ASP.NET MVC - 將圖像上傳到Amazon S3

Question

我從Request.Files [0]獲得了我的圖像。現在，我該如何將這張圖片上傳到S3？我在AWS .NET API中看到，在放置一個字符串對象時，您必須指定ContentBody。我將如何獲取我的文件的內容正文？

Answer 1

var file = Request.Files[0]; 
PutObjectRequest request = new PutObjectRequest(); 
request.BucketName = "mybucket" 
request.ContentType = contentType; 
request.Key = key; 
request.InputStream = file.InputStream; 
s3Client.PutObject(request); 

Answer 2

很可能這是一個Base64編碼的字符串，但您應該檢查S3文檔以確保它。如果是，則應使用Convert.ToBase64String()並將字節數組傳遞給它。

下面是一些您可以嘗試的示例代碼。我沒有測試它，但它應該可以幫助您正確的觀念：

if (Request.Files.Count >= 1) { 
    var file = Request.Files[0]; 
    var fileContents = new byte[file.ContentLength]; 
    file.InputStream.Read(fileContents, 0, file.ContentLength); 
    var fileBase64String = Convert.ToBase64String(fileContents); 

    // now you can send fileBase64String to the S3 uploader 
} 

Answer 3

與如何使用文件夾和授予所有用戶進行只讀訪問稍微更多的細節。 HTML：

C＃

HttpPostedFileBase file = Request.Files[0]; 
    if (file.ContentLength > 0) // accept the file 
     { 
      string accessKey = "XXXXXXXXXXX"; 
      string secretKey = "122334XXXXXXXXXX"; 
      AmazonS3 client; 
      using (client = Amazon.AWSClientFactory.CreateAmazonS3Client(accessKey, secretKey)) 
      { 
       MemoryStream ms = new MemoryStream(); 
       PutObjectRequest request = new PutObjectRequest(); 
     request.WithBucketName("mybucket") 
    .WithCannedACL(S3CannedACL.PublicRead) 
    .WithKey("testfolder/test.jpg").InputStream = file.InputStream; 
     S3Response response = client.PutObject(request); 
      } 

更多詳細信息，請訪問：http://bradoyler.com/post/3614362044/uploading-an-image-with-aws-sdk-for-net-c

Answer 4

   PurObjectRequest request = new PutObjectRequest() 
       { 
        BucketName = _bucketName, 
        CannedACL = S3CannedACL.PublicRead, 
        Key = string.Format("folderyouwanttoplacethefile/{0}", file.FileName), 
        InputStream = file.InputStream 
       }; 

       YourS3client.PutObject(request);