C＃位图无效参数

Question

Here is what I am trying to do: Take a folder full of images, perform an optimization on them, and store them in the same file.

I get the error:

System.ArgumentException
  Message = Parameter is not valid.

From line:

using (var bitmap = new Bitmap(image))

I think this has something to do with the file being open, and blocking access but I'm not sure. I know for a fact that the filepath I'm using is correct, and that it is a folder filled with images. Can anyone help me?

 string[] folder = Directory.GetFiles(GetSourceDirectory());

        Parallel.ForEach(folder, (file) =>
        {
            using (var fileStream = File.Open(file, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
            {
                var image = fileStream.Name;
                Console.WriteLine(image);
                Console.ReadLine();
                using (var bitmap = new Bitmap(image))
                {
                    using (var quantized = quantizer.QuantizeImage(bitmap, 1, 1))
                    {
                        var blob = container.GetBlockBlobReference(fileStream.Name);
                        try
                        {
                            quantized.Save(fileStream, ImageFormat.Png);
                        }
                        catch (ArgumentException e)
                        {
                            Console.WriteLine(e.Message);
                            Console.ReadLine();
                            Console.WriteLine();
                            throw;
                        }

                        blob.UploadFromStreamAsync(fileStream).Wait();

                    }
                }
            }
        });

Answer 1

This is because you are using the filestream to read and write at the same time.

If you change the File.Open to

using (var fileStream = File.Open(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))

it will allow you to do

using (var bitmap = new Bitmap(image))

But then obviously you will come unstuck later when you try to write using the fileStream variable.

So I think you will have to change it so you don't have the nested using statements.

Answer 2

FileStream.Name仅提供文件名，例如“ image.jpg”，您是否尝试过使用（var bitmap = new Bitmap（fileStream）） ？