gistfile1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace TestGVWinAP
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Image img = new Bitmap(@".\pic.jpg");
            List<DataContainer> list = new List<DataContainer>();
            list.Add(new DataContainer { Field1 = "1", Field2 = img, Field3 = "3" });
            list.Add(new DataContainer { Field1 = "A", Field2 = img, Field3 = "C" });
            list.Add(new DataContainer { Field1 = "D", Field2 = img, Field3 = "F" });

            var list2 = from s in list
                        select new { s.Field1, s.Field2 };

            this.dataGridView1.DataSource = list;
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<DataContainer> list = this.dataGridView1.DataSource as List<DataContainer>;
            WebClient client = new WebClient();
            foreach (DataContainer item in list)
            {
                byte[] bytes = client.DownloadData(@"http://cdn-pixiv.maid.tw/thumb/17997136_45953_thumb.jpg");
                Image img = new Bitmap(this.CreateImage(bytes));
                item.Field4=img;
                item.Field1 = "aaa3";
            }
            this.dataGridView1.Refresh();
        }

        private Image CreateImage(byte[] bytes)
        {
            MemoryStream oMemoryStream = new MemoryStream(bytes);
            Image oImage = null;
            Bitmap oBitmap = null;
            oMemoryStream.Position = 0;
            oImage = Image.FromStream(oMemoryStream);
            oBitmap = new Bitmap(oImage);

            return oBitmap;
        }
    }
}