简单的程序，将图像转换为c＃中的字节数组并显示该数组

Question

here is my program that i have written

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Data;
namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {

            Image img = Image.FromFile("C:\\images.JPG");
            byte[] bArr = imgToByteArray(img);

        }
        public byte[] imgToByteArray(System.Drawing.Image Imagein)
        {
            byte[] data = null;using (System.IO.MemoryStream ms = new MemoryStream())
            {
                Imagein.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                data = ms.ToArray();

            }
            return data;
        }
    }
}

now when i build the program it shows error

an object reference is required for the non static field, method or property 'Program.imgToByteArray(Image)'

Answer 1

The error is pretty clear, you can't access non static methods in a static context (method).

You have two options to fix this issue.

Option 1

Make your function/method a static function.

public static byte[] imgToByteArray(System.Drawing.Image Imagein)
{
   ...
}

Option 2:

Create an instance of Program and access the method.

new Program().imgToByteArray(img);

Since you want to print byte array in console (not sure why?) you could do something like this.

Console.WriteLine(string.Join(",", bytearray);

Answer 2

Make the imgToByteArray method static. There is really no other rational option.

Regarding Option 2 from @Hari Prasad answer you considered an "possible option": You would be creating new class instance to call a member of this instance from a static class member that is the main entry point of the application which is pretty hardcore and given the code design guildelines ie https://msdn.microsoft.com/en-us/library/ms245046.aspx it is something you shouldn't.