.Message;
status.ForeColor = System.Drawing.Color.Red;
});
});
}
}
}
我如何上传到Youtube：
using System;
using System.IO;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Upload;
using Google.Apis.Util.Store;
using Google.Apis.YouTube.v3;
using Google.Apis.YouTube.v3.Data;
namespace articletoyoutube
{
/// <summary>
/// YouTube Data API v3 sample: upload a video.
/// Relies on the Google APIs Client Library for .NET, v1.7.0 or higher.
/// See https://code.google.com/p/google-api-dotnet-client/wiki/GettingStarted
/// </summary>
class UploadVideo
{
// to access form controlls
Form1 core = new Form1();
public async Task Run(string articlename, string filelocation)
{
UserCredential credential;
using (var stream = new FileStream("client_secrets.json", FileMode.Open, FileAccess.Read))
{
credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
// This OAuth 2.0 access scope allows an application to upload files to the
// authenticated user's YouTube channel, but doesn't allow other types of access.
new[] {
YouTubeService.Scope.YoutubeUpload
},
"user",
CancellationToken.None
);
}
var youtubeService = new YouTubeService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = Assembly.GetExecutingAssembly().GetName().Name
});
var video = new Video();
video.Snippet = new VideoSnippet();
video.Snippet.Title = articlename;
video.Snippet.Description = "News story regarding" + articlename;
video.Snippet.Tags = new string[] {
"news",
"breaking",
"important"
};
video.Snippet.CategoryId = "25"; // See https://developers.google.com/youtube/v3/docs/videoCategories/list
video.Status = new VideoStatus();
video.Status.PrivacyStatus = "public"; // or "private" or "public"
var filePath = filelocation; // Replace with path to actual movie file.
using (var fileStream = new FileStream(filePath, FileMode.Open))
{
var videosInsertRequest = youtubeService.Videos.Insert(video, "snippet,status", fileStream, "video/*");
videosInsertRequest.ProgressChanged += videosInsertRequest_ProgressChanged;
videosInsertRequest.ResponseReceived += videosInsertRequest_ResponseReceived;
await videosInsertRequest.UploadAsync();
}
}
void videosInsertRequest_ProgressChanged(Google.Apis.Upload.IUploadProgress progress)
{
switch (progress.Status)
{
case UploadStatus.Uploading:
core.prog_up.Text = "{0} bytes sent." + progress.BytesSent;
break;
case UploadStatus.Failed:
core.status.Text = "An error prevented the upload from completing.\n{0}" + progress.Exception;
core.status.ForeColor = System.Drawing.Color.Red;
break;
}
}
void videosInsertRequest_ResponseReceived(Video video)
{
core.prog_up.Text = "Video id '{0}' was successfully uploaded." + video.Id;
}
}
}
后台工作人员只运行core();
当它到达功能时
new UploadVideo().Run(articlename, file);
它开始上传但重新开始重复核心功能，从而在视频上传之前生成另一个视频....如果我使用
new UploadVideo().Run(articlename, file).Wait();
然后程序停止并等待，直到我关闭程序，如何在核心方法中继续前循环之前等待Upload类/方法完成？
对于回答的人，当我在新的上传之前添加等待时......它给了我：
严重级代码描述项目文件行抑制状态 错误CS4033'await'运算符只能在异步中使用 方法。考虑使用'async'修饰符标记此方法 将其返回类型更改为 '任务'。 articletoyoutube C：\ Users \ Laptop \ Documents \ Visual Studio 2017 \ Projects \ articletoyoutube \ articletoyoutube \ Form1.cs 254 Active
答案 0 :(得分：1)
确保在方法上使用async关键字，并为任务使用await关键字。
例如：
private async Task core()
{
// generate audio
int i = 0;
for (int n = 1; n < co; n++)
{
await generatevideo(image, articlename);
}
}
private async Task generateVideo(string images, String articlename)
{
//generate the video here,
try
{
var uploadVideo = new UploadVideo();
await uploadVideo.Run(articlename, file);
}
catch (AggregateException ex)
{
foreach (var e in ex.InnerExceptions)
{
ThreadSafe(() =>
{
this.Invoke((MethodInvoker)delegate
{
status.Text = e.Message;
status.ForeColor = System.Drawing.Color.Red;
});
});
}
}
}
答案 1 :(得分：0)
您需要在调用堆栈中一直使用await到事件处理程序所在的位置，这需要更改许多方法。
private async Task core()
{
// generate audio
int i = 0;
for (int n = 1; n < co; n++)
{
// generate video and upload to
// youtube, this generates, but
// when uploading to youtube this for
// loop carries on when I want it to
// upload to youtube first before carrying on
await generatevideo(image, articlename);
}
}
private async Task generateVideo(string images, String articlename)
{
//generate the video here, once done upload
{code removed, this just generates a video, nothing important}
// now upload (but I want it to finish before repeating the core() function
try
{
await new UploadVideo().Run(articlename, file);
}
catch (AggregateException ex)
{
foreach (var e in ex.InnerExceptions)
{
ThreadSafe(() =>
{
this.Invoke((MethodInvoker)delegate
{
status.Text = e.Message;
status.ForeColor = System.Drawing.Color.Red;
});
});
}
}
}
注意，使用async / await不能与BackgroundWorker一起使用，您需要切换到使用Task.Run和CancellationToken来表示取消。
Task _backgroundWork;
CancellationTokenSource _cts;
private void button2_Click(object sender, EventArgs e)
{
if (status.Text == "Stopped")
{
if (!generatearticle.IsBusy)
{
// started
status.Text = "Started";
status.ForeColor = System.Drawing.Color.Green;
start.Text = "Stop Generating";
_cts = new CancellationTokenSource();
_backgroundWork = Task.Run(() => core(_cts.Token), _cts.Token);
}
}
else
{
if(!_backgroundWork.IsCompleted)
{
_cts.Cancel();
// started
status.Text = "Stopped";
status.ForeColor = System.Drawing.Color.Red;
start.Text = "Start Generating";
}
}
}