WebJob方法NotSupportedException将图像保存到Azure Blob存储

Question

I am trying to save a thumbnail from within a WebJob BlobTrigger and I am getting the following Exception:

An exception of type 'System.NotSupportedException' occurred in Microsoft.WindowsAzure.Storage.dll but was not handled in user code Additional information: Specified method is not supported.

I have broken the code down to its simplest elements and still get the exception on bitmap.Save

    public static void CreateThumbnailsForNewlyUploadedPNGs([BlobTrigger("files/{name}.{ext}")] Stream input, [Blob("files/{name}~25.png", FileAccess.Write)] Stream output25, string name, string ext)
    {
        using (var bitmap = new Bitmap(input))
        {
            bitmap.Save(output25, ImageFormat.Png);
        }
    }

Any suggestions what might be going wrong?

Answer 1

I'm not too familiar with webjobs but I looked at the article you mentioned and came up with something. I basically kept it as close to Scotts article as I could. My attribute for the second parameter is BlobOutput instead of Blob.

public static void CreateThumbnailsForNewlyUploadedPNGs(
    [BlobTrigger("files/{name}.{ext}")] Stream input,
    [BlobOutput("files/{name}~25.png")] Stream output,
    string name,
    string ext)
{
    using (var bitmap = new Bitmap(input))
    {
        bitmap.Save(output, ImageFormat.Png);
    }

}