如何将调整大小后的图像保存到 ASP.NET 核心应用程序中的 Azure Blob 存储？

Question

我正在使用 ImageSharp 库在将图像上传到 Azure 之前重新缩放图像，应用程序在到达 UploadBlob 操作时挂起且没有错误，我认为这是流导致的它。上传图像时，从图像流中收集信息，我创建一个空 MemoryStream，使用 ImageSharp 调整图像大小，用我新缩放的图像填充 MemoryStream 并尝试上传MemoryStream 到 Azure，我认为它不喜欢它，因为它挂在那里。

在此实例中使用 MemoryStream 是正确的还是其他？

CarController.cs

[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult Create(Car car)
{
    // Define the cancellation token.
    CancellationTokenSource source = new CancellationTokenSource();
    CancellationToken token = source.Token;

    if (ModelState.IsValid)
    {
        //Access the car record
        _carService.InsertCar(car);

        //Get the newly created ID
        int id = car.Id;

        //Give it a name with some virtual directories within the container         
        string fileName = "car/" + id + "/car-image.jpg";
        string strContainerName = "uploads";

        //I create a memory stream ready for the rescaled image, not sure this is right.
        Stream outStream = new MemoryStream();

        //Access my storage account
        BlobServiceClient blobServiceClient = new BlobServiceClient(accessKey);
        BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(strContainerName);

        //Open the image read stream
        var carImage = car.ImageFile.OpenReadStream();

        //Rescale the image, save as jpeg.
        using (Image image = Image.Load(carImage))
        {
            int width = 250;
            int height = 0;
            image.Mutate(x => x.Resize(width, height));                    
            image.SaveAsJpeg(outStream);
        }

        var blobs = containerClient.UploadBlob(fileName, outStream);
        return RedirectToAction(nameof(Index));
    }            
    return View(car);
}

Answer 1

它与 ImageSharp 库没有任何关系。

您需要在保存后重置您的 outStream 位置。 BlobContainerClient 正在尝试从流的末尾读取。

如何将调整大小后的图像保存到 ASP.NET 核心应用程序中的 Azure Blob 存储？

How do I save my resized image to my Azure Blob Storage in my ASP.NET Core Application?

c#

azure-blob-storage

asp.net-core

imagesharp