无法在 C# 中使用 SixLabors.ImageSharp 处理 .jpg 图像 - 版本 1.0.0-beta0007

Question

I am unable to save the jpg image using SixLabors.ImageSharp version - 1.0.0-beta0007 in c#, It throws error. Is there any solution to fix the issue beside GIF,PNG,JPEG,BMP format images.

Throws Exception:

Image cannot be loaded. Available decoders:

• GIF: GifDecoder
• PNG: PngDecoder
• JPEG: JpegDecoder
• BMP: BmpDecoder

Code:

    public string ResizeImage(byte[] imageBytes, int height, int width)
    {
        byte[] image = new byte[] { };

        using (MemoryStream inStream = new MemoryStream(imageBytes))
        {
            using (MemoryStream outStream = new MemoryStream())
            {
                using (Image imageSharp = Image.Load(inStream))
                {
                    imageSharp.Mutate(x => x.Resize(width, height));
                    imageSharp.SaveAsJpeg(outStream);
                    imageSharp.Dispose();
                }

                image = outStream.ToArray();
                outStream.Flush();
                inStream.Flush();
            }
        }
        return Convert.ToBase64String(image);
    }

Answer 1

Make sure the stream position is zero or try to copy the stream to new stream then set the position to zero because sometimes azure blob service close the returned stream

using (MemoryStream stream = new MemoryStream())
using (var ms = new MemoryStream())                                    
await largeBlob.DownloadToAsync(ms);
      ms.Position = 0;
      ms.CopyTo(stream);
      stream.Position = 0;
     var image = Image.Load(stream, out IImageFormat format)

Answer 2

This will be because of a strange thing the AWS does with file uploads you will find the byte[] isn't actually a valid image file (testable by saving the raw byte array out).

This answer from another question should help you reconfigure AWS to allow your code to work.

https://stackoverflow.com/a/56695747/234855

Answer 3

I also came across this issue. The code is shown below.

    byte[] pixelData = new byte[16] { 0, 0 ,0,0,
                                      1,1,1,1,
                                      2,2,2,2,
                                      3,3,3,3};
    Image image = Image.Load(pixelData);
    image.SaveAsBmp("pixelData.bmp");

I don't know how to solve it,either