上传blockblob并设置contenttype

Question

我正在使用Microsoft.WindowsAzure.Storage.*C#中的库.

这就是我将内容上传到存储的方式:

// Store in storage
CloudStorageAccount storageAccount = CloudStorageAccount.Parse("...connection string...");
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference("pictures");

// Create container if it doesnt exist
container.CreateIfNotExists();

// Make available to everyone
container.SetPermissions(new BlobContainerPermissions
{
    PublicAccess = BlobContainerPublicAccessType.Blob
});

// Save image
CloudBlockBlob blockBlob = container.GetBlockBlobReference("blah.jpg");
blockBlob.UploadFromByteArray(byteArrayThumbnail, 0, byteArrayThumbnail.Length);
blockBlob.Properties.ContentType = "image/jpg";  // *** NOT WORKING ***

我上传到存储的所有内容都以内容类型"application/octet-stream"保存,即使我使用的值为"image/jpg"的setter(请参阅我的代码中的最后一行).

问题#1:为什么不使用ContentType setter？

问题2:如果我手动将内容类型更改为"image/jpg",使用Windows Azure管理门户,然后将文件的绝对URI复制到浏览器的地址字段,然后按回车键,则会下载jpg文件而不是显示.是不是应该显示这个mime类型而不是下载？我该如何改变？

Answer 1

实际上,您不必调用SetProperties方法.要在上传blob时设置内容类型,只需ContentType在调用upload方法之前设置属性即可.所以你的代码应该是:

// Save image
CloudBlockBlob blockBlob = container.GetBlockBlobReference("blah.jpg");
blockBlob.Properties.ContentType = "image/jpg";
blockBlob.UploadFromByteArray(byteArrayThumbnail, 0, byteArrayThumbnail.Length);

那应该是诀窍.

Answer 2

进行任何更改后Properties,您必须调用CloudBlockBlob.SetProperties()来实际保存这些更改.

将其视为与LINQ-to-Entities类似的东西.您可以对本地对象进行任何更改,但在调用之前SaveChanges(),实际上不会保存任何内容.

Answer 3

使用新的 SDK Azure.Storage.Blobs

BlobHttpHeaders blobHttpHeaders = new BlobHttpHeaders();
blobHttpHeaders.ContentType = "image/jpg";
blobClient.SetHttpHeaders(blobHttpHeaders);

Answer 4

不幸的是，这里提供的答案目前都不适用于最新的 SDK (12.x.+)

使用最新的 SDK，内容类型应通过BlobHttpHeaders.

var _blobServiceClient = new BlobServiceClient("YOURCONNECTIONSTRING");

var containerClient = _blobServiceClient.GetBlobContainerClient("YOURCONTAINERNAME");

var blob = containerClient.GetBlobClient("YOURFILE.png");

var blobHttpHeader = new BlobHttpHeaders();

blobHttpHeader.ContentType = "image/png";

var uploadedBlob = await blob.UploadAsync(YOURSTREAM, blobHttpHeader);