How to Convert Images to Byte Arrays and Back?

Conversion between image and byte array

Question: How to convert an image to a byte array, and how to convert a byte array back to an image?

Answer:

To convert an image to a byte array, you can use the following sample code:

<code class="language-csharp">public byte[] ImageToByteArray(System.Drawing.Image imageIn)
{
    using (var ms = new MemoryStream())
    {
        imageIn.Save(ms, imageIn.RawFormat);
        return ms.ToArray();
    }
}</code>

This code uses MemoryStream to store the image and then converts it to a byte array.

To convert the byte array back to an image, you can also use a class like this:

<code class="language-csharp">public class ImageConverter
{
    public ImageConverter() { }

    public Image ByteToImage(byte[] byteArrayIn)
    {
        using (var ms = new MemoryStream(byteArrayIn))
        {
            Image returnImage = Image.FromStream(ms);
            return returnImage;
        }
    }

    public byte[] ImageToByte(Image imageIn)
    {
        using (var ms = new MemoryStream())
        {
            imageIn.Save(ms, ImageFormat.Png); // 指定保存格式为PNG
            return ms.ToArray();
        }
    }
}</code>

This code provides a more structured way to perform conversion between images and byte arrays, and explicitly specifies the format in which the image is saved as PNG. You can modify ImageFormat to choose a different format, such as JPEG or GIF, if needed.

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