What's the Most Efficient Way to Convert a Bitmap to a Byte Array in C#?

Several ways to efficiently convert C# Bitmap to byte array

Convert Bitmap to byte array. Although the FileStream method is common and easy to understand, the efficiency is not optimal. Here are two more efficient methods:

1. Use ImageConverter:

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

2. Use MemoryStream:

public static byte[] ImageToByte2(Image img)
{
    using (var stream = new MemoryStream())
    {
        img.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
        return stream.ToArray();
    }
}

Comparison of methods:

• ImageConverter: The code is simple and easy to use.
• MemoryStream: Supports custom image formats and saves them directly to memory without disk operation.

Both methods are faster and more efficient than the FileStream method. Which method to choose depends on the needs of the specific application scenario.

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