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目的
早兩天寫了一篇S3簡單上傳檔案的小工具,知乎上看到了一個問題問如何實現顯示MINIO上傳進度,因此擴充一下這個小工具能夠在上傳大檔案時顯示進度。
完整程式碼託管於Github:mrchipset/simple-wpf
實現方式
- 先透過
Xaml
編寫一個包含上傳進度條的小介面。具體內容就不贅述了,可以參考這篇文章 - 為了得到上傳進度就不能再簡單地使用
PutObjectRequest
進行上傳需要使用S3中TransferUtility
提供的高等級API進行上傳。 - 然後建立一個
TransferUtilityUploadRequest
物件並繫結其UploadProgressEvent
事件以實現上傳進度的監控
具體的實現程式碼如下:
private async Task<bool> UploadLargeFileAsync()
{
var credentials = new BasicAWSCredentials(_accessKey, _secretKey);
var clientConfig = new AmazonS3Config
{
ForcePathStyle = true,
ServiceURL = _endpoint,
};
bool ret = true;
using (var client = new AmazonS3Client(credentials, clientConfig))
{
try
{
var fileTransferUtility = new TransferUtility(client);
var uploadRequest = new TransferUtilityUploadRequest
{
BucketName = LargeBucket,
FilePath = UploadLargeFile,
Key = System.IO.Path.GetFileName(UploadLargeFile)
};
uploadRequest.UploadProgressEvent += UploadRequest_UploadProgressEvent;
await fileTransferUtility.UploadAsync(uploadRequest);
}
catch (FileNotFoundException e)
{
ret = false;
this.Dispatcher.Invoke(new Action(() => this.statusLargeTxtBlk.Text = e.Message));
}
catch (AmazonS3Exception e)
{
ret = false;
if (e.ErrorCode != null &&
(e.ErrorCode.Equals("InvalidAccessKeyId") ||
e.ErrorCode.Equals("InvalidSecurity")))
{
this.Dispatcher.Invoke(new Action(() => this.statusLargeTxtBlk.Text = "Please check the provided AWS Credentials"));
}
else
{
this.Dispatcher.Invoke(new Action(() => this.statusLargeTxtBlk.Text = $"An error occurred with the message '{e.Message}' when writing an object"));
}
}
catch(Exception e)
{
this.Dispatcher.Invoke(new Action(() => this.statusLargeTxtBlk.Text = $"An error occurred with the message '{e.Message}' when writing an object"));
}
}
return ret;
}
private void UploadRequest_UploadProgressEvent(object? sender, UploadProgressArgs e)
{
this.Dispatcher.Invoke((Action)(() =>
{
this.uploadProgress.Value = e.TransferredBytes * 100 / e.TotalBytes ;
}));
}
值得一提的時,在上傳進度的事件處理函式中,由於我們透過非同步方法執行上傳函式,因此我們需要使用Dispatcher
來更新資料到UI
上。
演示效果
參考連線
https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpu-upload-object.html
https://www.xtigerkin.com/archives/96/