Question

当我使用Amazon S3 multipart上载文件然后正在加载时，该文件未成功上载。 uploadRequest_UploadPartProgressEvent中的e.PercentDone在protected void Button1_Click(object sender, EventArgs e) { if (FileUpload1.HasFile) { extension = Path.GetExtension(FileUpload1.FileName); fileSize = FileUpload1.PostedFile.ContentLength; Stream st = FileUpload1.PostedFile.InputStream; string name = Path.GetFileName(FileUpload1.FileName); string fName = Path.GetFileNameWithoutExtension(name); string fExt = Path.GetExtension(name); string strRes = String.Concat(fName, builder.ToString()); string strRes1 = String.Concat(strRes, fExt); string s3FileName = @strRes1; stt = st; fileNameInS3 = s3FileName; bool a; TrackMPUAsync().Wait(); } } public async Task TrackMPUAsync() { try { TransferUtility fileTransferUtility = new TransferUtility(s3Client); // Use TransferUtilityUploadRequest to configure options. // In this example we subscribe to an event. TransferUtilityUploadRequest uploadRequest = new TransferUtilityUploadRequest { BucketName = bucketName + @"/" + foldername, Key = filename, InputStream = fileInputStrem }; uploadRequest.UploadProgressEvent += new EventHandler<UploadProgressArgs> (uploadRequest_UploadPartProgressEvent); await fileTransferUtility.UploadAsync(uploadRequest); Console.WriteLine("Upload completed"); } catch (AmazonS3Exception e) { Console.WriteLine("Error encountered on server. Message:'{0}' when writing an object", e.Message); } catch (Exception e) { Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message); } } public void uploadRequest_UploadPartProgressEvent(object sender, UploadProgressArgs e) { // Process event. Console.WriteLine("{0}/{1}", e.TransferredBytes, e.TotalBytes); }为100后面临加载问题，网页正在加载无穷大时间。

const { createArray, getArray } = require ('./function')

window.onload = () => {
    createArray()
    sessionStorage.setItem("Array", getArray)
    console.log(sessionStorage.getItem("Array")   //[object Object],[object Object],[object Object]
    console.log(getArray) // [{"1": 10}, {"2": 11}, {"3": 12}]
}

其他人遇到过这个问题吗？

Answer 1

对于获得可行的解决方案，我有一些建议，但是老实说，我没有运行您的代码（这是基于快速检查代码的结果）。首先，必须将BucketName属性设置为存储桶[1]的确切名称，因此您不应该在其中添加文件夹名称。而是应在Key上将文件夹名称添加为前缀：

BucketName = bucketName,
Key = foldername + @"/" + filename,

接下来，使用Console.WriteLine可能很难看到捕获的错误。看来这是WinForms应用程序的一部分，因此也许使用Debug.WriteLine() [2]在Visual Studio（或代码等）中显示错误是一个好主意。

最后，也许重要的是，在事件处理程序中使用TrackMPUAsync().Wait()是同步的，并且会阻塞直到上传完成[3]，相反，您可能希望异步执行上传：

Task.Run(() => TrackMPUAsync());

希望这会有所帮助。

[1] https://docs.aws.amazon.com/AmazonS3/latest/dev/HLuploadFileDotNet.html

[2] https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.debug.writeline

[3] Prevent winforms UI block when using async/await

分段上传文件中的Amazon S3加载问题

1 个答案: