我在 Azure Blob 存储中存储了一堆图像。现在我想检索它们并调整它们的大小。 我已经成功地从帐户中读取了很多信息,例如文件名、上次修改日期和大小,但是如何获取实际图像?我看到的示例向我展示了如何将其下载到文件中,但这对我没有用,我想将其下载为图像以便进行处理。
这是我目前所拥有的:
BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(containerName);
Console.WriteLine("Listing blobs...");
// build table to hold the info
DataTable table = new DataTable();
table.Columns.Add("ID", typeof(int));
table.Columns.Add("blobItemName", typeof(string));
table.Columns.Add("blobItemLastModified", typeof(DateTime));
table.Columns.Add("blobItemSizeKB", typeof(double));
table.Columns.Add("blobImage", typeof(Image));
// row counter for table
int intRowNo = 0;
// divider to convert Bytes to KB
double dblBytesToKB = 1024.00;
// List all blobs in the container
await foreach (BlobItem blobItem in containerClient.GetBlobsAsync())
{
// increment row number
intRowNo++;
//Console.WriteLine("\t" + blobItem.Name);
// length in bytes
long? longContentLength = blobItem.Properties.ContentLength;
double dblKb = 0;
if (longContentLength.HasValue == true)
{
long longContentLengthValue = longContentLength.Value;
// convert to double DataType
double dblContentLength = Convert.ToDouble(longContentLengthValue);
// Convert to KB
dblKb = dblContentLength / dblBytesToKB;
}
// get the image
// **** Image thisImage = what goes here ?? actual data from blobItem ****
// Last modified date
string date = blobItem.Properties.LastModified.ToString();
try
{
DateTime dateTime = DateTime.Parse(date);
//Console.WriteLine("The specified date is valid: " + dateTime);
table.Rows.Add(intRowNo, blobItem.Name, dateTime, dblKb);
}
catch (FormatException)
{
Console.WriteLine("Unable to parse the specified date");
}
}
答案 0 :(得分:0)
您需要为您的图像打开一个读取流,并从此流构建您的 .NET Image
:
await foreach (BlobItem item in containerClient.GetBlobsAsync()){
var blobClient = containerClient.GetBlobClient(item.Name);
using Stream stream = await blobClient.OpenReadAsync();
Image myImage = Image.FromStream(stream);
//...
}
blobclient 类还公开了一些其他有用的方法,例如下载到流。