将字节数组转换为图像时，参数无效

Question

I want to save images in access database , I used OLE object .

The idea is to convert the image into bytes array , then adding the bytes array in the database.

this is the function :

    public static byte[] ImageToByte(Image img)
    {
        ImageConverter converter = new ImageConverter();
        return (byte[])converter.ConvertTo(img, typeof(byte[]));
    }

this works fine .

When I want to return the bytes array to the image i get an exception :

argument exception was unhandled Parameter is not valid.

I tried two functions to convert the bytes array to the image :

    public static Image ImageFromByte(byte[] image)
    {
        ImageConverter ic = new ImageConverter();
        Image img = (Image)ic.ConvertFrom(image);//here the exception comes
        return img;
    }

OR:

    public static Image ImageFromByte1(byte[] byteArrayIn)
    {
        MemoryStream ms = new MemoryStream(byteArrayIn);
        Image returnImage = Image.FromStream(ms);//here the exception comes
        return returnImage;
    }

What is the problem , how to fix it ?

Answer 1

Try saving the image to disk, and see if that works. Change the filename and extension as you see fit.

Something along these lines:

            string path = @"c:\myimage.jpg";
            using (MemoryStream inputStream = new MemoryStream(byteArrayIn))
            {
                using (Stream file = File.Create(path))
                {
                    byte[] buffer = new byte[8 * 1024];
                    int len;
                    while ((len = inputStream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        file.Write(buffer, 0, len);
                    }
                } 
            }

EDIT: Writing image to disk works, and I guess you can see the image. Try this one:

            using (MemoryStream inputStream = new MemoryStream(byteArrayIn))
            {
                using (var image = Image.FromStream(inputStream))
                {
                    // see if this works.
                    // handle the image as you wish, return it, process it or something else.
                } 
            }