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[英]How to download file from amazon s3 using only c#(Without using AWS SDK)
[英]How do I download a file using to the downloads folder with response.WriteResponseStreamToFile? (Amazon S3, C#)
我在S3中存儲了一些PDF,我正在嘗試建立一個鏈接來下載它們。 到目前為止,這是我的方法:
public virtual ActionResult DownloadPDF(string filename)
{
string secretKey = this.UnitOfWork.ApplicationSettingRepository.GetOrCreateByName<string>("StorageProvider_AmazonS3_SecretKey");
string accessKey = this.UnitOfWork.ApplicationSettingRepository.GetOrCreateByName<string>("StorageProvider_AmazonS3_AccessKey");
var bucket = this.UnitOfWork.ApplicationSettingRepository.GetOrCreateByName<string>("StorageProvider_AmazonS3_BucketName");
var serviceUrl = this.UnitOfWork.ApplicationSettingRepository.GetOrCreateByName<string>("StorageProvider_AmazonS3_ServiceUrl");
AmazonS3Config config = new AmazonS3Config();
config.ServiceURL = serviceUrl;
var client = Amazon.AWSClientFactory.CreateAmazonS3Client(
accessKey,
secretKey,
config
);
GetObjectRequest request = new GetObjectRequest();
request.BucketName = bucket;
request.Key = "userfiles/MSD IMAGES/ProductDocumentation/" + filename;
GetObjectResponse response = client.GetObject(request);
response.WriteResponseStreamToFile("\\Downloads\\" + filename);
}
我從這個文檔這種方法在這里 ,但我想下載的下載在瀏覽器中顯示,並進入標准的下載文件夾中。 我之前創建了用於下載csv文件的方法:
var csv = new StringBuilder();
csv.AppendLine("col1,col2,col3");
var bytes = Encoding.UTF8.GetBytes(csv.ToString());
var response = new FileContentResult(bytes, "text/csv");
response.FileDownloadName = fileName;
return response;
我嘗試對S3文件執行相同的操作:
GetObjectResponse response = client.GetObject(request);
// response.WriteResponseStreamToFile("\\Downloads\\" + filename);
var bytes = Encoding.UTF8.GetBytes(response.ToString());
var download = new FileContentResult(bytes, "application/pdf");
download.FileDownloadName = filename;
return download;
它會下載文件,但pdf無法正常工作(無法加載)。 如何下載從S3獲得的文件?
您將需要執行以下操作
int byteCount
byte[] buffer = new byte[2048]; // read in chunks of 2KB
Stream responseStream= Response.GetResponseStream();
Response.ContentType = "application/pdf";
Response.AddHeader("Content-Disposition", "attachment;filename=" + filename);
while ((byteCount = responseStream.Read(buffer, 0, buffer.Length)) > 0)
{
Response.OutputStream.Write(buffer, 0, byteCount);
}
Response.Flush();
Response.Close();
Response.End();
這是我想出的可行解決方案:
GetObjectResponse response = client.GetObject(request);
using (Stream responseStream = response.ResponseStream)
{
var bytes = ReadStream(responseStream);
var download = new FileContentResult(bytes, "application/pdf");
download.FileDownloadName = filename;
return download;
}
public static byte[] ReadStream(Stream responseStream)
{
byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = responseStream.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
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